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Detection rules › Sigma

PowerShell Get-Process LSASS

Status
test
Severity
high
Log source
product windows, category process_creation
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

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

MITRE ATT&CK coverage

TacticTechniques
Credential AccessT1552.004 Unsecured Credentials: Private Keys

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation
Security-AuditingEvent ID 4688A new process has been created.

Rule body yaml

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|contains:
        - 'Get-Process lsas'
        - 'ps lsas'
        - 'gps lsas'

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
CommandLinematch
  • Get-Process lsas
  • gps lsas
  • ps lsas