""ET WEB_CLIENT Generic Attempted Executable Drop via VBScript""

SID: 2031508

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2021_01_11, deployment Perimeter, signature_severity Major, updated_at 2021_01_11

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "<SCRIPT Language=VBScript"

  • Value: "DropFileName"

  • Value: ".exe"

  • Value: "WriteData =|20 22|4D5A"

Within: 100

PCRE:

Special Options:

  • file_data

  • nocase

  • nocase

  • nocase

  • nocase

  • fast_pattern

source