""ET TROJAN CNRarypt Ransomware CnC Activity""

SID: 2033075

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_06_03, deployment Perimeter, signature_severity Major, tag Ransomware, updated_at 2021_06_03, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact

Reference:

  • md5

  • 62292df897bf304872aad2dc92c96d70

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: "/HOW_TO_BACK_YOUR_FILES.txt"

  • Value: "User-Agent|3a 20|CertUtil URL Agent|0d 0a|"

  • Value: !"Referer|3a 20|"

Within:

PCRE: "/\/HOW_TO_BACK_YOUR_FILES.txt$/U"

Special Options:

  • http_method

  • fast_pattern

  • http_uri

  • http_header

  • http_header

source