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Different Number of "Known Viruses"
Matthew


Joined: 14 Nov 2006
Posts: 7
Location: Germany
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Hallo!

I am using ClamWin 0.92. When looking at Help > About, there is the number of 218.395 "Known viruses". When I do a Memory Scan, then Logfile says, ClamWin has 215.099 Known viruses.

Which number of viruses is right?

Greetings from

Matthew
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GuitarBob


Joined: 09 Jul 2006
Posts: 4376
Location: USA
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I think the "official' number of signatures is on the ClamAV main page at http://www.clamav.net/ on the Web. That for the moment is the 218,000. They are adding signatures like mad lately--as are most of the antivirus companies. In fact, for antivirus software with fancy heuristics, the detection rate for malware caught by signatures seems to be getting closer to the rate for their heuristics.

Regards,
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SixDrez


Joined: 08 Feb 2008
Posts: 5
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I've noticed the same phenomenon.
The number of known viruses in the about window (which is the 'real' total number of signatures you can see on the ClamAV webpage) differs from the number of known viruses that is displayed in the report window after a virus scan.

At this moment:

Protecting from (About-window): 232353 viruses
Known viruses (Report-window): 228880

A difference of 3473

Should be fixed!
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SixDrez


Joined: 08 Feb 2008
Posts: 5
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No responses?
What is the reason for that difference?
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b0ne


Joined: 26 Oct 2006
Posts: 174
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SixDrez wrote:
No responses?
What is the reason for that difference?


Potentially unwanted applications, add
--detect-pua
to your clamwin additional clamscan parameters.
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GuitarBob


Joined: 09 Jul 2006
Posts: 4376
Location: USA
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Also...Clam detects much more than 128,000 or so signatures--due to generic signatures. That's why the number of signatures is a bit misleading. In a recent test (see http://www.virusbtn.com/news/2008/03_13a.xml) Clam found about 85% of 1,130,556 separate malwares. Most of the commercial AVs found in the 90% range, but to me, 85% is still pretty good!

Regards,
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Matthew


Joined: 14 Nov 2006
Posts: 7
Location: Germany
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Maybe it`s interesting:

The difference in the number of the viruses is varying:

- 3488
- 3492
- 3438
- 3465
- 3466
- 3460
- 3517
- 3522
- 3524

Greetings from
Matthew
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b0ne


Joined: 26 Oct 2006
Posts: 174
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Did you enable PUA in the ClamWin options?
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Matthew


Joined: 14 Nov 2006
Posts: 7
Location: Germany
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What ist PUA?
Do I find it somewhere in "preferences"?

Greetings from
Matthew
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budtse


Joined: 14 Jan 2006
Posts: 372
Location: Belgium
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PUA = Potentially Unwanted Applications

You can find it in the Advanced tab of Preferences.
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Matthew


Joined: 14 Nov 2006
Posts: 7
Location: Germany
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Hallo!


Thank you for your tipp! I have used the Memory Scan twice.

With disabled PNU: Difference: 3525 viruses

With enabled PNU: Difference: 2905 viruses


Couldn`t anyone of you verify the same "mistake"?

Greetings from
Matthew
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GuitarBob


Joined: 09 Jul 2006
Posts: 4376
Location: USA
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I guess we could have done so. To me, however, it's not really that important--they are always doing some "housekeeping." In addition, the number of signatues isn't really a good indication any more of the number of viruses/malware that can be detected due to generic/family signatures. Clam recently caught nearly 78% of over a million viruses in a recent test. See http://www.sunbelt-software.com/ihs/alex/Results_2D2008m3b_US.xls_detection2.htm on the Web.

Regards,
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Different Number of "Known Viruses"
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