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P4T12ICK
60 lines
2.2 KiB
YAML
60 lines
2.2 KiB
YAML
name: Malicious PowerShell Process With Obfuscation Techniques
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id: cde75cf6-3c7a-4dd6-af01-27cdb4511fd4
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version: 4
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date: '2021-01-19'
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author: David Dorsey, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: This search looks for PowerShell processes launched with arguments that
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have characters indicative of obfuscation on the command-line.
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search: '| tstats `security_content_summariesonly` count values(Processes.process)
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as process values(Processes.parent_process) as parent_process min(_time) as firstTime
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max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name=powershell.exe
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by Processes.user Processes.process_name Processes.parent_process_name Processes.dest
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Processes.process | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`|
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`security_content_ctime(lastTime)`| eval num_obfuscation = (mvcount(split(process,"`"))-1)
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+ (mvcount(split(process, "^"))-1) + (mvcount(split(process, "''"))-1) | `malicious_powershell_process_with_obfuscation_techniques_filter`
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| search num_obfuscation > 10 '
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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: These characters might be legitimately on the command-line,
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but it is not common.
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references: []
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tags:
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analytic_story:
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- Malicious PowerShell
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asset_type: Endpoint
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automated_detection_testing: passed
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cis20:
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- CIS 3
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- CIS 7
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- CIS 8
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.001/obfuscated_powershell/windows-sysmon.log
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kill_chain_phases:
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- Command and Control
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- Actions on Objectives
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mitre_attack_id:
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- T1059.001
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nist:
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- PR.PT
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- DE.CM
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- PR.IP
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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.process
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- Processes.parent_process
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- Processes.process_name
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- Processes.user
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- Processes.parent_process_name
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- Processes.dest
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security_domain: endpoint
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