""ET TROJAN APT28 SEDNIT Variant CnC Beacon 3""

SID: 2023914

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2016_06_09, deployment Perimeter, signature_severity Major, tag c2, updated_at 2016_06_09, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

• md5

• c2988e3e4f70d5901b234ff1c1363dcc

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: ".htm/?"

• Value: !"Content-Type|3a|"

• Value: !"Accept"

• Value: !"Referer|3a|"

Within:

PCRE: "/.htm\/\?[A-Za-z0-9]+=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/U"

Special Options:

• http_method

• http_uri

• http_header

• http_header

• http_header

source