SLUI RunAs Elevated
Description
The following analytic identifies the Microsoft Software Licensing User Interface Tool, slui.exe
, elevating access using the -verb runas
function. This particular bypass utilizes a registry key/value. Identified by two sources, the registry keys are HKCU\Software\Classes\exefile\shell
and HKCU\Software\Classes\launcher.Systemsettings\Shell\open\command
. To simulate this behavior, multiple POC are available. The analytic identifies the use of runas
by slui.exe
.
- Type: TTP
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2021-05-13
- Author: Michael Haag, Splunk
- ID: 8d124810-b3e4-11eb-96c7-acde48001122
Annotations
ATT&CK
Kill Chain Phase
- Exploitation
NIST
CIS20
CVE
Search
1
2
3
4
5
6
| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name=slui.exe (Processes.process=*-verb* Processes.process=*runas*) by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `slui_runas_elevated_filter`
Macros
The SPL above uses the following Macros:
slui_runas_elevated_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Supported Add-on (TA)
List of Splunk Add-on’s tested to work with the analytic.
Required fields
List of fields required to use this analytic.
- _time
- Processes.dest
- Processes.user
- Processes.parent_process
- Processes.process_name
- Processes.process
- Processes.process_id
- Processes.parent_process_id
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 Processes
node.
Known False Positives
Limited false positives should be present as this is not commonly used by legitimate applications.
Associated Analytic Story
RBA
Risk Score | Impact | Confidence | Message |
---|---|---|---|
63.0 | 70 | 90 | A slui process $process_name$ with elevated commandline $process$ in host $dest$ |
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://www.exploit-db.com/exploits/46998
- https://mattharr0ey.medium.com/privilege-escalation-uac-bypass-in-changepk-c40b92818d1b
- https://gist.github.com/r00t-3xp10it/0c92cd554d3156fd74f6c25660ccc466
- https://www.rapid7.com/db/modules/exploit/windows/local/bypassuac_sluihijack/
- https://www.mandiant.com/resources/shining-a-light-on-darkside-ransomware-operations
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