Detection: Windows Service Create SliverC2

Description

The following analytic detects the creation of a Windows service named "Sliver" with the description "Sliver Implant," indicative of SliverC2 lateral movement using the PsExec module. It leverages Windows EventCode 7045 from the System Event log to identify this activity. This behavior is significant as it may indicate an adversary's attempt to establish persistence or execute commands remotely. If confirmed malicious, this activity could allow attackers to maintain control over the compromised system, execute arbitrary code, and further infiltrate the network.

 1`wineventlog_system` EventCode=7045 ServiceName="sliver"
 2  
 3| stats count min(_time) as firstTime max(_time) as lastTime
 4    BY Computer EventCode ImagePath
 5       ServiceName ServiceType
 6  
 7| rename Computer as dest
 8  
 9| `security_content_ctime(firstTime)`
10  
11| `security_content_ctime(lastTime)`
12  
13| `windows_service_create_sliverc2_filter`

Data Source

Name Platform Sourcetype Source
Windows Event Log System 7045 Windows icon Windows 'XmlWinEventLog' 'XmlWinEventLog:System'

Macros Used

Name Value
wineventlog_system eventtype="wineventlog_system" OR Channel="system" OR source="XmlWinEventLog:System" OR source="WinEventLog:System"
windows_service_create_sliverc2_filter search *
windows_service_create_sliverc2_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
T1569.002 Service Execution Execution
Installation
DE.CM
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 Finding (Notable) Yes
Rule Title %name%
Rule Description %description%
Notable Event Fields user, dest
Creates Intermediate Finding (Risk Event) No
TTP detections generate a Finding (Notable) and may generate Intermediate Findings (Risk Events) for associated entities.

Implementation

To implement this analytic, the Windows EventCode 7045 will need to be logged from the System Event log. The Windows TA for Splunk is also recommended.

Known False Positives

False positives should be limited, but if another service out there is named Sliver, filtering may be needed.

Associated Analytic Story

Finding

Title Entity Field Entity Type Risk Score
A user mode service was created on $dest$ related to SliverC2. dest system 50

References

Detection Testing

Test Type Status Dataset Source Sourcetype
Validation Passing N/A N/A N/A
Unit Passing Dataset XmlWinEventLog:System XmlWinEventLog
Integration ✅ Passing Dataset XmlWinEventLog:System 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: 12