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https://github.com/splunk/security_content
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P4T12ICK
84 lines
3.6 KiB
YAML
84 lines
3.6 KiB
YAML
name: Wsmprovhost LOLBAS Execution Process Spawn
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id: 2eed004c-4c0d-11ec-93e8-3e22fbd008af
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version: 1
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date: '2021-11-22'
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author: Mauricio Velazco, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: The following analytic identifies `Wsmprovhost.exe` spawning a LOLBAS
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execution process. When adversaries execute code on remote endpoints abusing the
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Windows Remote Management (WinRm) protocol, the executed command is spawned as a
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child processs of `Wsmprovhost.exe`. The LOLBAS project documents Windows native
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binaries that can be abused by threat actors to perform tasks like executing malicious
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code. Looking for child processes of Wsmprovhost.exe that are part of the LOLBAS
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project can help defenders identify lateral movement activity.
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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.parent_process_name=wsmprovhost.exe)
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(Processes.process_name IN ("Regsvcs.exe", "Ftp.exe", "OfflineScannerShell.exe",
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"Rasautou.exe", "Schtasks.exe", "Xwizard.exe", "Dllhost.exe", "Pnputil.exe", "Atbroker.exe",
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"Pcwrun.exe", "Ttdinject.exe","Mshta.exe", "Bitsadmin.exe", "Certoc.exe", "Ieexec.exe",
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"Microsoft.Workflow.Compiler.exe", "Runscripthelper.exe", "Forfiles.exe", "Msbuild.exe",
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"Register-cimprovider.exe", "Tttracer.exe", "Ie4uinit.exe", "Bash.exe", "Hh.exe",
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"SettingSyncHost.exe", "Cmstp.exe", "Mmc.exe", "Stordiag.exe", "Scriptrunner.exe",
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"Odbcconf.exe", "Extexport.exe", "Msdt.exe", "WorkFolders.exe", "Diskshadow.exe",
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"Mavinject.exe", "Regasm.exe", "Gpscript.exe", "Rundll32.exe", "Regsvr32.exe", "Msiexec.exe",
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"Wuauclt.exe", "Presentationhost.exe", "Wmic.exe", "Runonce.exe", "Syncappvpublishingserver.exe",
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"Verclsid.exe", "Infdefaultinstall.exe", "Explorer.exe", "Installutil.exe", "Netsh.exe",
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"Wab.exe", "Dnscmd.exe", "At.exe", "Pcalua.exe", "Msconfig.exe")) by Processes.dest
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Processes.user Processes.parent_process Processes.process_name Processes.process
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Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`| `wsmprovhost_lolbas_execution_process_spawn_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints.
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known_false_positives: Legitimate applications may trigger this behavior, filter as
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needed.
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references:
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- https://attack.mitre.org/techniques/T1021/006/
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- https://lolbas-project.github.io/
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- https://pentestlab.blog/2018/05/15/lateral-movement-winrm/
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tags:
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analytic_story:
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- Active Directory Lateral Movement
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confidence: 60
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context:
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- Source:Endpoint
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- Stage:Lateral Movement
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1021.006/lateral_movement_lolbas/windows-sysmon.log
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impact: 90
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kill_chain_phases:
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- Exploitation
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message: Wsmprovhost.exe spawned a LOLBAS process on $dest$.
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mitre_attack_id:
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- T1021
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- T1021.006
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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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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: 54
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security_domain: endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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asset_type: Endpoint
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