""ET TROJAN Backdoor.Elise CnC Beacon 1 M1""

SID: 2021274

Revision: 3

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_19, 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: "/page_"

  • Value: ".html"

  • Value: !"Accept-"

  • Value: !"Referer|3a|"

  • Value: "User-Agent|3a| Mozilla/4.0 (compatible|3b| MSIE 8.0"

Within:

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

Special Options:

  • http_method

  • nocase

  • http_uri

  • nocase

  • http_uri

  • http_header

  • http_header

  • http_header

source