""ET INFO Suspected Malicious Powershell Script (Inbound)""

SID: 2049234

Revision: 1

Class Type: bad-unknown

Metadata: attack_target Client_Endpoint, created_at 2023_11_16, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Informational, updated_at 2023_11_16

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "set-strictmode -"

  • Value: "GetAssemblies"

  • Value: "|5b 5d 5d 24|"

  • Value: "GetDelegateForFunctionPointer"

Within:

PCRE:

Special Options:

  • file_data

  • nocase

  • fast_pattern

  • nocase

  • nocase

source