mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
P4T12ICK
65 lines
2.5 KiB
YAML
65 lines
2.5 KiB
YAML
name: Windows Registry Delete Task SD
|
|
id: ffeb7893-ff06-446f-815b-33ca73224e92
|
|
version: 1
|
|
date: '2022-04-13'
|
|
author: Michael Haag, Splunk
|
|
status: production
|
|
type: TTP
|
|
description: The following analytic identifies a process attempting to delete a scheduled
|
|
task SD (Security Descriptor) from within the registry path of that task. This may
|
|
occur from a non-standard process running and may not come from reg.exe. This particular
|
|
behavior will remove the actual Task Name from the Task Scheduler GUI and from the
|
|
command-line query - schtasks.exe /query. In addition, in order to perform this
|
|
action, the user context will need to be SYSTEM.
|
|
data_source:
|
|
- Sysmon Event ID 13
|
|
search:
|
|
selection1:
|
|
Registry.user: SYSTEM
|
|
TargetObject: '*\\Schedule\\TaskCache\\Tree\\*'
|
|
Registry.registry_value_name: SD
|
|
Registry.action:
|
|
- modified
|
|
- Deleted
|
|
condition: selection1
|
|
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 `Registry` node. In addition,
|
|
confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
|
|
endpoint product.
|
|
known_false_positives: False positives should be limited as the activity is not common
|
|
to delete ONLY the SD from the registry. Filter as needed. Update the analytic Modified
|
|
or Deleted values based on product that is in the datamodel.
|
|
references:
|
|
- https://www.microsoft.com/security/blog/2022/04/12/tarrask-malware-uses-scheduled-tasks-for-defense-evasion/
|
|
- https://gist.github.com/MHaggis/5f7fd6745915166fc6da863d685e2728
|
|
- https://gist.github.com/MHaggis/b246e2fae6213e762a6e694cabaf0c17
|
|
tags:
|
|
analytic_story:
|
|
- Windows Registry Abuse
|
|
- Windows Persistence Techniques
|
|
asset_type: Endpoint
|
|
confidence: 70
|
|
impact: 70
|
|
message: A scheduled task security descriptor was deleted from the registry on $dest$.
|
|
mitre_attack_id:
|
|
- T1053.005
|
|
- T1562
|
|
observable:
|
|
- name: dest
|
|
type: Endpoint
|
|
role:
|
|
- Victim
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
risk_score: 49
|
|
security_domain: endpoint
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1053.005/taskschedule/sd_delete_windows-sysmon.log
|
|
source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
|
|
sourcetype: xmlwineventlog
|