mirror of
https://github.com/splunk/security_content
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divious1
109 lines
3.7 KiB
YAML
109 lines
3.7 KiB
YAML
asset_type: Endpoint
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confidence: high
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creation_date: '2017-08-21'
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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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description: The search looks for files created with names matching those typically
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used in ransomware notes that tell the victim how to get their data back.
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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, file_name
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rule_description: A file modification associated with a ransomware victim
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notification file detected on $dest$
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rule_title: Ransomware Note File 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: 80
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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 values(Filesystem.user) as user values(Filesystem.dest) as dest values(Filesystem.file_path)
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as file_path from datamodel=Endpoint.Filesystem by Filesystem.file_name |
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`drop_dm_object_name(Filesystem)` | `security_content_ctime(lastTime)` | `security_content_ctime(firstTime)`|`ransomware_notes`'
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suppress:
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suppress_fields: dest,file_name
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suppress_period: 14400s
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eli5: This search looks at file modifications in the Change Analysis data model. It
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checks modified file names against an included lookup file, which contains the names
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of note files left behind by ransomware (to inform the victim how they can pay the
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ransom and retrieve their files). The search returns a list of files with matching
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names.
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entities:
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- dest
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how_to_implement: You must be ingesting data that records file-system activity from
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your hosts to populate the Endpoint Filesystem data-model node. This is typically
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populated via endpoint detection-and-response products, such as Carbon Black, or
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via other endpoint data sources, such as Sysmon. The data used for this search is
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typically generated via logs that report file-system reads and writes.
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id: ada0f478-84a8-4641-a3f1-d82362d6bd71
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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: d98675ed-da43-4a7e-96a7-eeca3232ba8e
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name: Get Update Logs For Endpoint
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type: splunk
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- id: df7a7f50-30f2-4cde-8448-69d2d5f9b3c5
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name: Get Vulnerability Logs 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: 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: 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: fdcfb369-1725-4c24-824a-22972d7f0d44
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name: Get Backup Logs For Endpoint
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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: It's possible that a legitimate file could be created with
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the same name used by ransomware note files.
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maintainers:
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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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- 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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nist:
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- PR.PT
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- DE.CM
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modification_date: '2018-11-15'
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name: Common Ransomware Notes
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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: '2.0'
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