Delete ShadowCopy With PowerShell
Description
This following analytic detects PowerShell command to delete shadow copy using the WMIC PowerShell module. This technique was seen used by a recent adversary to deploy DarkSide Ransomware where it executed a child process of PowerShell to execute a hex encoded command to delete shadow copy. This hex encoded command was able to be decrypted by PowerShell log.
- Type: TTP
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2021-05-12
- Author: Teoderick Contreras, Splunk
- ID: 5ee2bcd0-b2ff-11eb-bb34-acde48001122
ATT&CK
| ID | Technique | Tactic |
|---|---|---|
| T1490 | Inhibit System Recovery | Impact |
Search
`powershell` EventCode=4104 Message= "*ShadowCopy*" (Message = "*Delete*" OR Message = "*Remove*")
| stats count min(_time) as firstTime max(_time) as lastTime by EventCode Message ComputerName User
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `delete_shadowcopy_with_powershell_filter`
Associated Analytic Story
How To Implement
To successfully implement this search, you need to be ingesting logs with the powershell logs from your endpoints. make sure you enable needed registry to monitor this event.
Required field
- _time
- EventCode
- Message
- ComputerName
- User
Kill Chain Phase
- Exploitation
Known False Positives
unknown
RBA
| Risk Score | Impact | Confidence | Message |
|---|---|---|---|
| 81.0 | 90 | 90 | An attempt to delete ShadowCopy was performed using PowerShell on $ComputerName$ by $User$. |
Reference
- https://www.fireeye.com/blog/threat-research/2021/05/shining-a-light-on-darkside-ransomware-operations.html
- https://searchwindowsserver.techtarget.com/tutorial/Set-up-PowerShell-script-block-logging-for-added-security
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
source | version: 1