IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Unusual Child Processes of RunDLL32
editUnusual Child Processes of RunDLL32
editIdentifies 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-*
Severity: high
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
- Defense Evasion
Version: 1
Added (Elastic Stack release): 7.10.0
Rule authors: Elastic
Rule license: Elastic License
Rule query
editsequence 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
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Rundll32
- ID: T1085
- Reference URL: https://attack.mitre.org/techniques/T1085/