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<blockquote data-quote="RoChess" data-source="post: 545092" data-attributes="member: 18896"><p>All the regular part of a virus scanner does is match so called 'virus fingerprints', which is a string of bytes that uniquely identifies a certain virus. New virusses come out every minute, which is why it is important to keep your anti-virus database updated often. That's why a lot of virus scanner offer Heurithic scanning ability, which allows them to detect unknown virusses by analysing their behaviour instead of just matching them up to a string.</p><p></p><p>And unfortunatly that string of bytes can be accidently created as well, this is called a false positive. The odds are low, but with the massive amount of random bytes on your computer from files downloaded (or created) and the huge amount of virus fingerprints, the odds are much better then say finding somebody on this planet that has the same fingerprints as you do.</p><p></p><p>Use <a href="http://www.virustotal.com" target="_blank">VirusTotal - Free Online Virus and Malware Scan</a> otherwise, which allows you to verify your suspected file on a multitude of virus scanners (41 at this moment).</p><p></p><p>AVast is known to have a lot of false positives, which is why I personally avoid it, so it could be that. But just use virustotal.com then, because if your system is indeed generating infected JPEGs, then all 41 scanners will show as such. If it's only a few, then you most likely are dealing with either a brand new virus (pay close attention to the result of Kaspersky, TrendMicro and the more respectable ones, as their response time to new virusses is less then 4 hours) or more then likely a false positive.</p><p></p><p>Virustotal.com generates a hash on the file you upload, so you can go back to their website later and verify the same hash. A new virus is quickly picked up by other scanners, and false positives are usually removed.</p></blockquote><p></p>
[QUOTE="RoChess, post: 545092, member: 18896"] All the regular part of a virus scanner does is match so called 'virus fingerprints', which is a string of bytes that uniquely identifies a certain virus. New virusses come out every minute, which is why it is important to keep your anti-virus database updated often. That's why a lot of virus scanner offer Heurithic scanning ability, which allows them to detect unknown virusses by analysing their behaviour instead of just matching them up to a string. And unfortunatly that string of bytes can be accidently created as well, this is called a false positive. The odds are low, but with the massive amount of random bytes on your computer from files downloaded (or created) and the huge amount of virus fingerprints, the odds are much better then say finding somebody on this planet that has the same fingerprints as you do. Use [url=http://www.virustotal.com]VirusTotal - Free Online Virus and Malware Scan[/url] otherwise, which allows you to verify your suspected file on a multitude of virus scanners (41 at this moment). AVast is known to have a lot of false positives, which is why I personally avoid it, so it could be that. But just use virustotal.com then, because if your system is indeed generating infected JPEGs, then all 41 scanners will show as such. If it's only a few, then you most likely are dealing with either a brand new virus (pay close attention to the result of Kaspersky, TrendMicro and the more respectable ones, as their response time to new virusses is less then 4 hours) or more then likely a false positive. Virustotal.com generates a hash on the file you upload, so you can go back to their website later and verify the same hash. A new virus is quickly picked up by other scanners, and false positives are usually removed. [/QUOTE]
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