""ET TROJAN Win32/Vidar Variant/Mars CnC Activity (GET)""

SID: 2036667

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_05_23, deployment Perimeter, signature_severity Major, updated_at 2022_05_24

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "|0d 0a|Cache-Control|3a 20|no-cache|0d 0a|"

  • Value: "PHPSESSID=" Depth: 10

  • Value: !"Referer"

  • Value: !"User-agent"

  • Value: "GET /request HTTP/1.1" Depth: 21

Within:

PCRE: "/^PHPSESSID=[a-z0-9]{26}$/C"

Special Options:

  • http_header

  • http_cookie

  • http_header

  • http_header

  • fast_pattern

source