""ET TROJAN Backdoor.Elise CnC Beacon 1 M2""

SID: 2021275

Revision: 4

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2015_06_16, deployment Perimeter, signature_severity Major, tag c2, updated_at 2015_06_23, 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: "GET"

  • Value: "/" Depth: 1 Offset: 9

  • Value: ".html"

  • Value: !"Accept-"

  • Value: !"Referer|3a|"

  • Value: "A=" Depth: 2

  • Value: "Cookie|3a 20|A="

Within:

PCRE: "/^\/[a-f0-9]{8}\/\D+\d{8,10}.html$/Ui"

Special Options:

  • http_method

  • http_uri

  • nocase

  • http_uri

  • http_header

  • http_header

  • http_cookie

source