""ET TROJAN NCSC XAgent Beacon""

SID: 2026437

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2018_10_04, deployment Perimeter, signature_severity Major, tag c2, updated_at 2018_10_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: any

Flow: established,to_server

Contents:

  • Value: "HTTP/1.1|0d 0a|Accept|3a|text/html,application/xhtml+xml,application/xml|3b|q=0.9,*"

  • Value: !"Host|3a| yandex.ru"

Within:

PCRE: "/^(?:GET|POST)\/(?:watch|search|find|results|open|search|close)\/\?(?:text=|from=|aq=|ai=|ags=|oe=|btnG=|oprnd=|utm=|channel=|itwm=)/"

Special Options:

source