mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Gowthamaraj rajendran
72 lines
3.1 KiB
YAML
72 lines
3.1 KiB
YAML
name: Windows Diskshadow Proxy Execution
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id: 58adae9e-8ea3-11ec-90f6-acde48001122
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version: 1
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date: '2022-02-15'
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author: Lou Stella, Splunk
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status: production
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type: TTP
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description: DiskShadow.exe is a Microsoft Signed binary present on Windows Server.
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It has a scripting mode intended for complex scripted backup operations. This feature
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also allows for execution of arbitrary unsigned code. This analytic looks for the
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usage of the scripting mode flags in executions of DiskShadow. During triage, compare
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to known backup behavior in your environment and then review the scripts called
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by diskshadow.
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data_source:
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- Sysmon Event ID 1
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where `process_diskshadow` (Processes.process=*-s*
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OR Processes.process=*/s*) by Processes.dest Processes.user Processes.parent_process
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Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `windows_diskshadow_proxy_execution_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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known_false_positives: Administrators using the DiskShadow tool in their infrastructure
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as a main backup tool with scripts will cause false positives that can be filtered
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with `windows_diskshadow_proxy_execution_filter`
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references:
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- https://bohops.com/2018/03/26/diskshadow-the-return-of-vss-evasion-persistence-and-active-directory-database-extraction/
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tags:
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analytic_story:
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- Living Off The Land
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: Possible Signed Binary Proxy Execution on $dest$
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mitre_attack_id:
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- T1218
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observable:
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- name: dest
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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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- Processes.process
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- Porcesses.dest
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- Processes.user
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- Processes.parent_process
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- Processes.process_name
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- Processes.process_id
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- Processes.parent_process_id
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- Processes.original_file_name
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risk_score: 49
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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/T1218/diskshadow/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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