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https://github.com/splunk/security_content
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Eric
76 lines
3.4 KiB
YAML
76 lines
3.4 KiB
YAML
name: Delete ShadowCopy With PowerShell
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id: 5ee2bcd0-b2ff-11eb-bb34-acde48001122
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version: 8
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date: '2025-05-02'
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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: The following analytic detects the use of PowerShell to delete shadow
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copies via the WMIC PowerShell module. It leverages EventCode 4104 and searches
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for specific keywords like "ShadowCopy," "Delete," or "Remove" within the ScriptBlockText.
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This activity is significant because deleting shadow copies is a common tactic used
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by ransomware, such as DarkSide, to prevent data recovery. If confirmed malicious,
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this action could lead to irreversible data loss and hinder recovery efforts, significantly
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impacting business continuity and data integrity.
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data_source:
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- Powershell Script Block Logging 4104
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search: '`powershell` EventCode=4104 ScriptBlockText= "*ShadowCopy*" (ScriptBlockText
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= "*Delete*" OR ScriptBlockText = "*Remove*") | fillnull | stats count min(_time)
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as firstTime max(_time) as lastTime by dest signature signature_id user_id vendor_product
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EventID Guid Opcode Name Path ProcessID ScriptBlockId 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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drilldown_searches:
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- name: View the detection results for - "$user_id$" and "$dest$"
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search: '%original_detection_search% | search user_id = "$user_id$" dest = "$dest$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$user_id$" and "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user_id$",
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"$dest$") starthoursago=168 | stats count min(_time) as firstTime max(_time)
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as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk
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Message" values(analyticstories) as "Analytic Stories" values(annotations._all)
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as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics"
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by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: An attempt to delete ShadowCopy was performed using PowerShell on $dest$
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by $user_id$.
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risk_objects:
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- field: user_id
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type: user
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score: 81
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- field: dest
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type: system
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score: 81
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threat_objects: []
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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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- DarkGate Malware
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- Cactus Ransomware
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- VanHelsing Ransomware
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asset_type: Endpoint
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mitre_attack_id:
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- T1490
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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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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/single_event_delete_shadowcopy.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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