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

SID: 2036824

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 2022_06_02, deployment Perimeter, malware_family Cobalt_Strike, signature_severity Major, updated_at 2022_06_02, 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: "/users/" Depth: 7

  • Value: "/endpoints/events/poll"

  • Value: "|0d 0a|Authentication|3a 20|skypetoken=eyJhbGciOi"

  • Value: "|0d 0a|x-ms-session-id|3a 20|f73c3186-057a-d996-3b63-"

  • Value: "Accept|3a 20|json|0d 0a|"

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

Within:

PCRE: "/\/endpoints\/events\/poll$/U"

Special Options:

  • http_method

  • http_uri

  • http_uri

  • http_header

  • fast_pattern

  • http_header

  • http_header

  • http_header

source