""ET TROJAN Win32/Cryptbotv2 CnC Activity (POST) M1""

SID: 2038918

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2022_09_21, deployment Perimeter, malware_family Cryptbot, signature_severity Major, updated_at 2023_04_27

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: ".php"

  • Value: "form-data|3b 20|name=|22|files|5b 5d 22 3b 20|"

  • Value: !"Referer|3a 20|"

Within:

PCRE: "/^Content-Type\x3a\x20[^\r\n]+\r\nUser-Agent\x3a\x20[^\r\n]+\r\nHost\x3a\x20[^\r\n]+\r\n/Hm"

Special Options:

  • http_method

  • http_uri

  • http_client_body

  • http_header

source