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win_defender_asr_lsass_access.yml
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/
win_defender_asr_lsass_access.yml
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title: LSASS Access Detected via Attack Surface Reduction
id: a0a278fe-2c0e-4de2-ac3c-c68b08a9ba98
status: test
description: Detects Access to LSASS Process
references:
- https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-exploit-guard/attack-surface-reduction-exploit-guard?WT.mc_id=twitter
author: Markus Neis
date: 2018/08/26
modified: 2022/08/13
tags:
- attack.credential_access
- attack.t1003.001
logsource:
product: windows
service: windefend
definition: 'Requirements:Enabled Block credential stealing from the Windows local security authority subsystem (lsass.exe) from Attack Surface Reduction (GUID: 9e6c4e1f-7d60-472f-ba1a-a39ef669e4b2)'
detection:
selection:
EventID: 1121
Path|endswith: '\lsass.exe'
filter_thor:
ProcessName|startswith: 'C:\Windows\Temp\asgard2-agent\'
ProcessName|endswith:
- '\thor64.exe'
- '\thor.exe'
filter_exact:
ProcessName:
- 'C:\Windows\System32\atiesrxx.exe'
- 'C:\Windows\System32\CompatTelRunner.exe'
- 'C:\Windows\System32\msiexec.exe'
- 'C:\Windows\System32\nvwmi64.exe'
- 'C:\Windows\System32\svchost.exe'
- 'C:\Windows\System32\Taskmgr.exe'
- 'C:\Windows\System32\wbem\WmiPrvSE.exe'
- 'C:\Windows\SysWOW64\msiexec.exe'
filter_begins:
ProcessName|startswith:
- 'C:\Windows\System32\DriverStore\'
- 'C:\WINDOWS\Installer\'
- 'C:\Program Files\'
- 'C:\Program Files (x86)\'
condition: selection and not 1 of filter_*
falsepositives:
- Google Chrome GoogleUpdate.exe
- Some Taskmgr.exe related activity
level: high