IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
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-*
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
Rule queryedit
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)
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 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