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https://github.com/splunk/security_content
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pyth0n1c
82 lines
2.7 KiB
YAML
82 lines
2.7 KiB
YAML
name: Suspicious wevtutil Usage
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id: 2827c0fd-e1be-4868-ae25-59d28e0f9d4f
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version: 4
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date: '2021-10-11'
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author: David Dorsey, Michael Haag, Splunk
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type: TTP
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datamodel:
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- Endpoint.Processes
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description: The wevtutil.exe application is the windows event log utility. This searches
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for wevtutil.exe with parameters for clearing the application, security, setup,
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trace or system event logs.
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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=wevtutil.exe Processes.process IN ("* cl *", "*clear-log*")
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(Processes.process="*System*" OR Processes.process="*Security*" OR Processes.process="*Setup*"
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OR Processes.process="*Application*" OR Processes.process="*trace*") by Processes.process_name
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Processes.parent_process_name Processes.dest Processes.user| `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` |`security_content_ctime(lastTime)` | `suspicious_wevtutil_usage_filter`'
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how_to_implement: You must be ingesting data that records process activity from your
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hosts to populate the Endpoint data model in the Processes node. You must also be
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ingesting logs with both the process name and command line from your endpoints.
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The command-line arguments are mapped to the "process" field in the Endpoint data
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model.
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known_false_positives: The wevtutil.exe application is a legitimate Windows event
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log utility. Administrators may use it to manage Windows event logs.
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references:
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1070.001/T1070.001.md
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tags:
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analytic_story:
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- Windows Log Manipulation
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- Ransomware
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- Clop Ransomware
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automated_detection_testing: passed
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cis20:
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- CIS 3
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- CIS 5
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- CIS 6
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1070.001/atomic_red_team/windows-sysmon.log
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impact: 40
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kill_chain_phases:
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- Actions on Objectives
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message: Wevtutil.exe being used to clear Event Logs on $dest$ by $user$
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mitre_attack_id:
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- T1070.001
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- T1070
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nist:
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- DE.DP
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- PR.IP
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- PR.PT
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- PR.AC
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- PR.AT
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- DE.AE
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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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- 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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- Endpoint.Processes.dest
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- Endpoint.Processes.parent_process_name
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- Endpoint.Processes.process
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- Endpoint.Processes.process_name
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- Endpoint.Processes.user
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- _time
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risk_score: 28
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security_domain: endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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