mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
divious1
114 lines
4.2 KiB
YAML
114 lines
4.2 KiB
YAML
asset_type: Windows
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confidence: medium
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creation_date: '2018-08-28'
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data_metadata:
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data_eventtypes:
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- wineventlog_security
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data_source:
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- Windows Event Logs
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providing_technologies:
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- Microsoft Windows
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description: This search looks for PowerShell requesting privileges consistent with
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credential dumping.
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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: user, dest
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rule_description: Possible attempt at credential dumping via PowerShell was
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detected on $dest$ by $user$.
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rule_title: Event Code 4703 Specifying PowerShell Acquiring A Token with SeDebugPrivilege
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Identified 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: 40
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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: eventtype=wineventlog_security signature_id=4703 Process_Name=*powershell.exe
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| rex field=Message "Enabled Privileges:\s+(?<privs>\w+)\s+Disabled Privileges:"
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| where privs="SeDebugPrivilege" | stats count min(_time) as firstTime max(_time)
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as lastTime by dest, Process_Name, privs, Process_ID, Message | rename privs
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as "Enabled Privilege" | rename Process_Name as process | `security_content_ctime(firstTime)`|
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`security_content_ctime(lastTime)`
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suppress:
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suppress_fields: user, dest, process
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suppress_period: 86400s
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eli5: This search looks for Windows Event Code(signature_id) 4703 (token right adjusted),
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where the process requesting the token change is PowerShell.exe and the requested
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privilege is "SeDebugPrivilege". This is consistent with the use of PowerShell to
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execute Mimikatz using sekurlsa::logonpasswords. It will return the host where the
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activity occurred, the process and associated id, the enabled privilege, and the
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message in the event.
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entities:
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- dest
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how_to_implement: 'You must be ingesting Windows Security logs. You must also enable
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the account change auditing here: http://docs.splunk.com/Documentation/Splunk/7.0.2/Data/MonitorWindowseventlogdata.
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Additionally, this search requires you to enable your Group Management Audit Logs
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in your Local Windows Security Policy and to be ingesting those logs. More information
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on how to enable them can be found here: http://whatevernetworks.com/auditing-group-membership-changes-in-active-directory/.
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Finally, please make sure that the local administrator group name is "Administrators"
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to be able to look for the right group membership changes.'
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id: 98917be2-bfc8-475a-8618-a9bb06575188
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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: The activity may be legitimate. PowerShell is often used by
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administrators to perform various tasks, and it's possible this event could be generated
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in those cases. In these cases, false positives should be fairly obvious and you
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may need to tweak the search to eliminate noise.
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maintainers:
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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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mappings:
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cis20:
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- CIS 3
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- CIS 5
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- CIS 16
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kill_chain_phases:
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- Actions on Objectives
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mitre_attack:
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- Credential Access
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- Credential Dumping
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nist:
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- PR.IP
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- PR.AC
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- DE.CM
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modification_date: '2019-02-27'
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name: Detect Mimikatz Via PowerShell And EventCode 4703
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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: access
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spec_version: 2
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type: splunk
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version: '2.0'
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