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P4T12ICK
66 lines
2.3 KiB
YAML
66 lines
2.3 KiB
YAML
name: Delete ShadowCopy With PowerShell
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id: 5ee2bcd0-b2ff-11eb-bb34-acde48001122
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version: 2
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date: '2022-05-02'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: This following analytic detects PowerShell command to delete shadow copy
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using the WMIC PowerShell module. This technique was seen used by a recent adversary
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to deploy DarkSide Ransomware where it executed a child process of PowerShell to
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execute a hex encoded command to delete shadow copy. This hex encoded command was
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able to be decrypted by PowerShell log.
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data_source:
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- Powershell 4104
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search: '`powershell` EventCode=4104 ScriptBlockText= "*ShadowCopy*" (ScriptBlockText
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= "*Delete*" OR ScriptBlockText = "*Remove*") | stats count min(_time) as firstTime
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max(_time) as lastTime by Opcode Computer UserID EventCode ScriptBlockText | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `delete_shadowcopy_with_powershell_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the powershell logs from your endpoints. make sure you enable needed
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registry to monitor this event.
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known_false_positives: unknown
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references:
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- https://www.mandiant.com/resources/shining-a-light-on-darkside-ransomware-operations
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- https://www.techtarget.com/searchwindowsserver/tutorial/Set-up-PowerShell-script-block-logging-for-added-security
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tags:
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analytic_story:
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- DarkSide Ransomware
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- Ransomware
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- Revil Ransomware
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asset_type: Endpoint
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confidence: 90
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impact: 90
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message: An attempt to delete ShadowCopy was performed using PowerShell on $Computer$
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by $User$.
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mitre_attack_id:
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- T1490
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observable:
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- name: UserID
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type: User
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role:
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- Victim
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- name: Computer
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type: Hostname
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- ScriptBlockText
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- Opcode
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- Computer
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- UserID
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- EventCode
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risk_score: 81
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.001/powershell_script_block_logging/sbl_xml.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: xmlwineventlog
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