mirror of
https://github.com/splunk/security_content
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divious1
111 lines
3.6 KiB
YAML
111 lines
3.6 KiB
YAML
asset_type: ''
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confidence: medium
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creation_date: '2017-08-23'
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data_metadata:
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data_models:
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- Endpoint
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data_source:
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- Endpoint Intel
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providing_technologies:
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- Carbon Black Response
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- CrowdStrike Falcon
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- Sysmon
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- Tanium
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- Ziften
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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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detect:
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splunk:
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correlation_rule:
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notable:
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nes_fields: dest, process, user
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rule_description: An unusually long command line $cmdline$ was found on $dest$
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rule_title: Unusually Long Command Line on $dest$
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risk:
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risk_object: dest
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risk_object_type:
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- system
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risk_score: 50
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schedule:
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cron_schedule: 0 * * * *
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earliest_time: -1d@d
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latest_time: -10m@m
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as
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lastTime FROM datamodel=Endpoint.Processes by Processes.user Processes.dest
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Processes.process_name Processes.process | `drop_dm_object_name("Processes")`
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| `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)`| eval processlen=len(process) | eventstats
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stdev(processlen) as stdev, avg(processlen) as avg by dest | stats max(processlen)
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as maxlen, values(stdev) as stdevperhost, values(avg) as avgperhost by dest,
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user, process_name, process| eval threshold = 10 | where maxlen > ((threshold*stdevperhost)
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+ avgperhost)'
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suppress:
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suppress_fields: dest,user,process
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suppress_period: 28800s
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eli5: This search calculates the average and standard deviation for the length of
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the command lines on each of your endpoints and alerts when it detects a command
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line with a length over 10 times the standard deviation larger than the average
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command line.
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entities:
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- dest
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- process_name
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- user
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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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id: c77162d3-f93c-45cc-80c8-22f6a4264e7f
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investigations:
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- id: bc91a8cf-35e7-4bb2-8140-e756cc06fd76
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name: Get Authentication Logs For Endpoint
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type: splunk
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- id: fecf2918-670d-4f1c-872b-3d7317a41bf9
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name: Get Parent Process Info
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type: splunk
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- id: fdcfb369-1725-4c24-824a-22972d7f0d55
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name: Get Risk Modifiers For User
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type: splunk
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- id: bc91a8cf-35e7-4bb2-8140-e756cc06fd71
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name: Get Process Info
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type: splunk
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- id: 3d6c3213-5fff-4a1e-b57d-b24c262171e7
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name: Get Notable History
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type: splunk
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- id: f3fb4d1b-5f33-4b01-b541-c7af9534c242
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name: Get Notable Info
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type: splunk
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- id: fdcfb369-1725-4c24-824a-22972d7f0d65
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name: Get Risk Modifiers For Endpoint
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type: splunk
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- id: bc91a8cf-35e7-4bb2-8140-e756cc06fd74
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name: Get User Information from Identity Table
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type: splunk
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- id: bc91a8cf-35e7-4bb2-8140-e756cc06fd22
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name: Investigate Web Activity From Host
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type: splunk
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known_false_positives: Some legitimate applications start with long command lines.
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maintainers:
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- company: Splunk
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email: bpatel@splunk.com
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name: Bhavin Patel
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mappings:
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cis20:
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- CIS 8
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kill_chain_phases:
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- Actions on Objectives
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mitre_attack:
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- Execution
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nist:
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- PR.PT
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- DE.CM
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modification_date: '2019-02-28'
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name: Unusually Long Command Line
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original_authors:
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- company: Splunk
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email: davidd@splunk.com
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name: David Dorsey
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references: []
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security_domain: endpoint
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spec_version: 2
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type: splunk
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version: '3.0'
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