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# Test Description | ||
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Test earlier alert matches after trigger raw stream reassembly when there's a | ||
completed DNS TCP transaction. | ||
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## PCAP | ||
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dns-tcp-multi.pcap, crafted for this test, shared in the Redmine ticket. | ||
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## Behavior | ||
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The capture shows three request-response DNS transactions: | ||
Query 1: suricata.io | ||
Query 2: oisf.net | ||
Query 3: suricata.org | ||
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We match those against a single payload rule without any DNS keywords, | ||
and inspecting content `suricata|02|`. Ideally, the expectation is to have 2 alerts, | ||
for the portion of the stream associated with Query 1 - that's because on the | ||
wire we observe that for Query three the content is `suricata|03|`. | ||
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## Related issues | ||
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https://redmine.openinfosecfoundation.org/issues/7004 | ||
https://redmine.openinfosecfoundation.org/issues/7018 |
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# This rule will only match on the first DNS transaction that contains | ||
# `suricata`, as the second is followed by |03| | ||
alert dns any any -> any any (msg:"DNS suricata query - payload rule"; content:"suricata|02|"; sid:1; rev:1;) |
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args: | ||
- -k none | ||
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pcap: ../bug-7004-ids-dns-keywords/input.pcap | ||
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checks: | ||
- filter: | ||
min-version: 7 | ||
count: 2 | ||
match: | ||
event_type: alert | ||
- filter: | ||
min-version: 8 | ||
count: 1 | ||
match: | ||
event_type: alert | ||
pcap_cnt: 7 | ||
alert.signature: DNS suricata query - payload rule | ||
alert.signature_id: 1 | ||
proto: TCP | ||
src_ip: 10.16.1.11 | ||
src_port: 36926 | ||
app_proto: dns | ||
dest_ip: 9.9.9.9 | ||
dest_port: 53 | ||
direction: to_server | ||
- filter: | ||
min-version: 8 | ||
count: 1 | ||
match: | ||
event_type: alert | ||
pcap_cnt: 9 | ||
alert.signature: DNS suricata query - payload rule | ||
alert.signature_id: 1 | ||
app_proto: dns | ||
proto: TCP | ||
src_ip: 9.9.9.9 | ||
src_port: 53 | ||
dest_ip: 10.16.1.11 | ||
dest_port: 36926 | ||
direction: to_client | ||
- filter: | ||
count: 1 | ||
match: | ||
event_type: dns | ||
pcap_cnt: 5 | ||
dest_ip: 9.9.9.9 | ||
dest_port: 53 | ||
dns.id: 0 | ||
dns.opcode: 0 | ||
dns.rrname: suricata.io | ||
dns.rrtype: A | ||
dns.tx_id: 0 | ||
dns.type: query | ||
proto: TCP | ||
src_ip: 10.16.1.11 | ||
src_port: 36926 | ||
- filter: | ||
count: 1 | ||
match: | ||
event_type: dns | ||
pcap_cnt: 7 | ||
proto: TCP | ||
src_ip: 10.16.1.11 | ||
src_port: 36926 | ||
dest_ip: 9.9.9.9 | ||
dest_port: 53 | ||
dns.answers[0].rdata: 35.212.0.44 | ||
dns.answers[0].rrname: suricata.io | ||
dns.answers[0].rrtype: A | ||
dns.answers[0].ttl: 490 | ||
dns.flags: '8180' | ||
dns.grouped.A[0]: 35.212.0.44 | ||
dns.id: 0 | ||
dns.opcode: 0 | ||
dns.qr: true | ||
dns.ra: true | ||
dns.rcode: NOERROR | ||
dns.rd: true | ||
dns.rrname: suricata.io | ||
dns.rrtype: A | ||
dns.type: answer | ||
dns.version: 2 | ||
- filter: | ||
count: 1 | ||
match: | ||
event_type: dns | ||
pcap_cnt: 9 | ||
proto: TCP | ||
src_ip: 10.16.1.11 | ||
src_port: 36926 | ||
dest_ip: 9.9.9.9 | ||
dest_port: 53 | ||
dns.id: 0 | ||
dns.opcode: 0 | ||
dns.rrname: oisf.net | ||
dns.rrtype: A | ||
dns.tx_id: 2 | ||
dns.type: query | ||
- filter: | ||
count: 1 | ||
match: | ||
event_type: dns | ||
