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

SID: 2032956

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2021_05_13, deployment Perimeter, malware_family Cobalt_Strike, signature_severity Major, updated_at 2021_05_13, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation

Reference:

• md5

• efb5212c17a7cd05e087ef7a5655b4aa

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

• Value: "GET"

• Value: "/fam_newspaper" Depth: 14

• Value: "User-Agent|3a 20|Mozilla/5.0 (Linux|3b 20|Android 8.0.0|3b 20|SM-G960F Build/R16NW) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202|0d 0a|"

• Value: "wordpress_logged_in=" Depth: 20

• Value: "Accept|3a 20|image/*|0d 0a|"

Within:

PCRE: "/^wordpress_logged_in=(?:[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_header

• http_cookie

• http_header

source