""ET TROJAN Win32/Unk Downloader CnC Activity""

SID: 2032342

Revision: 3

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_03_29, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, signature_severity Major, updated_at 2021_04_19

Reference:

  • md5

  • 1743533d63a8ba25142ffa3efc59b50b

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "GET /" Depth: 5

  • Value: "image.php?id="

  • Value: "Content-Type|3a 20|application/x-www-form-urlencoded|0d 0a|"

  • Value: !"Referer|3a 20|"

  • Value: !"User-Agent|3a 20|"

Within:

PCRE: "/^[0-9A-F]{21,22}\x20HTTP\/1.1$/R"

Special Options:

  • fast_pattern

  • http_header

  • http_header

  • http_header

source