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Detection rules › Sigma

Suspicious Hyper-V Cmdlets

Status
test
Severity
medium
Log source
category ps_script, product windows
Author
frack113
Source
github.com/SigmaHQ/sigma

Adversaries may carry out malicious operations using a virtual instance to avoid detection

Known false positives

  • Legitimate PowerShell scripts

MITRE ATT&CK coverage

TacticTechniques
Stealth

Telemetry coverage

ProviderRecord / event type
PowerShellEvent ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body

title: Suspicious Hyper-V Cmdlets
id: 42d36aa1-3240-4db0-8257-e0118dcdd9cd
status: test
description: Adversaries may carry out malicious operations using a virtual instance to avoid detection
references:
    - https://learn.microsoft.com/en-us/virtualization/hyper-v-on-windows/quick-start/enable-hyper-v
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1564.006/T1564.006.md#atomic-test-3---create-and-start-hyper-v-virtual-machine
author: frack113
date: 2022-04-09
tags:
    - attack.stealth
    - attack.t1564.006
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains:
            - New-VM
            - Set-VMFirmware
            - Start-VM
    condition: selection
falsepositives:
    - Legitimate PowerShell scripts
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ScriptBlockText|contains:
        - New-VM
        - Set-VMFirmware
        - Start-VM

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
ScriptBlockTextmatch
  • New-VM
  • Set-VMFirmware
  • Start-VM
field:"ScriptBlockText" kind:match