Detection rules › Sigma

LSASS Access Detected via Attack Surface Reduction

Severity
high
Author
Markus Neis
Source
upstream

Detects Access to LSASS Process

MITRE ATT&CK coverage

TacticTechniques
Credential AccessT1003.001 OS Credential Dumping: LSASS Memory

Event coverage

ProviderEvent IDTitle
Windows-Defender1121

Stages and Predicates

Stage 1: selection

Path|endswith: '\lsass.exe'

Stage 2: not 1 of filter_*

or:
or:
ProcessName|endswith: '\thor.exe'
ProcessName|endswith: '\thor64.exe'
ProcessName|startswith: 'C:\Windows\Temp\asgard2-agent\'
ProcessName: 'C:\Windows\SysWOW64\msiexec.exe'
ProcessName: 'C:\Windows\System32\CompatTelRunner.exe'
ProcessName: 'C:\Windows\System32\Taskmgr.exe'
ProcessName: 'C:\Windows\System32\atiesrxx.exe'
ProcessName: 'C:\Windows\System32\msiexec.exe'
ProcessName: 'C:\Windows\System32\nvwmi64.exe'
ProcessName: 'C:\Windows\System32\svchost.exe'
ProcessName: 'C:\Windows\System32\wbem\WmiPrvSE.exe'
ProcessName|startswith: 'C:\Program Files (x86)\'
ProcessName|startswith: 'C:\Program Files\'
ProcessName|startswith: 'C:\WINDOWS\Installer\'
ProcessName|startswith: 'C:\Windows\System32\DriverStore\'

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
Pathends_with
  • \lsass.exe
ProcessNameends_with
  • \thor.exe corpus 2 (sigma 2)
  • \thor64.exe corpus 2 (sigma 2)
ProcessNameeq
  • C:\Windows\SysWOW64\msiexec.exe
  • C:\Windows\System32\CompatTelRunner.exe
  • C:\Windows\System32\Taskmgr.exe
  • C:\Windows\System32\atiesrxx.exe
  • C:\Windows\System32\msiexec.exe
  • C:\Windows\System32\nvwmi64.exe
  • C:\Windows\System32\svchost.exe corpus 3 (sigma 3)
  • C:\Windows\System32\wbem\WmiPrvSE.exe corpus 2 (sigma 2)
ProcessNamestarts_with
  • C:\Program Files (x86)\
  • C:\Program Files\
  • C:\WINDOWS\Installer\
  • C:\Windows\System32\DriverStore\
  • C:\Windows\Temp\asgard2-agent\