""ET TROJAN [eSentire] Win32/GandCrab v4/5 Ransomware CnC Activity""

SID: 2025638

Revision: 4

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_07_04, deployment Perimeter, malware_family GandCrab, signature_severity Major, tag Ransomware, updated_at 2018_09_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: "POST"

• Value: "Content-Type|3a 20|multipart/form-data"

• Value: "User-Agent|3a 20|Mozilla/5.0 (Windows NT 6.1|3b 20|WOW64"

• Value: "wfKD6iudumBkmp" Depth: 14

• Value: !"Referer|3a|"

• Value: !"Accept"

Within:

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

Special Options:

• http_method

• http_header

• http_header

• fast_pattern

• http_client_body

• http_header

• http_header

source