""ET TROJAN Mermaid Ransomware Variant CnC Activity M3""

SID: 2029321

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_01_24, deployment Perimeter, signature_severity Major, tag Ransomware, updated_at 2020_01_24, 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: "GET"

• Value: ".php?"

• Value: "=ID:_"

• Value: "Key|3a|"

• Value: !"Referer"

• Value: !"User-Agent"

Within:

PCRE: "/^Host\x3a\x20[^\r\n]+\r\nConnection\x3a\x20Keep-Alive\r\n$/H"

Special Options:

• http_method

• http_uri

• http_uri

• http_uri

• fast_pattern

• http_header

• http_header

source