""ET WEB_CLIENT JS Obfuscation - Possible Phishing 2016-03-01""

SID: 2022578

Revision: 3

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2016_03_01, deployment Perimeter, signature_severity Critical, tag Phishing, updated_at 2019_04_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: from_server,established

Contents:

  • Value: "200"

  • Value: "Content-Type|3a 20|text/html"

  • Value: "unescape=function"

  • Value: "replace(new RegExp(|22|%26|22|, |22|g|22|), |22|&|22|)|3b|"

  • Value: "replace(new RegExp(|22|%3B|22|, |22|g|22|), |22 3b 22|)|3b|"

  • Value: "document.write"

  • Value: "replace(|27|<?"

Within:

PCRE:

Special Options:

  • http_stat_code

  • http_header

  • file_data

  • fast_pattern

  • nocase

  • nocase

  • nocase

  • nocase

source