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Michael Haag
89 lines
3.2 KiB
YAML
89 lines
3.2 KiB
YAML
name: Detect Renamed PSExec
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id: 683e6196-b8e8-11eb-9a79-acde48001122
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version: 4
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date: '2022-04-07'
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author: Michael Haag, Splunk
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type: Hunting
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datamodel:
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- Endpoint
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description: The following analytic identifies renamed instances of `PsExec.exe` being
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utilized on an endpoint. Most instances, it is highly probable to capture `Psexec.exe`
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or other SysInternal utility usage with the command-line argument of `-accepteula`.
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During triage, validate this is the legitimate version of `PsExec` by reviewing
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the PE metadata. In addition, review parallel processes for further suspicious behavior.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where (Processes.process_name!=psexec.exe OR Processes.process_name!=psexec64.exe) AND Processes.original_file_name=psexec.c by Processes.dest
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Processes.user Processes.parent_process_name Processes.process_name Processes.process
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Processes.process_id Processes.parent_process_id Processes.original_file_name |
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`drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `detect_renamed_psexec_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: Limited false positives should be present. It is possible some
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third party applications may use older versions of PsExec, filter as needed.
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references:
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1569.002/T1569.002.yaml
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- https://redcanary.com/blog/threat-hunting-psexec-lateral-movement/
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tags:
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analytic_story:
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- SamSam Ransomware
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- DHS Report TA18-074A
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- HAFNIUM Group
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- DarkSide Ransomware
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- Active Directory Lateral Movement
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- CISA AA22-320A
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confidence: 90
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context:
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- Source:Endpoint
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- Stage:Collection
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1569.002/atomic_red_team/windows-sysmon.log
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impact: 30
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kill_chain_phases:
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- Exploitation
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message: The following $process_name$ has been identified as renamed, spawning from
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$parent_process_name$ on $dest$ by $user$.
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mitre_attack_id:
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- T1569
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- T1569.002
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observable:
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- name: user
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type: User
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role:
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- Victim
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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: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 27
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security_domain: endpoint
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asset_type: Endpoint
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