command_and_control_screenconnect_childproc.toml

[metadata]
creation_date = "2024/03/27"
integration = ["endpoint", "windows", "sentinel_one_cloud_funnel", "m365_defender"]
maturity = "production"
min_stack_comments = "Breaking change at 8.13.0 for SentinelOne Integration."
min_stack_version = "8.13.0"
updated_date = "2024/08/07"

[rule]
author = ["Elastic"]
description = """
Identifies suspicious processes being spawned by the ScreenConnect client processes. This activity may indicate execution
abusing unauthorized access to the ScreenConnect remote access software.
"""
from = "now-9m"
index = ["logs-endpoint.events.process-*", "winlogbeat-*", "logs-windows.sysmon_operational-*", "logs-system.security*", "endgame-*", "logs-sentinel_one_cloud_funnel.*", "logs-m365_defender.event-*"]
language = "eql"
license = "Elastic License v2"
name = "Suspicious ScreenConnect Client Child Process"
references = ["https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708"]
risk_score = 47
rule_id = "78de1aeb-5225-4067-b8cc-f4a1de8a8546"
severity = "medium"
tags = [
    "Domain: Endpoint",
    "OS: Windows",
    "Use Case: Threat Detection",
    "Tactic: Command and Control",
    "Resources: Investigation Guide",
    "Data Source: Elastic Endgame",
    "Data Source: Elastic Defend",
    "Data Source: Sysmon",
    "Data Source: SentinelOne",
    "Data Source: Microsoft Defender for Endpoint",
    "Data Source: System",
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where host.os.type == "windows" and event.type == "start" and
  process.parent.name :
                ("ScreenConnect.ClientService.exe",
                 "ScreenConnect.WindowsClient.exe",
                 "ScreenConnect.WindowsBackstageShell.exe",
                 "ScreenConnect.WindowsFileManager.exe") and
  (
   (process.name : "powershell.exe" and
    process.args : ("-enc", "-ec", "-e", "*downloadstring*", "*Reflection.Assembly*", "*http*")) or
   (process.name : "cmd.exe" and process.args : "/c") or
   (process.name : "net.exe" and process.args : "/add") or
   (process.name : "schtasks.exe" and process.args : ("/create", "-create")) or
   (process.name : "sc.exe" and process.args : "create") or
   (process.name : "rundll32.exe" and not process.args : "url.dll,FileProtocolHandler") or
   (process.name : "msiexec.exe" and process.args : ("/i", "-i") and
    process.args : ("/q", "/quiet", "/qn", "-q", "-quiet", "-qn", "-Q+")) or
   process.name : ("mshta.exe", "certutil.exe", "bistadmin.exe", "certreq.exe", "wscript.exe", "cscript.exe", "curl.exe",
                   "ssh.exe", "scp.exe", "wevtutil.exe", "wget.exe", "wmic.exe")
   )
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1219"
name = "Remote Access Software"
reference = "https://attack.mitre.org/techniques/T1219/"


[rule.threat.tactic]
id = "TA0011"
name = "Command and Control"
reference = "https://attack.mitre.org/tactics/TA0011/"