""ET POLICY IRC Channel JOIN on non-standard port""
SID: 2000348
Revision: 18
Class Type: unusual-client-port-connection
Metadata: attack_target Client_and_Server, created_at 2010_07_30, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Informational, updated_at 2023_05_09, reviewed_at 2024_05_01
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: ![25,587,6666:7000,8076]
Flow: established,to_server
Contents:
- Value: "JOIN " Depth: 5
Within:
PCRE: "/&|#|+|!/R"
Special Options:
- nocase