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creation_of_shadow_copy.yml
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creation_of_shadow_copy.yml
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name: Creation of Shadow Copy
id: eb120f5f-b879-4a63-97c1-93352b5df844
version: 3
date: '2024-05-19'
author: Patrick Bareiss, Splunk
status: production
type: TTP
description: The following analytic detects the creation of shadow copies using Vssadmin
or Wmic. It leverages data from Endpoint Detection and Response (EDR) agents, focusing
on process execution logs that include command-line details. This activity is significant
because creating shadow copies can be a precursor to ransomware attacks or data
exfiltration, allowing attackers to bypass file locks and access sensitive data.
If confirmed malicious, this behavior could enable attackers to maintain persistence,
recover deleted files, or prepare for further malicious activities, posing a significant
risk to the integrity and confidentiality of the system.
data_source:
- Sysmon EventID 1
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_name 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`'
how_to_implement: The detection is based on data that originates from Endpoint Detection
and Response (EDR) agents. These agents are designed to provide security-related
telemetry from the endpoints where the agent is installed. To implement this search,
you must ingest logs that contain the process GUID, process name, and parent process.
Additionally, you must ingest complete command-line executions. These logs must
be processed using the appropriate Splunk Technology Add-ons that are specific to
the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
data model. Use the Splunk Common Information Model (CIM) to normalize the field
names and speed up the data modeling process.
known_false_positives: Legitimate administrator usage of Vssadmin or Wmic will create
false positives.
references:
- https://2017.zeronights.org/wp-content/uploads/materials/ZN17_Kheirkhabarov_Hunting_for_Credentials_Dumping_in_Windows_Environment.pdf
- https://media.defense.gov/2023/May/24/2003229517/-1/-1/0/CSA_Living_off_the_Land.PDF
tags:
analytic_story:
- Credential Dumping
- Volt Typhoon
asset_type: Endpoint
confidence: 90
impact: 90
message: 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.
mitre_attack_id:
- T1003.003
- T1003
observable:
- name: user
type: User
role:
- Victim
- name: dest
type: Hostname
role:
- Victim
- name: parent_process_name
type: Process
role:
- Attacker
product:
- Splunk Enterprise
- Splunk Enterprise Security
- Splunk Cloud
required_fields:
- _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
risk_score: 81
security_domain: endpoint
tests:
- name: True Positive Test
attack_data:
- data:
https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1003.003/atomic_red_team/windows-sysmon.log
source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
sourcetype: xmlwineventlog
- name: True Positive Test
attack_data:
- data:
https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1003.003/atomic_red_team/crowdstrike_falcon.log
source: crowdstrike
sourcetype: crowdstrike:events:sensor