Google has recently launched a Site Status Section. This tool provides information as to the reasons by which a certain URL was flagged by Google's Safe Browsing systems as a site that hosts or encourages the download of unwanted software, thereby blocking users from navigating to such site (through Chrome's "Red Warning"). Google declared that the Site Status would return to normal once the site has been cleaned up.
This development would allow better transparency with respect to the reasons for the detection of a URL as an unsafe site by Google.