sigmahighHunting

LSASS Access Detected via Attack Surface Reduction

Detects Access to LSASS Process

MITRE ATT&CK

credential-access

Detection Query

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_*

Author

Markus Neis

Created

2018-08-26

Data Sources

windowswindefend

Platforms

windows

References

https://learn.microsoft.com/en-us/defender-endpoint/attack-surface-reduction

Tags

attack.credential-accessattack.t1003.001

Raw Content

title: LSASS Access Detected via Attack Surface Reduction
id: a0a278fe-2c0e-4de2-ac3c-c68b08a9ba98
status: test
description: Detects Access to LSASS Process
references:
    - https://learn.microsoft.com/en-us/defender-endpoint/attack-surface-reduction
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