""ET TROJAN Backdoor.Elise CnC Beacon 2""

SID: 2021276

Revision: 4

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2015_06_16, deployment Perimeter, performance_impact Significant, signature_severity Major, tag c2, updated_at 2024_04_29, 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: $HTTP_PORTS

Flow: to_server,established

Contents:

  • Value: "POST"

  • Value: ".html"

  • Value: !"Content-Type|3a|"

  • Value: !"Accept-"

  • Value: !"Referer|3a|"

  • Value: "Content-Length|3a 20|0|0d 0a|"

  • Value: !"Host|3 a20|www.youdao.com"

Within:

PCRE: "/\/\d{8,10}.html$/Ui"

Special Options:

  • http_method

  • nocase

  • http_uri

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

source