PowerShell Get-Process LSASS

Hunt Hypothesis

Detects a “Get-Process” cmdlet and it’s aliases on lsass process, which is in almost all cases a sign of malicious activity

Detection Rule

Sigma (Original)

title: PowerShell Get-Process LSASS
id: b2815d0d-7481-4bf0-9b6c-a4c48a94b349
status: test
description: Detects a "Get-Process" cmdlet and it's aliases on lsass process, which is in almost all cases a sign of malicious activity
references:
    - https://web.archive.org/web/20220205033028/https://twitter.com/PythonResponder/status/1385064506049630211
author: Florian Roth (Nextron Systems)
date: 2021-04-23
modified: 2023-01-05
tags:
    - attack.credential-access
    - attack.t1552.004
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains:
            # You can add more permutation as you see fit
            - 'Get-Process lsas'
            - 'ps lsas'
            - 'gps lsas'
    condition: selection
falsepositives:
    - Unknown
level: high

KQL (Azure Sentinel)

imProcessCreate
| where TargetProcessCommandLine contains "Get-Process lsas" or TargetProcessCommandLine contains "ps lsas" or TargetProcessCommandLine contains "gps lsas"

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Tactic: Credential Access
• Technique: T1552.004 — T1552.004

References

• https://web.archive.org/web/20220205033028/https://twitter.com/PythonResponder/status/1385064506049630211
• SigmaHQ Rule