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https://github.com/splunk/security_content
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Bhavin Patel
82 lines
3.4 KiB
YAML
82 lines
3.4 KiB
YAML
name: SLUI Spawning a Process
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id: 879c4330-b3e0-11eb-b1b1-acde48001122
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version: 2
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date: '2024-05-18'
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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 detects the Microsoft Software Licensing User
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Interface Tool (`slui.exe`) spawning a child process. This behavior is identified
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using Endpoint Detection and Response (EDR) telemetry, focusing on process creation
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events where `slui.exe` is the parent process. This activity is significant because
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`slui.exe` should not typically spawn child processes, and doing so may indicate
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a UAC bypass attempt, leading to elevated privileges. If confirmed malicious, an
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attacker could leverage this to execute code with elevated privileges, potentially
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compromising the system's security and gaining unauthorized access.
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data_source:
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- Sysmon EventID 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_name 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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| `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:
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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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