Detection: Windows Application Layer Protocol RMS Radmin Tool Namedpipe

Updated Date: 2024-05-18 ID: b62a6040-49f4-47c8-b3f6-fc1adb952a33 Author: Teoderick Contreras, Splunk Type: TTP Product: Splunk Enterprise Security

Description

The following analytic detects the use of default or publicly known named pipes associated with the RMX remote admin tool. It leverages Sysmon EventCodes 17 and 18 to identify named pipe creation and connection events. This activity is significant as the RMX tool has been abused by adversaries and malware like Azorult to collect data from targeted hosts. If confirmed malicious, this could indicate unauthorized remote administration capabilities, leading to data exfiltration or further compromise of the affected system. Immediate investigation is required to determine the legitimacy of this tool's presence.

Search

1`sysmon` EventCode IN (17, 18) EventType IN ( "CreatePipe", "ConnectPipe") PipeName IN ("\\RManFUSServerNotify32", "\\RManFUSCallbackNotify32", "\\RMSPrint*") 
2| stats  min(_time) as firstTime max(_time) as lastTime count by Image EventType ProcessId PipeName dest UserID 
3| rename UserID as user 
4| `security_content_ctime(firstTime)` 
5| `security_content_ctime(lastTime)` 
6| `windows_application_layer_protocol_rms_radmin_tool_namedpipe_filter`

Data Source

Name	Platform	Sourcetype	Source	Supported App
Sysmon EventID 17	Windows	`'xmlwineventlog'`	`'XmlWinEventLog:Microsoft-Windows-Sysmon/Operational'`	N/A

Macros Used

Name	Value
security_content_ctime	`convert timeformat="%Y-%m-%dT%H:%M:%S" ctime($field$)`
windows_application_layer_protocol_rms_radmin_tool_namedpipe_filter	`search *`

windows_application_layer_protocol_rms_radmin_tool_namedpipe_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
T1071	Application Layer Protocol	Command And Control

KillChainPhase.COMMAND_AND_CONTROL

NistCategory.DE_CM

Cis18Value.CIS_10

Magic Hound

Rocke

TeamTNT

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 Notable	Yes
Rule Title	`%name%`
Rule Description	`%description%`
Notable Event Fields	user, dest
Creates Risk Event	True

This configuration file applies to all detections of type TTP. These detections will use Risk Based Alerting and generate Notable Events.

Implementation

To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.

Known False Positives

False positives may be present. Filter based on pipe name or process.

Associated Analytic Story

Azorult

Risk Based Analytics (RBA)

Risk Message	Risk Score	Impact	Confidence
possible RMS admin tool named pipe was created in endpoint $dest$	81	90	90

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	`XmlWinEventLog:Microsoft-Windows-Sysmon/Operational`	`xmlwineventlog`
Integration	✅ Passing	Dataset	`XmlWinEventLog:Microsoft-Windows-Sysmon/Operational`	`xmlwineventlog`

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