""ET TROJAN Wintervivern Activity M2 (GET)""

SID: 2034106

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2021_10_04, deployment Perimeter, deployment SSLDecrypt, signature_severity Major, updated_at 2021_10_04

Reference:

  • md5

  • 7940c343ae91e7198acf83400b25252f

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: "vivern/"

  • Value: ".txt"

  • Value: !"Referer|3a 20|"

Within:

PCRE: "/.txt$/U"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_uri

  • http_header

source