It’s been quite a while since this thread saw some activity. So here goes: last January the CIRCL automatic launch object detection for Mac OS X, a free anti-malware utility was updated. The software is based on an idea by Topher Kessler, and monitors a number of Mac OS X locations known to have received malware files in past occasions. It’s up to the user to allow or disallow such installs, and provides an early warning for potential malware installation.