mirror of
https://github.com/splunk/security_content
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divious1
108 lines
3.5 KiB
YAML
108 lines
3.5 KiB
YAML
asset_type: Endpoint
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confidence: high
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creation_date: '2018-01-26'
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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: This search looks for processes launched from files that have double
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extensions in the file name. This is typically done to obscure the "real" file extension
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and make it appear as though the file being accessed is a data file, as opposed
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to executable content.
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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
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rule_description: The system $dest$ executed a file with a double extension.
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rule_title: Process With Multiple Extensions Launched 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: 60
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schedule:
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cron_schedule: 0 * * * *
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earliest_time: -70m@m
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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 where Processes.process = *.doc.exe
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OR Processes.process = *.htm.exe OR Processes.process = *.html.exe OR Processes.process
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= *.txt.exe OR Processes.process = *.pdf.exe OR Processes.process = *.doc.exe
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by Processes.dest Processes.user Processes.process Processes.parent_process
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `drop_dm_object_name(Processes)`'
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suppress:
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suppress_fields: dest, process
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suppress_period: 28800s
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eli5: This search uses the "Application State" data model to look for process names
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with specific combinations of double extensions. Relatively straightforward, the
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search looks for strings in the "process" field that match what you're looking for.
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entities:
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- dest
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how_to_implement: To successfully implement this search, you must be ingesting data
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that records process activity from your hosts to populate the endpoint data model
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in the processes node.
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id: b06a555e-dce0-417d-a2eb-28a5d8d66ef7
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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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known_false_positives: None identified.
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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 3
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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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- Persistence
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- Change Default File Association
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nist:
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- DE.CM
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- PR.PT
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- PR.IP
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modification_date: '2018-11-02'
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name: Execution of File with Multiple Extensions
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original_authors:
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- company: Splunk
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email: rvaldez@splunk.com
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name: Rico Valdez
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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: '1.0'
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