mirror of
https://github.com/splunk/security_content
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Bhavin Patel
76 lines
3.2 KiB
YAML
76 lines
3.2 KiB
YAML
name: Disable Logs Using WevtUtil
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id: 236e7c8e-c9d9-11eb-a824-acde48001122
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version: 2
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date: '2024-05-13'
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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 "wevtutil.exe" with parameters
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to disable event logs. It leverages data from Endpoint Detection and Response (EDR)
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agents, focusing on process names and command-line arguments. This activity is significant
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because disabling event logs is a common tactic used by ransomware to evade detection
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and hinder forensic investigations. If confirmed malicious, this action could allow
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attackers to operate undetected, making it difficult to trace their activities and
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respond effectively to the incident.
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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.process_name = "wevtutil.exe"
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Processes.process = "*sl*" Processes.process = "*/e:false*" by Processes.parent_process_name
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Processes.parent_process Processes.process_name Processes.process Processes.dest
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Processes.user Processes.process_id Processes.process_guid | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `disable_logs_using_wevtutil_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: network operator may disable audit event logs for debugging
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purposes.
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references:
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- https://www.bleepingcomputer.com/news/security/new-ransom-x-ransomware-used-in-texas-txdot-cyberattack/
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tags:
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analytic_story:
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- Ransomware
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- CISA AA23-347A
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- Rhysida Ransomware
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asset_type: Endpoint
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confidence: 80
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impact: 30
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message: WevtUtil.exe used to disable Event Logging on $dest
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mitre_attack_id:
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- T1070
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- T1070.001
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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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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.parent_process_name
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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.dest
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- Processes.user
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- Processes.process_id
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- Processes.process_guid
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risk_score: 24
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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/malware/ransomware_ttp/data1/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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