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P4T12ICK
57 lines
2.0 KiB
YAML
57 lines
2.0 KiB
YAML
name: Unusually Long Command Line
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id: c77162d3-f93c-45cc-80c8-22f6a4264e7f
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version: 5
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date: '2020-12-08'
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author: David Dorsey, Splunk
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status: experimental
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type: Anomaly
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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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data_source:
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- Sysmon Event ID 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 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 = 3 | where maxlen > ((threshold*stdevperhost)
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+ avgperhost)'
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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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known_false_positives: Some legitimate applications start with long command lines.
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references: []
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tags:
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analytic_story:
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- Suspicious Command-Line Executions
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- Unusual Processes
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- Possible Backdoor Activity Associated With MUDCARP Espionage Campaigns
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- Ransomware
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asset_type: Endpoint
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confidence: 60
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impact: 70
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message: Unusually long command line $Processes.process_name$ on $dest$
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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: Processes.process_name
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type: Process
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role:
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- Attacker
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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.user
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- Processes.dest
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- Processes.process_name
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- Processes.process
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risk_score: 42
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security_domain: endpoint
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