Windows Impair Defense Override SmartScreen Prompt
Description
The following analytic identifies a modification in the Windows registry to override windows defender smartscreen prompt. The "PreventSmartScreenPromptOverride" registry setting is associated with the Windows SmartScreen feature, specifically related to controlling whether users can override SmartScreen prompts. When attackers modify "PreventSmartScreenPromptOverride" to 0, it signifies an attempt to disable the prevention of user overrides for SmartScreen prompts. By doing so, attackers aim to allow users to bypass or ignore SmartScreen warnings or prompts. This change increases the risk by permitting users to disregard warnings about potentially unsafe or malicious files or websites that would typically trigger SmartScreen alerts. It could lead to users unintentionally executing or accessing malicious content, potentially resulting in security incidents or system compromises.
- Type: TTP
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2024-01-08
- Author: Teoderick Contreras, Splunk
- ID: 08058866-7987-486f-b042-275715ef6e9d
Annotations
ATT&CK
Kill Chain Phase
- Exploitation
NIST
- DE.CM
CIS20
- CIS 10
CVE
Search
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| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Registry WHERE Registry.registry_path= "*\\Microsoft\\Edge\\PreventSmartScreenPromptOverride" Registry.registry_value_data= "0x00000000" BY _time span=1h Registry.dest Registry.user Registry.registry_path Registry.registry_key_name Registry.registry_value_name Registry.registry_value_data Registry.process_guid
| `drop_dm_object_name(Registry)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `windows_impair_defense_override_smartscreen_prompt_filter`
Macros
The SPL above uses the following Macros:
windows_impair_defense_override_smartscreen_prompt_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Required fields
List of fields required to use this analytic.
- _time
- Registry.registry_key_name
- Registry.registry_value_name
- Registry.dest
- Registry.user
- Registry.registry_path
- Registry.action
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.
Known False Positives
It is unusual to turn this feature off a Windows system since it is a default security control, although it is not rare for some policies to disable it. Although no false positives have been identified, use the provided filter macro to tune the search.
Associated Analytic Story
RBA
Risk Score | Impact | Confidence | Message |
---|---|---|---|
49.0 | 70 | 70 | Windows Defender SmartScreen prompt was override on $dest$. |
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
Reference
- https://x.com/malmoeb/status/1742604217989415386?s=20
- https://github.com/undergroundwires/privacy.sexy
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
source | version: 1