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

Known false positives

Administrative scripts that download files from the Internet
Administrative scripts that retrieve certain website contents

MITRE ATT&CK coverage

Tactic	Techniques
Command & Control	`T1071.001` Application Layer Protocol: Web Protocols

Rule body

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

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`c-useragent`	match	`WindowsPowerShell/`	`field:"c-useragent" kind:match value:" WindowsPowerShell/"`

Windows PowerShell User Agent

Known false positives

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection

Indicators

Stage 0: `condition`

Stage 1: `selection`