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https://github.com/splunk/security_content
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Bhavin Patel
79 lines
3.4 KiB
YAML
79 lines
3.4 KiB
YAML
name: Windows System LogOff Commandline
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id: 74a8133f-93e7-4b71-9bd3-13a66124fd57
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version: 1
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date: '2022-07-27'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: The following analytic identifies Windows commandline to logoff a windows
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host machine. This technique was seen in several APT, RAT like dcrat and other commodity
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malware to shutdown the machine to add more impact, interrupt access, aid destruction
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of the system like wiping disk or inhibit system recovery. This TTP is a good pivot
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to check why application trigger this commandline which is not so common way to
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logoff a machine.
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data_source:
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- Sysmon Event ID 1
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search: '| tstats `security_content_summariesonly` values(Processes.process) as process
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min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
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where (Processes.process_name = shutdown.exe OR Processes.original_file_name = shutdown.exe)
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Processes.process="*shutdown*" Processes.process IN ("* /l*", "* -l*") Processes.process IN ("* /t*","* -t*","* /f*","* -f*")
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by Processes.dest Processes.user Processes.parent_process Processes.process_name
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Processes.original_file_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_system_logoff_commandline_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: Administrator may execute this commandline to trigger shutdown,
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logoff or restart the host machine.
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references:
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- https://attack.mitre.org/techniques/T1529/
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- https://www.mandiant.com/resources/analyzing-dark-crystal-rat-backdoor
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tags:
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analytic_story:
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- DarkCrystal RAT
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- NjRAT
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asset_type: Endpoint
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confidence: 80
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impact: 70
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message: Process name $process_name$ is seen to execute logoff commandline on $dest$
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mitre_attack_id:
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- T1529
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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.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: 56
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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/malware/dcrat/reboot_logoff_commandline/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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update_timestamp: true
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