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51 lines
2.0 KiB
YAML
51 lines
2.0 KiB
YAML
name: Disable Logs Using WevtUtil
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id: 236e7c8e-c9d9-11eb-a824-acde48001122
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version: 1
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date: '2021-06-10'
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author: Teoderick Contreras, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: This search is to detect execution of wevtutil.exe to disable logs. This
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technique was seen in several ransomware to disable the event logs to evade alerts
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and detections.
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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: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA.
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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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automated_detection_testing: passed
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dataset:
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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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kill_chain_phases:
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- Exploitation
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mitre_attack_id:
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- T1070.001
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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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security_domain: endpoint
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