This is a bit of a nuisance because this examination takes
some time with a large amount of data, but it is useful. Because there is a
race between the manufacturers of anti-virus software (AV software) and the
spreaders of viruses. The disseminators are trying to get new viruses onto the
PCs faster than the AV manufacturers can detect them. And they succeed again
and again. In this way, a virus can become active on your computer despite the
antivirus program. If the AV manufacturer has added the malware to its virus
database after a day or two, it can now be detected by the manual scanner
during a search run.
How often you should run the scanner on your PC depends on
where and how often you are on the Internet. A weekly scan is a good guide.
Online
virus scanner
EnlargeGet a second opinion: If your antivirus software
reports a suspected harmless file as a virus, you can get a second opinion at
www.virustotal.com. There the file is checked by around 70 scanners.
What it does: Current online virus scanners offer you the
option of uploading individual files to a server and having them checked for
harmfulness by a manual scanner. This is usually done with two or three clicks.
The files are usually scanned by several virus scanners. This will give you a
good idea of whether the file is dangerous or not. The online virus scanner is
ideal if you are not sure whether a file is really dangerous. Examples are
www.virustotal.com , https://virusscan.jotti.org and
https://metadefender.opswat.com , with Virustotal being the most comprehensive
service.
You should pay attention to this: If you use
www.virustotal.com with its around 70 scanners, you have to note that some of
them are very sensitive. They report a file as suspicious when it is not
clearly harmless. Usually it is the built-in - ›heuristic of a virus scanner
that classifies even the smallest code components as a threat. Accordingly, the
following applies to the evaluation of the results: If only a few scanners
report a virus, for example one to five scanners, this could also be a false
alarm.
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