File Download Using ProtocolHandler.exe
This rule detects the use of "ProtocolHandler.exe" to download files from the internet. "ProtocolHandler.exe" is a legitimate Windows binary that can be abused to download files, often placing them in the Internet Explorer cache folder. The detection specifically looks for the execution of "ProtocolHandler.exe" combined with command-line arguments containing common internet protocols like 'ftp://', 'http://', or 'https://'. This behavior is indicative of System Binary Proxy Execution (T1218) where a trusted binary is used to perform malicious actions, potentially bypassing security controls.
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