Detection: Windows Driver Inventory

EXPERIMENTAL DETECTION

This detection status is set to experimental. The Splunk Threat Research team has not yet fully tested, simulated, or built comprehensive datasets for this detection. As such, this analytic is not officially supported. If you have any questions or concerns, please reach out to us at research@splunk.com.

Updated Date: 2024-10-17 ID: f87aa96b-369b-4a3e-9021-1bbacbfcb8fb Author: Michael Haag, Splunk Type: Hunting Product: Splunk Enterprise Security

Description

The following analytic identifies drivers being loaded across the fleet. It leverages a PowerShell script input deployed to critical systems to capture driver data. This detection is significant as it helps monitor for unauthorized or malicious drivers that could compromise system integrity. If confirmed malicious, such drivers could allow attackers to execute arbitrary code, escalate privileges, or maintain persistence within the environment.

Search

1`driverinventory` 
2| stats values(Path) min(_time) as firstTime max(_time) as lastTime count by host DriverType 
3| rename host as dest 
4| `security_content_ctime(firstTime)` 
5| `security_content_ctime(lastTime)` 
6| `windows_driver_inventory_filter`

Data Source

No data sources specified for this detection.

Macros Used

Name	Value
driverinventory	`sourcetype=PwSh:DriverInventory`
windows_driver_inventory_filter	`search *`

windows_driver_inventory_filter is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Annotations

- MITRE ATT&CK

+ Kill Chain Phases

+ NIST

+ CIS

- Threat Actors

ID	Technique	Tactic
T1068	Exploitation for Privilege Escalation	Privilege Escalation

KillChainPhase.EXPLOITAITON

NistCategory.DE_AE

Cis18Value.CIS_10

APT28

APT29

APT32

APT33

BITTER

Cobalt Group

FIN6

FIN8

LAPSUS$

MoustachedBouncer

PLATINUM

Scattered Spider

Threat Group-3390

Tonto Team

Turla

Volt Typhoon

Whitefly

ZIRCONIUM

Default Configuration

This detection is configured by default in Splunk Enterprise Security to run with the following settings:

Setting	Value
Disabled	true
Cron Schedule	`0 * * * *`
Earliest Time	`-70m@m`
Latest Time	`-10m@m`
Schedule Window	`auto`
Creates Risk Event	False

This configuration file applies to all detections of type hunting.

Implementation

To capture the drivers by host, utilize the referenced Gist to create the inputs, props and transforms. Otherwise, this hunt query will not work.

Known False Positives

Filter and modify the analytic as you'd like. Filter based on path. Remove the system32\drivers and look for non-standard paths.

Associated Analytic Story

Windows Drivers

Risk Based Analytics (RBA)

Risk Message	Risk Score	Impact	Confidence
Drivers have been identified on $dest$.	5	50	10

The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

References

https://gist.github.com/MHaggis/3e4dc85c69b3f7a4595a06c8a692f244

Detection Testing

Test Type	Status	Dataset	Source	Sourcetype
Validation	Not Applicable	N/A	N/A	N/A
Unit	✅ Passing	Dataset	`PwSh:DriverInventory`	`PwSh:DriverInventory`
Integration	✅ Passing	Dataset	`PwSh:DriverInventory`	`PwSh:DriverInventory`

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: GitHub | Version: 3