""ET TROJAN Ransomware Locky CnC Beacon 4 21 May""

SID: 2022844

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2016_05_31, deployment Perimeter, signature_severity Major, tag c2, updated_at 2016_05_31, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

  • md5

  • 53859b74ab0ed0e98065982462f4e575

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: "/access.cgi"

  • Value: !"Referer|3a|"

  • Value: "www-form-urlencoded|0d 0a|"

  • Value: !"Accept"

  • Value: "User-Agent|3a|"

Within:

PCRE: "/[\x80-\xff]/P"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_header

  • http_header

  • http_header

source