stream/rules: add example rule for pkt_spurious_retransmission

3 years ago · d8edea904c
parent cc4e8f0936
commit d8edea904c
1 changed files with 5 additions and 1 deletions
--- a/rules/stream-events.rules
+++ b/rules/stream-events.rules
@ -94,5 +94,9 @@ alert tcp any any -> any any (msg:"SURICATA STREAM pkt seen on wrong thread"; st
 # Packet with FIN+SYN set
 alert tcp any any -> any any (msg:"SURICATA STREAM FIN SYN reuse"; stream-event:fin_syn; classtype:protocol-command-decode; sid:2210060; rev:1;)

-# next sid 2210061
+# Packet is a spurious retransmission, so a retransmission of already ACK'd data.
+# Disabled by default as this quite common and not malicious.
+#alert tcp any any -> any any (msg:"SURICATA STREAM spurious retransmission"; stream-event:pkt_spurious_retransmission; classtype:protocol-command-decode; sid:2210061; rev:1;)
+
+# next sid 2210062