Sigma rule: LOLBIN Execution From Abnormal Drive

Rule

Title

LOLBIN Execution From Abnormal Drive

Status

test

Level

medium

Author

Christopher Peacock '@securepeacock', SCYTHE '@scythe_io', Angelo Violetti - SEC Consult '@angelo_violetti', Aaron Herman

Date

2022-01-25

Modified

2023-08-29

File

rules/windows/process_creation/proc_creation_win_susp_lolbin_exec_from_non_c_drive.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects LOLBINs executing from an abnormal or uncommon drive such as a mounted ISO.

Log source

product

windows

category

process_creation

Detection

selection:
    # Note: add more lolbins for additional coverage
    - Image|endswith:
          - '\calc.exe'
          - '\certutil.exe'
          - '\cmstp.exe'
          - '\cscript.exe'
          - '\installutil.exe'
          - '\mshta.exe'
          - '\regsvr32.exe'
          - '\rundll32.exe'
          - '\wscript.exe'
    - OriginalFileName:
          - 'CALC.EXE'
          - 'CertUtil.exe'
          - 'CMSTP.EXE'
          - 'cscript.exe'
          - 'installutil.exe'
          - 'MSHTA.EXE'
          - 'REGSVR32.EXE'
          - 'RUNDLL32.EXE'
          - 'wscript.exe'
filter_main_currentdirectory:
    CurrentDirectory|contains: 'C:\'
filter_main_empty:
    CurrentDirectory: ''
filter_main_null:
    CurrentDirectory: null
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

• Rare false positives could occur on servers with multiple drives.

Tags

• attack.stealth

Related rules

• 5b80cf53-3a46-4adc-960b-05ec19348d74 (similar)

References

• https://thedfirreport.com/2021/12/13/diavol-ransomware/
• https://www.scythe.io/library/threat-emulation-qakbot
• https://sec-consult.com/blog/detail/bumblebee-hunting-with-a-velociraptor/

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_susp_lolbin_exec_from_non_c_drive.yml