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Description

This search looks for child processes spawned by zoom.exe or zoom.us that has not previously been seen.

  • Type: Anomaly
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2020-05-20
  • Author: David Dorsey, Splunk
  • ID: e91bd102-d630-4e76-ab73-7e3ba22c5961

ATT&CK

ID Technique Tactic
T1068 Exploitation for Privilege Escalation Privilege Escalation

| tstats `security_content_summariesonly` min(_time) as firstTime values(Processes.parent_process_name) as parent_process_name values(Processes.parent_process_id) as parent_process_id values(Processes.process_name) as process_name values(Processes.process) as process from datamodel=Endpoint.Processes where (Processes.parent_process_name=zoom.exe OR Processes.parent_process_name=zoom.us) by Processes.process_id Processes.dest 
| `drop_dm_object_name(Processes)` 
| lookup zoom_first_time_child_process dest as dest process_name as process_name OUTPUT firstTimeSeen 
| where isnull(firstTimeSeen) OR firstTimeSeen > relative_time(now(), "`previously_seen_zoom_child_processes_window`") 
| `security_content_ctime(firstTime)` 
| table firstTime dest, process_id, process_name, parent_process_id, parent_process_name 
|`first_time_seen_child_process_of_zoom_filter`

Associated Analytic Story

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 should run the baseline search Previously Seen Zoom Child Processes - Initial to build the initial table of child processes and hostnames for this search to work. You should also schedule at the same interval as this search the second baseline search Previously Seen Zoom Child Processes - Update to keep this table up to date and to age out old child processes. Please update the previously_seen_zoom_child_processes_window macro to adjust the time window.

Required field

  • _time
  • Processes.parent_process_name
  • Processes.parent_process_id
  • Processes.process_name
  • Processes.process
  • Processes.parent_process_name
  • Processes.process_id
  • Processes.dest

Kill Chain Phase

  • Actions on Objectives

Known False Positives

A new child process of zoom isn't malicious by that fact alone. Further investigation of the actions of the child process is needed to verify any malicious behavior is taken.

RBA

Risk Score Impact Confidence Message
64.0 80 80 Child process $process_name$ with $process_id$ spawned by zoom.exe or zoom.us which has not been previously on host $dest$

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

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