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

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

title	excerpt	categories	last_modified_at	toc	toc_label	tags
Allow Operation with Consent Admin	Abuse Elevation Control Mechanism	Endpoint	2021-06-10	true		Abuse Elevation Control Mechanism Privilege Escalation Defense Evasion Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

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Description

This analytic identifies a potential privilege escalation attempt to perform malicious task. This registry modification is designed to allow the Consent Admin to perform an operation that requires elevation without consent or credentials. We also found this in some attacker to gain privilege escalation to the compromise machine.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-06-10
• Author: Teoderick Contreras, Splunk
• ID: 7de17d7a-c9d8-11eb-a812-acde48001122

ATT&CK

ID	Technique	Tactic
T1548	Abuse Elevation Control Mechanism	Privilege Escalation, Defense Evasion

Search

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Registry where Registry.registry_path= "*\\Microsoft\\Windows\\CurrentVersion\\Policies\\System*" Registry.registry_value_name = ConsentPromptBehaviorAdmin Registry.registry_value_data = "0x00000000" by Registry.registry_path Registry.registry_key_name Registry.registry_value_data Registry.dest 
| `drop_dm_object_name(Registry)` 
| `security_content_ctime(firstTime)` 
|`security_content_ctime(lastTime)` 
| `allow_operation_with_consent_admin_filter`

Associated Analytic Story

• Ransomware

How To Implement

To successfully implement this search, you must be ingesting data that records registry activity from your hosts to populate the endpoint data model in the registry node. This is typically populated via endpoint detection-and-response product, such as Carbon Black or endpoint data sources, such as Sysmon. The data used for this search is typically generated via logs that report reads and writes to the registry.

Required field

• _time
• Registry.registry_path
• Registry.registry_key_name
• Registry.registry_value_name
• Registry.dest

Kill Chain Phase

• Exploitation

Known False Positives

unknown

RBA

Risk Score	Impact	Confidence	Message
25.0	50	50	Suspicious registry modification was performed on endpoint dest by user user. This behavior is indicative of privilege escalation.

Reference

• https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-gpsb/341747f5-6b5d-4d30-85fc-fa1cc04038d4
• https://www.trendmicro.com/vinfo/no/threat-encyclopedia/malware/Ransom.Win32.MRDEC.MRA/

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/malware/ransomware_ttp/data1/windows-sysmon.log

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