mirror of
https://github.com/splunk/security_content
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divious1
107 lines
4.1 KiB
YAML
107 lines
4.1 KiB
YAML
asset_type: Endpoint
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confidence: low
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creation_date: '2017-08-03'
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data_metadata:
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data_models:
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- Change_Analysis
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data_source:
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- Windows Security Audit logs
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providing_technologies:
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- Microsoft Windows
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description: The search is used to detect hosts that generate Windows Event ID 4663
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for successful attempts to write to or read from a removable storage and Event ID
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4656 for failures, which occurs when a USB drive is plugged in. In this scenario
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we are querying the Change_Analysis data model to look for Windows Event ID 4656
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or 4663 where the priority of the affected host is marked as high in the ES Assets
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and Identity Framework.
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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
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rule_description: Read/Write attempt to a USB was detected on this host
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rule_title: Read/Write attempt to a USB detected 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: 20
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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 earliest(_time) AS earliest latest(_time)
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AS latest from datamodel=Change_Analysis where (nodename = All_Changes) All_Changes.result="Removable
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Storage device" (All_Changes.result_id=4663 OR All_Changes.result_id=4656)
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(All_Changes.src_priority=high) by All_Changes.dest | `drop_dm_object_name("All_Changes")`|
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`security_content_ctime(earliest)`| `security_content_ctime(latest)` '
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suppress:
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suppress_fields: dest
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suppress_period: 86400s
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eli5: USB is a common attack vector for delivering or propagating malicious code,
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or the exfiltration of data. Your corporation may have a policy of not allowing
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removable media at all, or may only allow approved media to be used on specific
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hosts by specific users. By logging USB activity from Windows and other endpoints
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gathered using the Universal Forwarder, you can gain an understanding of what systems
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might be vulnerable to attack via removable media, or what users might need additional
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security training. This search is looking for event_id 4656 for failure and 4663
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for successful USB read/write attempts from Windows Security Event logs, which is
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the event code generated when a files are read from and written to a removable storage
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device
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entities:
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- dest
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how_to_implement: To successfully implement this search, you must ingest Windows Security
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Event logs and track event code 4663 and 4656. Ensure that the field from the event
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logs is being mapped to the result_id field in the Change_Analysis data model. To
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minimize the alert volume, this search leverages the Assets and Identity framework
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to filter out events from those assets not marked high priority in the Enterprise
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Security Assets and Identity Framework.
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id: 104658f4-afdc-499f-9719-17a43f9826f5
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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: 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: 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: Legitimate USB activity will also be detected. Please verify
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and investigate as appropriate.
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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 13
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kill_chain_phases:
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- Installation
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- Actions on Objectives
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mitre_attack:
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- Exfiltration
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nist:
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- PR.PT
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- PR.DS
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modification_date: '2017-11-27'
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name: Detect USB device insertion
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original_authors:
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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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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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