""ET TROJAN Nim Based Downloader Activity (GET)""

SID: 2036733

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2022_05_31, deployment Perimeter, deployment SSLDecrypt, signature_severity Major, updated_at 2022_05_31

Reference:

  • md5

  • bf80b998a00cbb3705e23c3314498d61

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: "/version"

  • Value: "Save-Data|3a 20|"

  • Value: "User-Agent|3a 20|Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)|0d 0a|"

Within:

PCRE: "/\r\nUser-Agent[^\r\n]+\r\nSave-Data[^\r\n]+\r\nHost[^\r\n]+\r\n\r\n$/Hm"

Special Options:

  • http_method

  • http_uri

  • http_header

  • fast_pattern

  • http_header

source