""ET WEB_CLIENT Multibrowser Resource Exhaustion observed in Tech Support Scam""

SID: 2024305

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2017_05_16, deployment Perimeter, signature_severity Major, updated_at 2019_08_16

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: from_server,established

Contents:

  • Value: "var|20|total|20|=|20 22 22 3b|"

  • Value: "total|20|=|20|total"

  • Value: "history.pushState"

Within:

PCRE: "/^\s(\s0\s,\s0\s,\stotal\s*)/Ri"

Special Options:

  • file_data

  • nocase

  • nocase

  • nocase

  • fast_pattern

source