Unusual Child Processes of RunDLL32edit
Identifies child processes of unusual instances of RunDLL32 where the command line parameters were suspicious. Misuse of RunDLL32 could indicate malicious activity.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
- winlogbeat-*
- logs-windows.*
Severity: high
Risk score: 73
Runs every: 30 minutes
Searches indices from: now-60m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Defense Evasion
Version: 101 (version history)
Added (Elastic Stack release): 7.10.0
Last modified (Elastic Stack release): 8.5.0
Rule authors: Elastic
Rule license: Elastic License v2
Rule queryedit
sequence with maxspan=1h [process where event.type == "start" and (process.name : "rundll32.exe" or process.pe.original_file_name == "RUNDLL32.EXE") and process.args_count == 1 ] by process.entity_id [process where event.type == "start" and process.parent.name : "rundll32.exe" ] by process.parent.entity_id
Threat mappingedit
Framework: MITRE ATT&CKTM
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Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
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Technique:
- Name: System Binary Proxy Execution
- ID: T1218
- Reference URL: https://attack.mitre.org/techniques/T1218/
Rule version historyedit
- Version 101 (8.5.0 release)
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Updated query, changed from:
sequence with maxspan=1h [process where event.type in ("start", "process_started") and (process.name : "rundll32.exe" or process.pe.original_file_name == "RUNDLL32.EXE") and process.args_count == 1 ] by process.entity_id [process where event.type in ("start", "process_started") and process.parent.name : "rundll32.exe" ] by process.parent.entity_id
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- Version 6 (8.4.0 release)
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- Formatting only
- Version 4 (7.14.0 release)
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- Formatting only
- Version 3 (7.12.0 release)
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- Formatting only
- Version 2 (7.11.0 release)
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-
Updated query, changed from:
sequence with maxspan=1h [process where event.type in ("start", "process_started") and /* uncomment once in winlogbeat */ (process.name : "rundll32.exe" /* or process.pe.original_file_name == "RUNDLL32.EXE" */ ) and process.args_count < 2 ] by process.entity_id [process where event.type in ("start", "process_started") and process.parent.name : "rundll32.exe" ] by process.parent.entity_id
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