""ET TROJAN Fake Browser Update via Error Page Payload""

SID: 2044885

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2023_04_04, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_04_04

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "let|20|agent|20 3d 20|navigator|2e|userAgent|2e|toLowerCase|28 29 3b|" Depth: 46

  • Value: "let|20|payload|5f|chrome|20 3d 20 27|"

  • Value: "let|20|payload|5f|firefox|20 3d 20 27|"

  • Value: "let|20|ua1|20 3d 20 27 27 3b|"

  • Value: "let|20|payload|20 3d 20 27 27 3b|"

Within:

PCRE:

Special Options:

  • file_data

  • fast_pattern

source