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Patrick
85 lines
3.4 KiB
YAML
85 lines
3.4 KiB
YAML
name: Sdelete Application Execution
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id: 31702fc0-2682-11ec-85c3-acde48001122
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version: 2
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date: '2024-05-23'
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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 execution of the sdelete.exe application,
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a Sysinternals tool often used by adversaries to securely delete files and remove
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forensic evidence from a targeted host. This detection leverages data from Endpoint
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Detection and Response (EDR) agents, focusing on process execution logs. Monitoring
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this activity is crucial as sdelete.exe is not commonly used in regular operations
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and its presence may indicate an attempt to cover malicious activities. If confirmed
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malicious, this could lead to the loss of critical forensic data, hindering incident
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response and investigation efforts.
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data_source:
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- Sysmon EventID 1
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- Windows Event Log Security 4688
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- CrowdStrike ProcessRollup2
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search: '| tstats `security_content_summariesonly` values(Processes.process) as process
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values(Processes.parent_process) as parent_process values(Processes.process_id)
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as process_id count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
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where `process_sdelete` by Processes.process_name Processes.original_file_name
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Processes.dest Processes.user Processes.parent_process_name Processes.parent_process
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `sdelete_application_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: user may execute and use this application
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references:
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- https://app.any.run/tasks/956f50be-2c13-465a-ac00-6224c14c5f89/
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tags:
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analytic_story:
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- Masquerading - Rename System Utilities
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: sdelete process $process_name$ executed in $dest$
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mitre_attack_id:
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- T1485
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- T1070.004
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- T1070
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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- name: user
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type: User
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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.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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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:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1485/sdelete/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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