""ET TROJAN Cobalt Strike Activity (GET)""

SID: 2033821

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2021_08_27, deployment Perimeter, malware_family Cobalt_Strike, signature_severity Major, updated_at 2021_08_27, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation

Reference:

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: "/image-directory/fam_newspaper.ico"

  • Value: "Connection|3a 20|Close|0d 0a|"

  • Value: "Connection|3a 20|Close|0d 0a|"

  • Value: !"Referer|3a 20|"

Within:

PCRE:

Special Options:

  • http_method

  • fast_pattern

  • http_uri

  • http_header

  • http_header

  • http_header

source