Detect Copy of ShadowCopy with Script Block Logging

name: Detect Copy of ShadowCopy with Script Block Logging
id: 9251299c-ea5b-11eb-a8de-acde48001122
version: 12
creation_date: '2021-07-21'
modification_date: '2026-05-13'
author: Michael Haag, Splunk
status: production
type: TTP
description: The following analytic detects the use of PowerShell commands to copy the SAM, SYSTEM, or SECURITY hives, which are critical for credential theft. It leverages PowerShell Script Block Logging (EventCode=4104) to capture and analyze the full command executed. This activity is significant as it indicates an attempt to exfiltrate sensitive registry hives for offline password cracking. If confirmed malicious, this could lead to unauthorized access to credentials, enabling further compromise of the system and potential lateral movement within the network.
data_source:
    - Powershell Script Block Logging 4104
search: '`powershell` EventCode=4104 ScriptBlockText IN ("*copy*","*[System.IO.File]::Copy*") AND ScriptBlockText IN ("*System32\\config\\SAM*", "*System32\\config\\SYSTEM*","*System32\\config\\SECURITY*") | fillnull | stats count min(_time) as firstTime max(_time) as lastTime by dest signature signature_id user_id vendor_product EventID Guid Opcode Name Path ProcessID ScriptBlockId ScriptBlockText | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `detect_copy_of_shadowcopy_with_script_block_logging_filter`'
how_to_implement: To successfully implement this analytic, you will need to enable PowerShell Script Block Logging on some or all endpoints. Additional setup here https://help.splunk.com/en/security-offerings/splunk-user-behavior-analytics/get-data-in/5.4.1/add-other-data-to-splunk-uba/configure-powershell-logging-to-see-powershell-anomalies-in-splunk-uba.
known_false_positives: Limited false positives as the scope is limited to SAM, SYSTEM and SECURITY hives.
references:
    - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934
    - https://github.com/GossiTheDog/HiveNightmare
    - https://github.com/JumpsecLabs/Guidance-Advice/tree/main/SAM_Permissions
finding:
    title: PowerShell was identified running a script to capture the SAM hive on endpoint $dest$ by user $user_id$.
    entity:
        field: user_id
        type: user
        score: 50
intermediate_findings:
    entities:
        - field: dest
          type: system
          score: 50
          message: PowerShell was identified running a script to capture the SAM hive on endpoint $dest$ by user $user_id$.
analytic_story:
    - Credential Dumping
    - VanHelsing Ransomware
asset_type: Endpoint
cve:
    - CVE-2021-36934
mitre_attack_id:
    - T1003.002
product:
    - Splunk Enterprise
    - Splunk Enterprise Security
    - Splunk Cloud
category: endpoint
security_domain: endpoint