splunk-security_content/docs/_posts/2020-02-07-macos_-_re-opened_applications.md

title, excerpt, categories, last_modified_at, toc, toc_label, tags

title	excerpt	categories	last_modified_at	toc	toc_label	tags
MacOS - Re-opened Applications		Endpoint	2020-02-07	true		Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

⚠️ WARNING THIS IS A EXPERIMENTAL DETECTION

We have not been able to test, simulate, or build datasets for this detection. Use at your own risk. This analytic is NOT supported.

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Description

This search looks for processes referencing the plist files that determine which applications are re-opened when a user reboots their machine.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2020-02-07
• Author: Jamie Windley, Splunk
• ID: 40bb64f9-f619-4e3d-8732-328d40377c4b

Search

| tstats `security_content_summariesonly` count values(Processes.process) as process values(Processes.parent_process) as parent_process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process="*com.apple.loginwindow*" by Processes.user Processes.process_name Processes.parent_process_name Processes.dest 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `macos___re_opened_applications_filter`

Associated Analytic Story

How To Implement

In order to properly run this search, Splunk needs to ingest process data from your osquery deployed agents with the splunk.conf pack enabled. Also the TA-OSquery must be deployed across your indexers and universal forwarders in order to have the data populate the Endpoint data model.

Required field

• _time
• Processes.process
• Processes.parent_process
• Processes.user
• Processes.process_name
• Processes.parent_process_name
• Processes.dest

Kill Chain Phase

• Installation
• Command and Control

Known False Positives

At this stage, there are no known false positives. During testing, no process events refering the com.apple.loginwindow.plist files were observed during normal operation of re-opening applications on reboot. Therefore, it can be asumed that any occurences of this in the process events would be worth investigating. In the event that the legitimate modification by the system of these files is in fact logged to the process log, then the process_name of that process can be added to an allow list.

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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