The SIEM app is now a part of the Elastic Security solution.
Click
here to view the current documentation.
IMPORTANT: No additional bug fixes or documentation updates will be released for this version.
IMPORTANT: No additional bug fixes or documentation updates will be released for this version.
Network Connection via Regsvredit
Identifies the native Windows tools regsvr32.exe and regsvr64.exe making a
network connection. This may be indicative of an attacker bypassing allowlists
or running arbitrary scripts via a signed Microsoft binary.
Rule type: query
Rule indices:
- winlogbeat-*
Severity: low
Risk score: 21
Runs every: 5 minutes
Searches indices from: now-6m (Date Math format, see also Additional look-back time)
Maximum signals per execution: 100
Tags:
- Elastic
- Windows
Version: 2 (version history)
Added (Elastic Stack release): 7.6.0
Last modified (Elastic Stack release): 7.7.0
Potential false positivesedit
Security testing may produce events like this. Activity of this kind performed by non-engineers and ordinary users is unusual.
Rule queryedit
process.name:(regsvr32.exe or regsvr64.exe) and event.action:"Network connection detected (rule: NetworkConnect)" and not destination.ip:(10.0.0.0/8 or 169.254.169.254 or 172.16.0.0/12 or 192.168.0.0/16)
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
-
Technique:
- Name: Regsvr32
- ID: T1117
- Reference URL: https://attack.mitre.org/techniques/T1117/
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Regsvr32
- ID: T1117
- Reference URL: https://attack.mitre.org/techniques/T1117/
Rule version historyedit
- Version 2 (7.7.0 release)
-
Updated query, changed from:
(process.name:regsvr32.exe or process.name:regsvr64.exe) and event.action:"Network connection detected (rule: NetworkConnect)" and not destination.ip:169.254.169.254/32 and not destination.ip:10.0.0.0/8 and not destination.ip:172.16.0.0/12 and not destination.ip:192.168.0.0/16