splunk-security_content/docs/_posts/2019-12-10-creation_of_shadow_copy.md

title, excerpt, categories, last_modified_at, toc, toc_label, tags

title	excerpt	categories	last_modified_at	toc	toc_label	tags
Creation of Shadow Copy	NTDS , OS Credential Dumping	Endpoint	2019-12-10	true		NTDS OS Credential Dumping Credential Access Credential Access Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

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Description

Monitor for signs that Vssadmin or Wmic has been used to create a shadow copy.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2019-12-10
• Author: Patrick Bareiss, Splunk
• ID: eb120f5f-b879-4a63-97c1-93352b5df844

ATT&CK

ID	Technique	Tactic
T1003.003	NTDS	Credential Access

| T1003 | OS Credential Dumping | Credential Access |

Search

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where (Processes.process_name=vssadmin.exe Processes.process=*create* Processes.process=*shadow*) OR (Processes.process_name=wmic.exe Processes.process=*shadowcopy* Processes.process=*create*) by Processes.dest Processes.user Processes.process_name Processes.process  Processes.parent_process Processes.process_id Processes.parent_process_id 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)` 
| `creation_of_shadow_copy_filter`

Macros

The SPL above uses the following Macros:

• security_content_ctime
• security_content_summariesonly

Note that creation_of_shadow_copy_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

• _time
• Processes.dest
• Processes.user
• Processes.parent_process_name
• Processes.parent_process
• Processes.original_file_name
• Processes.process_name
• Processes.process
• Processes.process_id
• Processes.parent_process_path
• Processes.process_path
• Processes.parent_process_id

How To Implement

You must be ingesting endpoint data that tracks process activity, including parent-child relationships from your endpoints, to populate the Endpoint data model in the Processes node. The command-line arguments are mapped to the "process" field in the Endpoint data model.

Known False Positives

Legitimate administrator usage of Vssadmin or Wmic will create false positives.

Associated Analytic story

• Credential Dumping

Kill Chain Phase

• Actions on Objectives

RBA

Risk Score	Impact	Confidence	Message
81.0	90	90	An instance of parent_process_name spawning process_name was identified on endpoint dest by user user attempting to create a shadow copy to perform offline password cracking.

Reference

• https://2017.zeronights.org/wp-content/uploads/materials/ZN17_Kheirkhabarov_Hunting_for_Credentials_Dumping_in_Windows_Environment.pdf

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1003.003/atomic_red_team/windows-sysmon.log

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