ID | Technique | Tactic |
---|---|---|
T1543.003 | Windows Service | Persistence |
T1543 | Create or Modify System Process | Privilege Escalation |
Detection: Windows Service Create RemComSvc
Description
The following analytic detects the creation of the RemComSvc service on a Windows endpoint, typically indicating lateral movement using RemCom.exe. It leverages Windows EventCode 7045 from the System event log, specifically looking for the "RemCom Service" name. This activity is significant as it often signifies unauthorized lateral movement within the network, which is a common tactic used by attackers to spread malware or gain further access. If confirmed malicious, this could lead to unauthorized access to sensitive systems, data exfiltration, or further compromise of the network.
Search
1`wineventlog_system` EventCode=7045 ServiceName="RemCom Service"
2| stats count min(_time) as firstTime max(_time) as lastTime by dest ImagePath ServiceName ServiceType
3| `security_content_ctime(firstTime)`
4| `security_content_ctime(lastTime)`
5| `windows_service_create_remcomsvc_filter`
Data Source
Name | Platform | Sourcetype | Source | Supported App |
---|---|---|---|---|
Windows Event Log System 7045 | Windows | 'xmlwineventlog' |
'XmlWinEventLog:System' |
N/A |
Macros Used
Name | Value |
---|---|
security_content_ctime | convert timeformat="%Y-%m-%dT%H:%M:%S" ctime($field$) |
windows_service_create_remcomsvc_filter | search * |
windows_service_create_remcomsvc_filter
is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Annotations
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 | True |
Implementation
To implement this analytic, the Windows EventCode 7045 will need to be logged. The Windows TA for Splunk is also recommended.
Known False Positives
False positives may be present, filter as needed based on administrative activity.
Associated Analytic Story
Risk Based Analytics (RBA)
Risk Message | Risk Score | Impact | Confidence |
---|---|---|---|
A new service was created related to RemCom on $dest$. | 32 | 40 | 80 |
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: 2