Diskshadow Script Mode - Execution From Potential Suspicious Location — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2023-09-15 / 2024-03-05.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 5d8338895123ada9750cdaaef3782d1381fd75f90839661df24efdafa63b1a04

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: Diskshadow Script Mode - Execution From Potential Suspicious Location
id: fa1a7e52-3d02-435b-81b8-00da14dd66c1
related:
    - id: 1dde5376-a648-492e-9e54-4241dd9b0c7f # Diskshadow Script Mode - Uncommon Script Extension Execution
      type: similar
    - id: 9f546b25-5f12-4c8d-8532-5893dcb1e4b8 # Potentially Suspicious Child Process Of DiskShadow.EXE
      type: similar
    - id: 56b1dde8-b274-435f-a73a-fb75eb81262a # Diskshadow Child Process Spawned
      type: similar
    - id: 0c2f8629-7129-4a8a-9897-7e0768f13ff2 # Diskshadow Script Mode Execution
      type: similar
status: test
description: Detects execution of "Diskshadow.exe" in script mode using the "/s" flag where the script is located in a potentially suspicious location.
references:
    - https://bohops.com/2018/03/26/diskshadow-the-return-of-vss-evasion-persistence-and-active-directory-database-extraction/
    - https://www.ired.team/offensive-security/credential-access-and-credential-dumping/ntds.dit-enumeration
    - https://medium.com/@cyberjyot/lolbin-execution-via-diskshadow-f6ff681a27a4
    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/diskshadow
    - https://www.lifars.com/wp-content/uploads/2022/01/GriefRansomware_Whitepaper-2.pdf
    - https://www.zscaler.com/blogs/security-research/technical-analysis-crytox-ransomware
    - https://research.checkpoint.com/2022/evilplayout-attack-against-irans-state-broadcaster/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-09-15
modified: 2024-03-05
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - OriginalFileName: 'diskshadow.exe'
        - Image|endswith: '\diskshadow.exe'
    selection_cli:
        CommandLine|contains|windash: '-s '
    selection_paths:
        CommandLine|contains:
            # Note: Add additional susp paths based on your org needs
            - ':\Temp\'
            - ':\Windows\Temp\'
            - '\AppData\Local\'
            - '\AppData\Roaming\'
            - '\ProgramData\'
            - '\Users\Public\'
    condition: all of selection_*
falsepositives:
    - False positives may occur if you execute the script from one of the paths mentioned in the rule. Apply additional filters that fits your org needs.
level: medium

Original YAML and metadata in JSON

False positives

• False positives may occur if you execute the script from one of the paths mentioned in the rule. Apply additional filters that fits your org needs.

Source references

• https://bohops.com/2018/03/26/diskshadow-the-return-of-vss-evasion-persistence-and-active-directory-database-extraction/
• https://www.ired.team/offensive-security/credential-access-and-credential-dumping/ntds.dit-enumeration
• https://medium.com/@cyberjyot/lolbin-execution-via-diskshadow-f6ff681a27a4
• https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/diskshadow
• https://www.lifars.com/wp-content/uploads/2022/01/GriefRansomware_Whitepaper-2.pdf
• https://www.zscaler.com/blogs/security-research/technical-analysis-crytox-ransomware
• https://research.checkpoint.com/2022/evilplayout-attack-against-irans-state-broadcaster/