sigmahighHunting

LSASS Process Reconnaissance Via Findstr.EXE

Detects findstring commands that include the keyword lsass, which indicates recon actviity for the LSASS process PID

MITRE ATT&CK

credential-access

Detection Query

selection_findstr_img:
  - Image|endswith:
      - \find.exe
      - \findstr.exe
  - OriginalFileName:
      - FIND.EXE
      - FINDSTR.EXE
selection_findstr_cli:
  CommandLine|contains: lsass
selection_special:
  CommandLine|contains|windash:
    - ' /i "lsass'
    - " /i lsass.exe"
    - findstr "lsass
    - findstr lsass
    - findstr.exe "lsass
    - findstr.exe lsass
condition: all of selection_findstr_* or selection_special

Author

Florian Roth (Nextron Systems)

Created

2022-08-12

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://blog.talosintelligence.com/2022/08/recent-cyber-attack.html?m=1

Tags

attack.credential-accessattack.t1552.006

Raw Content

title: LSASS Process Reconnaissance Via Findstr.EXE
id: fe63010f-8823-4864-a96b-a7b4a0f7b929
status: test
description: Detects findstring commands that include the keyword lsass, which indicates recon actviity for the LSASS process PID
references:
    - https://blog.talosintelligence.com/2022/08/recent-cyber-attack.html?m=1
author: Florian Roth (Nextron Systems)
date: 2022-08-12
modified: 2024-06-04
tags:
    - attack.credential-access
    - attack.t1552.006
logsource:
    category: process_creation
    product: windows
detection:
    selection_findstr_img:
        - Image|endswith:
              - '\find.exe'
              - '\findstr.exe'
        - OriginalFileName:
              - 'FIND.EXE'
              - 'FINDSTR.EXE'
    selection_findstr_cli:
        CommandLine|contains: 'lsass'
    selection_special:
        CommandLine|contains|windash:
            - ' /i "lsass'
            - ' /i lsass.exe'
            - 'findstr "lsass'
            - 'findstr lsass'
            - 'findstr.exe "lsass'
            - 'findstr.exe lsass'
    condition: all of selection_findstr_* or selection_special
falsepositives:
    - Unknown
level: high
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_findstr_lsass/info.yml