splunk-security_content/docs/_posts/2021-10-06-sdelete_application_execution.md

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

title	excerpt	categories	last_modified_at	toc	toc_label	tags
Sdelete Application Execution	Data Destruction, File Deletion, Indicator Removal on Host	Endpoint	2021-10-06	true		TTP T1485 Data Destruction Impact T1070.004 File Deletion Defense Evasion T1070 Indicator Removal on Host Defense Evasion Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint Exploitation

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Description

This analytic is to detect the execution of sdelete.exe application sysinternal tools. This tool is one of the most use tool of malware and adversaries to remove or clear their tracks and artifact in the targetted host. This tool is designed to delete securely a file in file system that remove the forensic evidence on the machine. A good TTP query to check why user execute this application which is not a common practice.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-10-06
• Author: Teoderick Contreras, Splunk
• ID: 31702fc0-2682-11ec-85c3-acde48001122

ATT&CK

ID	Technique	Tactic
T1485	Data Destruction	Impact
T1070.004	File Deletion	Defense Evasion
T1070	Indicator Removal on Host	Defense Evasion

Search

| tstats `security_content_summariesonly` values(Processes.process) as process values(Processes.parent_process) as parent_process values(Processes.process_id) as process_id count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where `process_sdelete` by  Processes.process_name Processes.original_file_name Processes.dest Processes.user Processes.parent_process_name Processes.parent_process 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `sdelete_application_execution_filter`

Associated Analytic Story

• Masquerading - Rename System Utilities

How To Implement

To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the Endpoint datamodel in the Processes node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.

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

Kill Chain Phase

• Exploitation

Known False Positives

user may execute and use this application

RBA

Risk Score	Impact	Confidence	Message
49.0	70	70	sdelete process process_name executed in dest

Reference

• https://app.any.run/tasks/956f50be-2c13-465a-ac00-6224c14c5f89/

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

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1485/sdelete/sysmon.log

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