""ET TROJAN CHAOS RAT/AlfaC2 Client Checkin""

SID: 2046872

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_and_Server, created_at 2023_07_20, deployment Perimeter, malware_family CHAOS, performance_impact Low, confidence High, signature_severity Critical, tag RemoteAccessTool, updated_at 2023_11_27

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "/client"

  • Value: "Upgrade|3a 20|websocket|0d 0a|"

  • Value: "X-Client|3a 20|"

  • Value: "User-Agent|3a 20|Go-http-client/"

  • Value: "jwt=" Depth: 4

  • Value: ".eyJhdXRob3JpemVkIj"

  • Value: !"|3b|"

Within:

PCRE: "/X-Client\x3a\x20(?:[a-f0-9]{2}\x3a){5}[a-f0-9]{2}[\r\n]+$/Hm"

Special Options:

  • http_uri

  • http_header

  • http_header

  • fast_pattern

  • http_header

  • http_cookie

  • http_cookie

  • http_cookie

source