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https://github.com/splunk/security_content
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Gowthamaraj rajendran
79 lines
3.3 KiB
YAML
79 lines
3.3 KiB
YAML
name: SLUI Spawning a Process
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id: 879c4330-b3e0-11eb-b1b1-acde48001122
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version: 1
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date: '2021-05-13'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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description: The following analytic identifies the Microsoft Software Licensing User
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Interface Tool, `slui.exe`, spawning a child process. This behavior is associated
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with publicly known UAC bypass. `slui.exe` is commonly associated with software
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updates and is most often spawned by `svchost.exe`. The `slui.exe` process should
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not have child processes, and any processes spawning from it will be running with
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elevated privileges. During triage, review the child process and additional parallel
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processes. Identify any file modifications that may have lead to the bypass.
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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 Processes.parent_process_name=slui.exe
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by Processes.dest Processes.user Processes.parent_process Processes.process_name
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Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `slui_spawning_a_process_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: Certain applications may spawn from `slui.exe` that are legitimate.
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Filtering will be needed to ensure proper monitoring.
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references:
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- https://www.exploit-db.com/exploits/46998
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- https://www.rapid7.com/db/modules/exploit/windows/local/bypassuac_sluihijack/
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- https://www.mandiant.com/resources/shining-a-light-on-darkside-ransomware-operations
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tags:
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analytic_story:
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- DarkSide Ransomware
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- Windows Defense Evasion Tactics
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asset_type: Endpoint
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confidence: 90
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impact: 70
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message: A slui process $parent_process_name$ spawning child process $process_name$
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in host $dest$
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mitre_attack_id:
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- T1548.002
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- T1548
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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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- 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
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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_id
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risk_score: 63
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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/T1548.002/slui/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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