Sigma rule: LSASS Process Reconnaissance Via Findstr.EXE

Rule

Title

LSASS Process Reconnaissance Via Findstr.EXE

Status

test

Level

high

Author

Florian Roth (Nextron Systems)

Date

2022-08-12

Modified

2024-06-04

File

rules/windows/process_creation/proc_creation_win_findstr_lsass.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

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

Log source

product

windows

category

process_creation

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

False positives (as the rule lists them)

• Unknown

Tags

• attack.credential-access
• attack.t1552.006

MITRE ATT&CK ids this rule names

• T1552.006

References

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

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_findstr_lsass.yml