RE: Ghostery a threat?
It looks legit from what I see, I also uploaded the file to VirusTotal although it looks like Comodo isn't detecting the initial file, but rather a part of it kind of. Here are the results to the scan anyways:
http://www.virustotal.com/file-scan/report.html?id=cd4639d45e174f61e8c93758f79bc430e757b1ca07ef5d0633b28024b17263d9-1309977251
You might consider reporting it for a false positive.