""ET TROJAN W32/Citadel.Arx Variant CnC Beacon 1""
SID: 2017690
Revision: 1
Class Type: trojan-activity
Metadata: attack_target Client_Endpoint, created_at 2013_11_07, deployment Perimeter, signature_severity Major, tag c2, updated_at 2013_11_07, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: $HTTP_PORTS
Flow: established,to_server
Contents:
-
Value: "/rssfeed.php?a="
-
Value: !"Referer|3a|"
Within:
PCRE: "/rssfeed.php\?a=[^&]+?&\d+$/U"
Special Options:
-
http_uri
-
http_header