""ET TROJAN FIN7 JSSLoader Variant Activity (GET)""

SID: 2033074

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2021_06_02, deployment Perimeter, deployment SSLDecrypt, malware_family jssLoader, performance_impact Low, signature_severity Major, updated_at 2021_06_02

Reference:

  • md5

  • 6a20636bed7deafe7317400bd18c7b9e

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: "/?id=" Depth: 5

  • Value: !"Referer|3a 20|"

  • Value: !"Accept"

Within:

PCRE: "/\/\?id=[a-zA-z]{5,10}_[A-F0-9]{12}$/U"

Special Options:

  • http_method

  • fast_pattern

  • http_uri

  • http_header

  • http_header

source