detection.wiki

Detection rules › Sigma

Windows PowerShell User Agent

Status
test
Severity
medium
Log source
category proxy
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects Windows PowerShell Web Access

MITRE ATT&CK coverage

TacticTechniques
Command & ControlT1071.001 Application Layer Protocol: Web Protocols

Rule body yaml

title: Windows PowerShell User Agent
id: c8557060-9221-4448-8794-96320e6f3e74
status: test
description: Detects Windows PowerShell Web Access
references:
    - https://msdn.microsoft.com/powershell/reference/5.1/microsoft.powershell.utility/Invoke-WebRequest
author: Florian Roth (Nextron Systems)
date: 2017-03-13
modified: 2021-11-27
tags:
    - attack.command-and-control
    - attack.t1071.001
logsource:
    category: proxy
detection:
    selection:
        c-useragent|contains: ' WindowsPowerShell/'
    condition: selection
falsepositives:
    - Administrative scripts that download files from the Internet
    - Administrative scripts that retrieve certain website contents
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    c-useragent|contains: ' WindowsPowerShell/'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
c-useragentmatch
  • WindowsPowerShell/