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https://github.com/splunk/security_content
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Patrick Bareiss
38 lines
1.6 KiB
YAML
38 lines
1.6 KiB
YAML
name: Unusually Long Command Line
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id: c77162d3-f93c-45cc-80c8-22f6a4264e7f
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version: 4
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date: '2020-03-16'
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description: Command lines that are extremely long may be indicative of malicious
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activity on your hosts.
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how_to_implement: You must be ingesting endpoint data that tracks process activity,
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including parent-child relationships, from your endpoints to populate the Endpoint
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data model in the Processes node. The command-line arguments are mapped to the "process"
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field in the Endpoint data model.
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type: ESCU
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references: []
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author: David Dorsey, Splunk
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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 by Processes.user Processes.dest Processes.process_name
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Processes.process | `drop_dm_object_name("Processes")` | `security_content_ctime(firstTime)`|
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`security_content_ctime(lastTime)`| eval processlen=len(process) | eventstats stdev(processlen)
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as stdev, avg(processlen) as avg by dest | stats max(processlen) as maxlen, values(stdev)
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as stdevperhost, values(avg) as avgperhost by dest, user, process_name, process|
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`unusually_long_command_line_filter` eval threshold = 10 | where maxlen > ((threshold*stdevperhost)
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+ avgperhost)'
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known_false_positives: Some legitimate applications start with long command lines.
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tags:
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analytics_story:
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- Ransomware
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- Suspicious Command-Line Executions
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- Possible Backdoor Activity Associated With MUDCARP Espionage Campaigns
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- Unusual Processes
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kill_chain_phases:
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- Actions on Objectives
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cis20:
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- CIS 8
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nist:
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- PR.PT
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- DE.CM
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security_domain: endpoint
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asset_type: ''
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