""ET TROJAN Win32/CHIP Ransomware CnC Checkin""

SID: 2023534

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2016_03_07, deployment Perimeter, signature_severity Major, tag Ransomware, updated_at 2016_11_18, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact

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: ".php"

  • Value: "Content-Type|3a| application/x-www-form-urlencoded"

  • Value: !"Accept"

  • Value: !"Referer|3a|"

  • Value: "-----BEGIN CERTIFICATE-----" Depth: 27

  • Value: "-----END CERTIFICATE-----"

Within:

PCRE: "/^Host\x3a\s*?\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}(?:\x3a|\r?\n)/Hmi"

Special Options:

  • http_method

  • http_uri

  • http_header

  • http_header

  • http_header

  • fast_pattern

  • http_client_body

  • http_client_body

source