mirror of
https://github.com/splunk/security_content
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divious1
107 lines
3.7 KiB
YAML
107 lines
3.7 KiB
YAML
asset_type: Endpoint
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confidence: high
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creation_date: '2017-06-07'
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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 modifications to the hosts file on all Windows endpoints
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across your environment.
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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 was noted for the hosts file on $dest$.
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rule_title: Modification of hosts 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 FROM datamodel=Endpoint.Filesystem by Filesystem.file_name Filesystem.file_path
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Filesystem.dest | `security_content_ctime(lastTime)` | `security_content_ctime(firstTime)` | search Filesystem.file_name=hosts
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AND Filesystem.file_path=*Windows\\System32\\* | `drop_dm_object_name(Filesystem)`'
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suppress:
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suppress_fields: dest,user
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suppress_period: 86400s
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eli5: The hosts file is present on both Windows and Linux endpoints. The purpose of
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the hosts file is to provide a mapping between hostnames and IP addresses, the same
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way DNS is used to provide such a mapping. However, the information in the hosts
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file takes precedence over information received via DNS and a DNS query will not
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be issued if the hostname of interest is found in the hosts file. As such, attackers
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have been observed adding entries to the host file to override any DNS resolution.
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For this reason, it is useful to monitor for changes to this file, which typically
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do not occur very often in legitimate cases.
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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 the file-system activity from your hosts to populate the Endpoint.Filesystem
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data model node. This is typically populated via endpoint detection-and-response
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products, such as Carbon Black, or by other endpoint data sources, such as Sysmon.
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The data used for this search is typically generated via logs that report file-system
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reads and writes.
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id: 06a6fc63-a72d-41dc-8736-7e3dd9612116
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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: There may be legitimate reasons for system administrators to
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add entries to this file.
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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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- CIS 12
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kill_chain_phases:
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- Command and Control
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mitre_attack:
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- Command and Control
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- Exfiltration
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nist:
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- PR.IP
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- PR.PT
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- PR.AC
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- DE.AE
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- DE.CM
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modification_date: '2018-11-02'
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name: Windows hosts file modification
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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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