Sigma rule: Sysmon Discovery Via Default Driver Altitude Using Findstr.EXE

Rule

Title

Sysmon Discovery Via Default Driver Altitude Using Findstr.EXE

Status

test

Level

high

Author

frack113

Date

2021-12-16

Modified

2023-11-14

File

rules/windows/process_creation/proc_creation_win_findstr_sysmon_discovery_via_default_altitude.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects usage of "findstr" with the argument "385201". Which could indicate potential discovery of an installed Sysinternals Sysmon service using the default driver altitude (even if the name is changed).

Log source

product

windows

category

process_creation

Detection

selection_img:
    - Image|endswith:
          - '\find.exe'
          - '\findstr.exe'
    - OriginalFileName:
          - 'FIND.EXE'
          - 'FINDSTR.EXE'
selection_cli:
    CommandLine|contains: ' 385201' # Sysmon driver default altitude
condition: all of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.discovery
• attack.t1518.001

MITRE ATT&CK ids this rule names

• T1518.001

References

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1518.001/T1518.001.md#atomic-test-5---security-software-discovery---sysmon-service

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_sysmon_discovery_via_default_altitude.yml