I opened a link I probably shouldn't have on Facebook and ever since Avast! has been giving me the 'Suspicious item has been detected' dialog every thirty seconds or so.
URL: http://r1---sn-8pgbpohxqp5-ac5e.gvt1.com/crx/blobs/QgAAAC6..(more stuff but it's hidden)
Infection: Win32:Evo-gen [Susp]
Now, the URL seems telling. The domain gvt1.com is owned by Google, and a CRX is a Chrome extension, so I suspect it's trying to download a malicious Chrome extension onto my PC. And it would appear it attempts to download it every 30 seconds, but Avast! keeps blocking it. However, I have no idea what to do to stop it from doing this and indeed whether or not my PC is already pwned.
I've run a full MBAM scan and thus far found no hint of any malware in memory nor in the file system, but I'm still scared my PC's been pwned and I don't know whether I should shut it down or run rkill or what.
Thank you for your help.
edit: forgot to mention, I run Windows 7.
Edited by xereeto, 14 December 2015 - 04:04 PM.