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Description

The detection Detect Path Interception By Creation Of program exe is detecting the abuse of unquoted service paths, which is a popular technique for privilege escalation.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint- Datasource: Splunk Add-on for Sysmon
  • Last Updated: 2020-07-03
  • Author: Patrick Bareiss, Splunk
  • ID: cbef820c-e1ff-407f-887f-0a9240a2d477

Annotations

ATT&CK
ID Technique Tactic
T1574.009 Path Interception by Unquoted Path Defense Evasion, Persistence, Privilege Escalation
T1574 Hijack Execution Flow Defense Evasion, Persistence, Privilege Escalation
Kill Chain Phase
  • Actions on Objectives
NIST
  • PR.PT
  • DE.CM
CIS20
  • CIS 8
CVE
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| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=services.exe by Processes.user Processes.process_name Processes.process Processes.dest 
| `drop_dm_object_name(Processes)` 
| rex field=process "^.*?\\\\(?<service_process>[^\\\\]*\.(?:exe
|bat
|com
|ps1))" 
| eval process_name = lower(process_name) 
| eval service_process = lower(service_process) 
| where process_name != service_process 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `detect_path_interception_by_creation_of_program_exe_filter`

Macros

The SPL above uses the following Macros:

Note that detect_path_interception_by_creation_of_program_exe_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

  • _time
  • Processes.dest
  • Processes.user
  • Processes.parent_process_name
  • Processes.parent_process
  • Processes.original_file_name
  • Processes.process_name
  • Processes.process
  • Processes.process_id
  • Processes.parent_process_path
  • Processes.process_path
  • Processes.parent_process_id

How To Implement

You must be ingesting data that records process activity from your hosts to populate the Endpoint data model in the Processes node. You must also be ingesting logs with both the process name and command line from your endpoints. The command-line arguments are mapped to the “process” field in the Endpoint data model.

Known False Positives

unknown

Associated Analytic story

RBA

Risk Score Impact Confidence Message
49.0 70 70 An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest$ by user $user$ attempting to perform privilege escalation by using unquoted service paths.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 3