""ET TROJAN Mermaid Ransomware Variant CnC Activity M4""

SID: 2029496

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_19, deployment Perimeter, signature_severity Major, tag Ransomware, updated_at 2020_02_19, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact

Reference:

  • md5

  • fc78e6e58352151fb77a4b92f239d381

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "GET"

  • Value: "=ID|3a 20|"

  • Value: "|20 20|Key1|3a 20 20|"

  • Value: "|20 20|Key2|3a 20 20|"

  • Value: "User-Agent|3a 20|Mozilla/3.0 (compatible|3b 20|Indy Library)"

  • Value: !"Referer|3a 20|"

Within:

PCRE:

Special Options:

  • http_method

  • http_uri

  • http_uri

  • http_uri

  • fast_pattern

  • http_header

  • http_header

source