pcap_cnt: 10 | ||
proto: TCP | ||
src_ip: 10.16.1.11 | ||
src_port: 36926 | ||
dest_ip: 9.9.9.9 | ||
dest_port: 53 | ||
dns.answers[0].rdata: 192.0.78.190 | ||
dns.answers[0].rrname: oisf.net | ||
dns.answers[0].rrtype: A | ||
dns.answers[0].ttl: 207 | ||
dns.answers[1].rdata: 192.0.78.209 | ||
dns.answers[1].rrname: oisf.net | ||
dns.answers[1].rrtype: A | ||
dns.answers[1].ttl: 207 | ||
dns.flags: '8180' | ||
dns.grouped.A[0]: 192.0.78.190 | ||
dns.grouped.A[1]: 192.0.78.209 | ||
dns.id: 0 | ||
dns.opcode: 0 | ||
dns.qr: true | ||
dns.ra: true | ||
dns.rcode: NOERROR | ||
dns.rd: true | ||
dns.rrname: oisf.net | ||
dns.rrtype: A | ||
dns.type: answer | ||
dns.version: 2 | ||
- filter: | ||
count: 1 | ||
match: | ||
event_type: dns | ||
pcap_cnt: 11 | ||
proto: TCP | ||
src_ip: 10.16.1.11 | ||
src_port: 36926 | ||
dest_ip: 9.9.9.9 | ||
dest_port: 53 | ||
dns.id: 0 | ||
dns.opcode: 0 | ||
dns.rrname: suricata.org | ||
dns.rrtype: A | ||
dns.tx_id: 4 | ||
dns.type: query | ||
- filter: | ||
count: 1 | ||
match: | ||
event_type: dns | ||
pcap_cnt: 12 | ||
proto: TCP | ||
src_ip: 10.16.1.11 | ||
src_port: 36926 | ||
dest_ip: 9.9.9.9 | ||
dest_port: 53 | ||
dns.answers[0].rdata: 15.197.148.33 | ||
dns.answers[0].rrname: suricata.org | ||
dns.answers[0].rrtype: A | ||
dns.answers[0].ttl: 600 | ||
dns.answers[1].rdata: 3.33.130.190 | ||
dns.answers[1].rrname: suricata.org | ||
dns.answers[1].rrtype: A | ||
dns.answers[1].ttl: 600 | ||
dns.flags: '8180' | ||
dns.grouped.A[0]: 15.197.148.33 | ||
dns.grouped.A[1]: 3.33.130.190 | ||
dns.id: 0 | ||
dns.opcode: 0 | ||
dns.qr: true | ||
dns.ra: true | ||
dns.rcode: NOERROR | ||
dns.rd: true | ||
dns.rrname: suricata.org | ||
dns.rrtype: A | ||
dns.type: answer | ||
dns.version: 2 | ||
- filter: | ||
count: 1 | ||
match: | ||
event_type: flow | ||
app_proto: dns | ||
proto: TCP | ||
src_ip: 10.16.1.11 | ||
src_port: 36926 | ||
dest_ip: 9.9.9.9 | ||
dest_port: 53 | ||
flow.age: 0 | ||
flow.alerted: true | ||
flow.bytes_toclient: 575 | ||
flow.bytes_toserver: 627 | ||
flow.pkts_toclient: 6 | ||
flow.pkts_toserver: 8 | ||
flow.reason: shutdown | ||
flow.state: closed | ||
tcp.ack: true | ||
tcp.fin: true | ||
tcp.psh: true | ||
tcp.state: closed | ||
tcp.syn: true | ||
tcp.tc_max_regions: 1 | ||
tcp.tcp_flags: 1b | ||
tcp.tcp_flags_tc: 1b | ||
tcp.tcp_flags_ts: 1b | ||
tcp.ts_max_regions: 1 |
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@@ -0,0 +1,28 @@ | ||
# Test Description | ||
|
||
Test earlier alert matches after trigger raw stream reassembly when there's a | ||
completed DNS TCP transaction. | ||
|
||
## PCAP | ||
|
||
dns-tcp-multi.pcap, crafted for this test, shared in the Redmine ticket. | ||
|
||
The capture shows three request-response DNS transactions: | ||
Query 1: suricata.io | ||
Query 2: oisf.net | ||
Query 3: suricata.org | ||
|
||
## Behavior | ||
|
||
We match those against a single payload rule without any DNS keywords, | ||
and inspecting content `suricata|02|`. Ideally, the expectation is to have 2 alerts, | ||
for the portion of the stream associated with Query 1 - that's because on the | ||
wire we observe that for Query three the content is `suricata|03|`. | ||
|
||
For IPS mode, as a larger portion of the stream buffer is kept available, and as | ||
it still contains the matching bytes, we'll see more alerts triggered. | ||
|
||
## Related issues | ||
|
||
https://redmine.openinfosecfoundation.org/issues/7004 | ||
https://redmine.openinfosecfoundation.org/issues/7018 |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,3 @@ | ||
# This rule will only match on the first DNS transaction that contains | ||
# `suricata`, as the second is followed by |03| | ||
alert dns any any -> any any (msg:"DNS suricata query - payload rule"; content:"suricata|02|"; sid:1; rev:1;) |
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