mirror of
https://github.com/splunk/security_content
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Bhavin Patel
76 lines
2.9 KiB
YAML
76 lines
2.9 KiB
YAML
name: Windows Terminating Lsass Process
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id: 7ab3c319-a4e7-4211-9e8c-40a049d0dba6
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version: 1
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date: '2023-04-14'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: This analytic is to detect a suspicious process terminating Lsass process.
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Lsass process is known to be a critical process that is responsible for enforcing
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security policy system. This process was commonly targetted by threat actor or red
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teamer to gain privilege escalation or persistence in the targeted machine because
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it handles credentials of the logon users. In this analytic we tried to detect a
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suspicious process having a granted access PROCESS_TERMINATE to lsass process to
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modify or delete protected registrys. This technique was seen in doublezero malware
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that tries to wipe files and registry in compromised hosts. This anomaly detection
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can be a good pivot of incident response for possible credential dumping or evading
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security policy in a host or network environment.
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data_source:
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- Sysmon Event ID 1
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search: '`sysmon` EventCode=10 TargetImage=*lsass.exe GrantedAccess = 0x1 | stats
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count min(_time) as firstTime max(_time) as lastTime by SourceImage, TargetImage,
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TargetProcessId, SourceProcessId, GrantedAccess CallTrace, dest | rename dest
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as dest | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `windows_terminating_lsass_process_filter`'
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how_to_implement: This search requires Sysmon Logs and a Sysmon configuration, which
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includes EventCode 10 for lsass.exe. This search uses an input macro named `sysmon`.
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We strongly recommend that you specify your environment-specific configurations
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(index, source, sourcetype, etc.) for Windows Sysmon logs. Replace the macro definition
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with configurations for your Splunk environment. The search also uses a post-filter
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macro designed to filter out known false positives.
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known_false_positives: unknown
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references:
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- https://blog.talosintelligence.com/2022/03/threat-advisory-doublezero.html
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tags:
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analytic_story:
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- Data Destruction
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- Double Zero Destructor
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asset_type: Endpoint
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confidence: 80
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impact: 80
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message: a process $SourceImage$ terminates Lsass process in $dest$
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mitre_attack_id:
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- T1562.001
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- T1562
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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- name: TargetImage
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type: Process
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role:
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- Target
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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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- EventCode
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- TargetImage
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- CallTrace
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- dest
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- TargetProcessId
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- SourceImage
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- SourceProcessId
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- GrantedAccess
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risk_score: 64
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/doublezero_wiper/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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