sequence with maxspan=1h
[process where host.os.type == "windows" and 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 host.os.type == "windows" and event.type == "start" and process.parent.name : "rundll32.exe"
] by process.parent.entity_id
Install detection rules in Elastic Security
Detect Unusual Child Processes of RunDLL32 in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).