Detection: Windows SIP Provider Inventory

Updated Date: 2024-05-09 ID: 21c5af91-1a4a-4511-8603-64fb41df3fad Author: Michael Haag, Splunk Type: Hunting Product: Splunk Enterprise Security

Description

The following analytic identifies all SIP (Subject Interface Package) providers on a Windows system using PowerShell scripted inputs. It detects SIP providers by capturing DLL paths from relevant events. This activity is significant because malicious SIP providers can be used to bypass trust controls, potentially allowing unauthorized code execution. If confirmed malicious, this activity could enable attackers to subvert system integrity, leading to unauthorized access or persistent threats within the environment. Analysts should review for new and non-standard paths to identify potential threats.

1`subjectinterfacepackage` Dll=*\\*.dll 
2| stats count min(_time) as firstTime max(_time) as lastTime values(Dll) by Path host
3| `security_content_ctime(firstTime)` 
4| `security_content_ctime(lastTime)`
5| `windows_sip_provider_inventory_filter`

Data Source

Name Platform Sourcetype Source Supported App
N/A N/A N/A N/A N/A

Macros Used

Name Value
security_content_ctime convert timeformat="%Y-%m-%dT%H:%M:%S" ctime($field$)
windows_sip_provider_inventory_filter search *
windows_sip_provider_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
T1553.003 SIP and Trust Provider Hijacking Defense Evasion
KillChainPhase.EXPLOITAITON
NistCategory.DE_AE
Cis18Value.CIS_10

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 implement this analytic, one must first perform inventory using a scripted inputs. Review the following Gist - https://gist.github.com/MHaggis/75dd5db546c143ea67703d0e86cdbbd1

Known False Positives

False positives are limited as this is a hunting query for inventory.

Associated Analytic Story

Risk Based Analytics (RBA)

Risk Message Risk Score Impact Confidence
A list of SIP providers on the system is available. Review for new and non-standard paths for SIP providers on $host$. 25 50 50
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

Detection Testing

Test Type Status Dataset Source Sourcetype
Validation ✅ Passing N/A N/A N/A
Unit ✅ Passing Dataset powershell://SubjectInterfacePackage PwSh:SubjectInterfacePackage
Integration ✅ Passing Dataset powershell://SubjectInterfacePackage PwSh:SubjectInterfacePackage

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: 2