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P4T12ICK
86 lines
3.3 KiB
YAML
86 lines
3.3 KiB
YAML
name: Windows Diskshadow Proxy Execution
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id: aa502688-9037-11ec-842d-acde48001122
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version: 1
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date: '2022-02-17'
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author: Lou Stella, Splunk
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type: Anomaly
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datamodel:
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- Endpoint_Processes
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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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search: '| from read_ssa_enriched_events() | where "Endpoint_Processes" IN(_datamodels)
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| eval timestamp=parse_long(ucast(map_get(input_event, "_time"), "string", null)),
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cmd_line=lower(ucast(map_get(input_event, "process"), "string", null)), process_name=lower(ucast(map_get(input_event,
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"process_name"), "string", null)), process_path=ucast(map_get(input_event, "process_path"),
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"string", null), parent_process_name=ucast(map_get(input_event, "parent_process_name"),
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"string", null), event_id=ucast(map_get(input_event, "event_id"), "string", null)
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| where cmd_line IS NOT NULL AND process_name IS NOT NULL AND process_name="diskshadow.exe"
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AND (like (cmd_line, "%-s%") OR like (cmd_line, "%/s%")) | eval start_time=timestamp,
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end_time=timestamp, entities=mvappend(ucast(map_get(input_event, "dest_user_id"),
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"string", null), ucast(map_get(input_event, "dest_device_id"), "string", null))
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| eval body=create_map(["event_id", event_id, "cmd_line", cmd_line, "process_name",
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process_name, "parent_process_name", parent_process_name, "process_path", process_path])
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| into write_ssa_detected_events();'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on processes that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint_Processess` datamodel.
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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
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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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cis20:
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- CIS 8
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Execution
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1218/diskshadow/windows-security.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest_device_id$ by user $dest_user_id$ attempting to run a script.
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mitre_attack_id:
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- T1218
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nist:
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- DE.CM
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observable:
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- name: dest_device_id
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type: Hostname
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role:
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- Victim
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- name: dest_user_id
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type: User
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role:
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- Victim
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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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product:
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- Splunk Behavioral Analytics
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required_fields:
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- _time
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- dest_device_id
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- process_name
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- parent_process_name
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- process_path
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- dest_user_id
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- process
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- cmd_line
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risk_score: 49
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security_domain: endpoint
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asset_type: Endpoint
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