""ET TROJAN Cobalt Strike Malleable C2 (Custom)""

SID: 2029977

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 2020_04_20, deployment Perimeter, malware_family Cobalt_Strike, signature_severity Major, updated_at 2020_04_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation

Reference:

  • md5

  • 79bbe1365fb7532613823ce3e0cac499

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: "/api/3.1/query?style=" Depth: 21

  • Value: "Referer|3a 20|https://www.google.com|0d 0a|Accept|3a 20|/|0d 0a|Content-Type|3a 20|application/x-www-form-urlencoded|0d 0a|Content-Transfer-Encoding|3a 20|base64|0d 0a|"

Within:

PCRE: "/^\/api\/3.1\/query\?style=[a-z]{256}$/U"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

source