""ET TROJAN TA577 Style Request (2023-05-15)""

SID: 2048249

Revision: 3

Class Type: trojan-activity

Metadata: attack_target Client_and_Server, created_at 2023_09_26, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag TA577, updated_at 2023_12_13, reviewed_at 2023_09_26

Reference:

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: "/" Depth: 1

  • Value: "/?4" Depth: 5 Offset: 3

  • Value: !"|2e|"

  • Value: !"&"

  • Value: !"Referer|3a 20|"

  • Value: !"ebby.com|0d 0a|"

  • Value: !"attsuppliers.com|0d 0a|"

  • Value: !"rittal.com|0d 0a|"

Within:

PCRE: "/^\/(?!(?:h(?:elp|tml)|a(?:ch|ds)|blog|goto|item|site|user|en))(?:[A-IL-VX]{2,4}|[a-il-vx]{2,4})\/\?4[0-9]{4,7}$/U"

Special Options:

  • http_method

  • http_uri

  • http_uri

  • fast_pattern

  • http_uri

  • http_uri

  • http_header

  • nocase

  • http_header

  • http_header

  • http_header

source