""ET TROJAN Cobalt Strike Malleable C2 Profile (bg)""

SID: 2032966

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_05_17, deployment Perimeter, malware_family Cobalt_Strike, malware_family Cobalt_Strike, signature_severity Major, updated_at 2021_05_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation

Reference:

  • md5

  • 5b5a730628dc9eba2c12530d225c2f70

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "Cookie|3a 20|SSID="

  • Value: "GET"

  • Value: "/bg"

  • Value: "SSID=" Depth: 5

Within:

PCRE: "/^SSID=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/C"

Special Options:

  • http_method

  • http_uri

  • http_cookie

source