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Strange Pop-up

Hello,

I have a problem with my iMac(intel). Sometimes when I turn it on, when it goes to the dekstop after the boot, a strange pop-up appears and immediatly dissappears so I am not able to see what it is saying. The only thing I noticed is that in this pop-up there is a yellow triangle( like an error message). I know my question is silly but is my iMac infected by a virus or malware? I have Sophos Anti-Virus which says that everything is ok. Please can cou help me? My version of OS X is Lion 10.7.2. Thank you!

iMac, Mac OS X (10.7.2)

Posted on Nov 6, 2011 1:03 PM

21 replies

Paul_31

Level 6

14,160 points

Dec 4, 2011 10:06 AM in response to konstantinos205

You don't need to worry - if you look in System Preferences>Security & Privacy, Firewall tab, Advanced button - you should see Java listed in there. Java's needed for some web functions (don't know what though 🙂 ).

Dec 11, 2011 8:54 AM in response to konstantinos205

I woudn't be so careless here. There has been a trojan floating around for about a year now that uses a Java applet to run itself without a user password. You should have Java turned off in Safari for security reasons unless you truly need it. Have you click on any suspicious links on a social networking site?

Dec 11, 2011 10:30 AM in response to millbear69

Well I clicked on one which was on facebook(my friend send me the link) and something was downloaded and when I opened it, it said ''This file can not be opened'' and if my memory serves me correctly safari not only downloaded the file but it also opened a website and it was saying that it isn't safe to go to this website so I closed it( unfortunately I saw it after I had downloaded and opened the file). Now I am scared from what you said. What should I do? Should I uninstall java or something like that? But for your understanding when I installed Sophos Antivirus and fully scanned my computer it found 1 infection but it said that it cleaned it and now that I still scan my iMac it says that it is cleaned.

Dec 11, 2011 12:02 PM in response to konstantinos205

First of all did you press 'accept'. If you didn't you should be fine. If you did, unfortunately you were infected with the Koobface trojan which doesn't require a user password. I FULLY SUGGEST YOU DON'T USE SOPHOS AS IT IS A VERY BUGGY AND INACCURATE SOFTWARE. Use ClamXav. That should search for the infected file.

Dec 13, 2011 5:14 AM in response to millbear69

I deleted sophos and installed ClamXav but it found nothing. Probably there is no trojan but I am not sure. Any other ideas of what I can do?

Paul_31

Level 6

14,160 points

Dec 13, 2011 5:20 AM in response to konstantinos205

I think you can stop worrying. If your Mac is behaving properly and Sophos and ClamXav have found nothing to report, I suspect there is nothing to report.

Strange Pop-up