""ET TROJAN W32/DirCrypt.Ransomware CnC Checkin""

SID: 2017308

Revision: 5

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2013_08_12, deployment Perimeter, signature_severity Major, tag Ransomware, updated_at 2015_09_29, 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-Disposition|3A| form-data|3B| name=|22|cmd|22|"

  • Value: "Content-Disposition|3A| form-data|3B| name=|22|botid|22|"

  • Value: "Content-Disposition|3A| form-data|3B| name=|22|lid|22|"

Within:

PCRE:

Special Options:

  • http_method

  • http_client_body

  • http_client_body

  • http_client_body

source