Potential Credential Dumping Via LSASS SilentProcessExit Technique

Hunt Hypothesis

Detects changes to the Registry in which a monitor program gets registered to dump the memory of the lsass.exe process

Detection Rule

Sigma (Original)

title: Potential Credential Dumping Via LSASS SilentProcessExit Technique
id: 55e29995-75e7-451a-bef0-6225e2f13597
related:
    - id: 36803969-5421-41ec-b92f-8500f79c23b0
      type: similar
status: test
description: Detects changes to the Registry in which a monitor program gets registered to dump the memory of the lsass.exe process
references:
    - https://www.deepinstinct.com/2021/02/16/lsass-memory-dumps-are-stealthier-than-ever-before-part-2/
    - https://oddvar.moe/2018/04/10/persistence-using-globalflags-in-image-file-execution-options-hidden-from-autoruns-exe/
author: Florian Roth (Nextron Systems)
date: 2021-02-26
modified: 2022-12-19
tags:
    - attack.credential-access
    - attack.t1003.001
logsource:
    category: registry_event
    product: windows
detection:
    selection:
        TargetObject|contains: 'Microsoft\Windows NT\CurrentVersion\SilentProcessExit\lsass.exe'
    condition: selection
falsepositives:
    - Unlikely
level: critical

KQL (Azure Sentinel)

imRegistry
| where RegistryKey contains "Microsoft\\Windows NT\\CurrentVersion\\SilentProcessExit\\lsass.exe"

KQL (Microsoft 365 Defender)

DeviceRegistryEvents
| where RegistryKey contains "Microsoft\\Windows NT\\CurrentVersion\\SilentProcessExit\\lsass.exe"

Required Data Sources

False Positive Guidance

• Unlikely

MITRE ATT&CK Context

• Tactic: Credential Access
• Technique: T1003.001 — T1003.001

References

• https://www.deepinstinct.com/2021/02/16/lsass-memory-dumps-are-stealthier-than-ever-before-part-2/
• https://oddvar.moe/2018/04/10/persistence-using-globalflags-in-image-file-execution-options-hidden-from-autoruns-exe/
• SigmaHQ Rule