Copying Sensitive Files with Credential Data — Sigma Rule

Rule metadata and linked tags

Author: Teymur Kheirkhabarov, Daniil Yugoslavskiy, oscd.community. Source status: test; severity: high. Source dates: 2019-10-22 / 2024-06-04.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: a713616da638570e6e01497af0d0cb501b4429aca2ecdaa2baa63bf21f5a137d

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Copying Sensitive Files with Credential Data
id: e7be6119-fc37-43f0-ad4f-1f3f99be2f9f
status: test
description: Files with well-known filenames (sensitive files with credential data) copying
references:
    - https://room362.com/post/2013/2013-06-10-volume-shadow-copy-ntdsdit-domain-hashes-remotely-part-1/
    - https://www.slideshare.net/heirhabarov/hunting-for-credentials-dumping-in-windows-environment
    - https://dfironthemountain.wordpress.com/2018/12/06/locked-file-access-using-esentutl-exe/
    - https://github.com/LOLBAS-Project/LOLBAS/blob/2cc01b01132b5c304027a658c698ae09dd6a92bf/yml/OSBinaries/Esentutl.yml
author: Teymur Kheirkhabarov, Daniil Yugoslavskiy, oscd.community
date: 2019-10-22
modified: 2024-06-04
tags:
    - attack.credential-access
    - attack.t1003.002
    - attack.t1003.003
    - car.2013-07-001
    - attack.s0404
logsource:
    category: process_creation
    product: windows
detection:
    selection_esent_img:
        - Image|endswith: '\esentutl.exe'
        - OriginalFileName: '\esentutl.exe'
    selection_esent_cli:
        CommandLine|contains|windash:
            - 'vss'
            - ' /m '
            - ' /y '
    selection_susp_paths:
        CommandLine|contains:
            - '\config\RegBack\sam'
            - '\config\RegBack\security'
            - '\config\RegBack\system'
            - '\config\sam'
            - '\config\security'
            - '\config\system '        # space needed to avoid false positives with \config\systemprofile\
            - '\repair\sam'
            - '\repair\security'
            - '\repair\system'
            - '\windows\ntds\ntds.dit'
    condition: all of selection_esent_* or selection_susp_paths
falsepositives:
    - Copying sensitive files for legitimate use (eg. backup) or forensic investigation by legitimate incident responder or forensic investigator.
level: high

Original YAML and metadata in JSON

False positives

• Copying sensitive files for legitimate use (eg. backup) or forensic investigation by legitimate incident responder or forensic investigator.

Source references

• https://room362.com/post/2013/2013-06-10-volume-shadow-copy-ntdsdit-domain-hashes-remotely-part-1/
• https://www.slideshare.net/heirhabarov/hunting-for-credentials-dumping-in-windows-environment
• https://dfironthemountain.wordpress.com/2018/12/06/locked-file-access-using-esentutl-exe/
• https://github.com/LOLBAS-Project/LOLBAS/blob/2cc01b01132b5c304027a658c698ae09dd6a92bf/yml/OSBinaries/Esentutl.yml