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

SID: 2052312

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_04_30, deployment Perimeter, malware_family Cobalt_Strike, confidence High, signature_severity Major, updated_at 2024_04_30, 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: "User-Agent|3a 20|Mozilla|2f|5|2e|0|20 28|compatible|3b 20|MSIE|20|10|2e|0|3b 20|Windows|20|NT|20|6|2e|2|3b 20|WOW64|3b 20|Trident|2f|6|2e|0|3b 20|MALNJS|29 0d 0a|"

  • Value: "Keep-Alive"

  • Value: !"Referer|3a 20|"

Within:

PCRE: "/^Connection\x3a\x20[^\r\n]+Keep-Alive/Hmi"

Special Options:

  • http_method

  • http_header

  • http_header

  • http_header

source