41 lines
963 B
YAML
41 lines
963 B
YAML
|
|
title: PowerShell Downgrade Attack
|
|
author: Harish Segar (rule)
|
|
date: 2020/03/20
|
|
description: Detects PowerShell downgrade attack by comparing the host versions with
|
|
the actually used engine version 2.0
|
|
detection:
|
|
SELECTION_1:
|
|
EventID: 1
|
|
SELECTION_2:
|
|
CommandLine:
|
|
- '* -version 2 *'
|
|
- '* -versio 2 *'
|
|
- '* -versi 2 *'
|
|
- '* -vers 2 *'
|
|
- '* -ver 2 *'
|
|
- '* -ve 2 *'
|
|
SELECTION_3:
|
|
Image: '*\powershell.exe'
|
|
condition: (SELECTION_1 and SELECTION_2 and SELECTION_3)
|
|
falsepositives:
|
|
- Penetration Test
|
|
- Unknown
|
|
id: b3512211-c67e-4707-bedc-66efc7848863
|
|
level: medium
|
|
logsource:
|
|
category: process_creation
|
|
product: windows
|
|
references:
|
|
- http://www.leeholmes.com/blog/2017/03/17/detecting-and-preventing-powershell-downgrade-attacks/
|
|
related:
|
|
- id: 6331d09b-4785-4c13-980f-f96661356249
|
|
type: derived
|
|
status: experimental
|
|
tags:
|
|
- attack.defense_evasion
|
|
- attack.execution
|
|
- attack.t1086
|
|
- attack.t1059.001
|
|
ruletype: SIGMA
|