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tccontre
70 lines
2.5 KiB
YAML
70 lines
2.5 KiB
YAML
name: Shim Database File Creation
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id: 6e4c4588-ba2f-42fa-97e6-9f6f548eaa33
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version: 3
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date: '2020-12-08'
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author: David Dorsey, Splunk
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type: TTP
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datamodel: []
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description: This search looks for shim database files being written to default directories.
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The sdbinst.exe application is used to install shim database files (.sdb). According
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to Microsoft, a shim is a small library that transparently intercepts an API, changes
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the parameters passed, handles the operation itself, or redirects the operation
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elsewhere.
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search: '| tstats `security_content_summariesonly` count values(Filesystem.action)
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values(Filesystem.file_hash) as file_hash values(Filesystem.file_path) as file_path min(_time)
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as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Filesystem where Filesystem.file_path=*Windows\\AppPatch\\Custom*
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by Filesystem.file_name Filesystem.dest | `security_content_ctime(lastTime)` | `security_content_ctime(firstTime)`
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|`drop_dm_object_name(Filesystem)` | `shim_database_file_creation_filter`'
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how_to_implement: You must be ingesting data that records the filesystem activity
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from your hosts to populate the Endpoint file-system data model node. If you are
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using Sysmon, you will need a Splunk Universal Forwarder on each endpoint from which
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you want to collect data.
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known_false_positives: Because legitimate shim files are created and used all the
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time, this event, in itself, is not suspicious. However, if there are other correlating
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events, it may warrant further investigation.
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references: []
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tags:
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analytic_story:
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- Windows Persistence Techniques
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asset_type: Endpoint
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automated_detection_testing: passed
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cis20:
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- CIS 8
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confidence: 80
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context:
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- source:endpoint
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- stage: Privilege Escalation
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- Persistence
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1546.011/atomic_red_team/windows-sysmon.log
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impact: 70
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kill_chain_phases:
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- Actions on Objectives
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message: A process that possibly write shim database in $file_path$ in host $dest$
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mitre_attack_id:
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- T1546.011
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- T1546
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nist:
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- DE.CM
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observable:
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: file_path
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type: file path
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role:
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- Others
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Filesystem.file_hash
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- Filesystem.file_path
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- Filesystem.file_name
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- Filesystem.dest
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risk_score: 56
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security_domain: endpoint
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