""ET TROJAN Cobalt Strike Malleable C2 Profile (Teams) M1""

SID: 2032975

Revision: 1

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_18, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, signature_severity Major, updated_at 2021_05_18, 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: "/Collector/2.0/settings/" Depth: 24

  • Value: "events="

  • Value: "Accept|3a 20|json|0d 0a|"

  • Value: "Referer|3a 20|https://teams.microsoft.com/_|0d 0a|"

Within:

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

Special Options:

  • http_method

  • fast_pattern

  • http_uri

  • http_uri

  • http_header

  • http_header

source