mirror of
https://github.com/splunk/security_content
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Bhavin Patel
83 lines
3.8 KiB
YAML
83 lines
3.8 KiB
YAML
name: Unknown Process Using The Kerberos Protocol
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id: c91a0852-9fbb-11ec-af44-acde48001122
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version: 3
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date: '2024-05-19'
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author: Mauricio Velazco, Splunk
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status: production
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type: TTP
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description: The following analytic identifies a non-lsass.exe process making an outbound
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connection on port 88, which is typically used by the Kerberos authentication protocol.
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This detection leverages data from Endpoint Detection and Response (EDR) agents,
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focusing on process and network traffic logs. This activity is significant because,
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under normal circumstances, only the lsass.exe process should interact with the
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Kerberos Distribution Center. If confirmed malicious, this behavior could indicate
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an adversary attempting to abuse the Kerberos protocol, potentially leading to unauthorized
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access or lateral movement within the network.
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data_source:
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- Sysmon EventID 1
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search: '| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes
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where Processes.process_name!=lsass.exe by _time Processes.process_id Processes.process_name
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Processes.dest Processes.process_path Processes.process Processes.parent_process_name
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| join process_id dest [| tstats `security_content_summariesonly` count FROM datamodel=Network_Traffic.All_Traffic
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where All_Traffic.dest_port = 88 by All_Traffic.src All_Traffic.process_id All_Traffic.dest_port
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| `drop_dm_object_name(All_Traffic)` | rename src as dest ] | table _time dest
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parent_process_name process_name process_path process process_id dest_port | `unknown_process_using_the_kerberos_protocol_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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known_false_positives: Custom applications may leverage the Kerberos protocol. Filter
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as needed.
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references:
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- https://stealthbits.com/blog/how-to-detect-overpass-the-hash-attacks/
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- https://www.thehacker.recipes/ad/movement/kerberos/ptk
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tags:
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analytic_story:
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- Active Directory Kerberos Attacks
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asset_type: Endpoint
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confidence: 60
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impact: 60
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message: Unknown process $process_name$ using the kerberos protocol detected on
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host $dest$
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mitre_attack_id:
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- T1550
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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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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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- All_Traffic.dest_ip
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- All_Traffic.dest_port
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- All_Traffic.src_ip
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- Processes.process_id
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- Processes.process_name
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- Processes.dest
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- Processes.process_path
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- Processes.process
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- Processes.parent_process_name
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risk_score: 36
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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:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1550/rubeus/windows-security.log
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source: WinEventLog:Security
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sourcetype: WinEventLog
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1550/rubeus/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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