Hackers
could penetrate a firewall and drop a virus in your computer. Therefore
scanning your computer regular would help to detect known viruses. By the way,
hackers could rename a virus, thus antivirus software may fail to detect it.
Usually antivirus software scans a virus based on its name.
Another
common problem was installing free software or cracked software over the
Internet. Hackers could embed their virus in that software. For example, a legitimate
filename was printer.dll. However, hackers could append or pack that file with
virus file, so that file was larger in size. During installation, the “hacked”
file printer.dll would be extracted to smaller legitimate printer.dll plus
virus to your computer.
Cracked
software means software was hacked and disables its license mechanism. This
could be done by a hacker.
Why
did we propose “no download” policy to several companies? Even an IT expert
cannot tell how many files and its real size in “legitimate or hacked” software.
There
are many viruses called worms. Those worms would spread from an infected computer
to other computers connected in a network.
The
best strategy to defend your computer would be “don’t download and install
software that you don’t know” AND don’t keep confidential files in your
computer. If you needed software, you should try to download it from its
service provider. For example, only downloading and installing free Adobe
Reader from Adobe web site instead of an unknown web site. Adobe Reader from
other web sites could be a hacked version.If you don’t have confidential files such as credit card numbers in your computer, hackers would not bother to break in your computer.
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