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 RunDLL32
editUnusual Network Connection via RunDLL32
editIdentifies unusual instances of rundll32.exe
making outbound network
connections. This may indicate adversarial activity and may identify malicious
DLLs.
Rule type: eql
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
- Host
- Windows
- Threat Detection
- Execution
Version: 6 (version history)
Added (Elastic Stack release): 7.6.0
Last modified (Elastic Stack release): 7.10.0
Rule authors: Elastic
Rule license: Elastic License
Rule query
editsequence by process.entity_id [process where process.name : "rundll32.exe" and event.type == "start"] [network where process.name : "rundll32.exe" and not cidrmatch(destination.ip, "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16", "127.0.0.0/8")]
Threat mapping
editFramework: 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 history
edit- Version 6 (7.10.0 release)
-
-
Updated query, changed from:
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)
-
- 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
-