""ET TROJAN Downeks Variant CnC Beacon""

SID: 2023811

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_01_31, deployment Perimeter, malware_family DustSky_related_Implant, signature_severity Major, tag c2, updated_at 2017_01_31, 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: established,to_server

Contents:

  • Value: "POST"

  • Value: !"."

  • Value: !"?"

  • Value: !"="

  • Value: !"User-Agent|3a|"

  • Value: !"Accept"

  • Value: !"Referer|3a|"

  • Value: "Content-Type|3a 20|text/plain|3b|charset=UTF-8|0d 0a|Host|3a 20|" Depth: 46

  • Value: "Expect|3a 20|100-continue|0d 0a|"

Within:

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

Special Options:

  • http_method

  • http_uri

  • http_uri

  • http_uri

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

source