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how to block advanced pc shield in sonicwall

Posted on 2011-09-29
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Hi
I am using sonicwall nsa2400 in company, recently one of my user who accidentally hit the ok button when the faked antivirus software pop up when the user browsing a website, my sonicwall has antispyware and content filtering subscription but still not able to detect it, how come?  And how can i block such kind of faked antivirus software and spyware?

Thanks!
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Question by:KANEWONG
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khairil earned 2000 total points
ID: 36890295
Hi,

It is like chicken and egg thing. We have dual layer firewall (different brand) + antimalware installed, but still out of 10,000 there are 2 or 3 that feels they are more knowledgable than us so they decide to put additional av - which then found out to be fake.

How come?
The answer are:
1. Firewall and antimalware depends on signature, if they do not have it then they do not know it. Some have heuristic that be able to guess some of the files but still not all.
2. The install package have special way to pack the files, which makes antimalware/spyware useless because they cannot "see" what is the package.

You can blocked that file by file name or hash signature (if your firewall support that) but by experience, it is useless - the scammer always come out with new "version" that have different signature.

The best thing you can do it to have awareness programme to your users. If you have active directory and your user attach to it, you can use GPO to disallow user from running installer of that fakeware - you still can do this manually with more work. You also might want to impose some fine if user failed to comply with that - you better have published policy before doing that.

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