The SIEM app is now a part of the Elastic Security solution.
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here to view SIEM documentation for previous releases.
Unusual Network Connection via RunDLL32edit
Identifies unusual instances of rundll32.exe making outbound network
connections. This may indicate adversarial activity and may identify malicious
DLLs.
Rule type: query
Rule indices:
- winlogbeat-*
- logs-endpoint.events.*
Severity: low
Risk score: 21
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
Tags:
- Elastic
- Windows
Version: 5 (version history)
Added (Elastic Stack release): 7.6.0
Last modified (Elastic Stack release): 7.9.1
Rule authors: Elastic
Rule license: Elastic License
Rule queryedit
event.category:network and event.type:connection and process.name:rundll32.exe and not destination.ip:(10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16 or 127.0.0.0/8)
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
-
Technique:
- Name: Rundll32
- ID: T1085
- Reference URL: https://attack.mitre.org/techniques/T1085/
Rule version historyedit
- Version 5 (7.9.1 release)
-
- Formatting only
- Version 4 (7.9.0 release)
-
-
Updated query, changed from:
process.name:rundll32.exe and event.action:"Network connection detected (rule: NetworkConnect)" and not destination.ip:(10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16 or 127.0.0.0/8)
-
- Version 3 (7.8.0 release)
-
-
Updated query, changed from:
process.name:rundll32.exe and event.action:"Network connection detected (rule: NetworkConnect)" and not destination.ip:(10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16)
-
- Version 2 (7.7.0 release)
-
-
Updated query, changed from:
process.name:rundll32.exe and event.action:"Network connection detected (rule: NetworkConnect)" 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
-