Monday, August 31, 2009

Computer Virus How you get infected?

In each case, viruses/worms/trojans can all be spread in the guise of literally ANYTHING people find desirable, such as a free game, movie, song, etc. Victims typically downloaded the file from a website, via file sharing programs such as KaZaa, over instant messaging (such as MSN), or by just carelessly opening some email attachment without thinking. Although these programs can also be exchanged on floppy disks, today the Internet has taken precedent as the distribution medium of choice.

• Viruses, worms and trojans often masquerade under files with various extensions, the most common of which are .exe (executable program – beware!), .com, .vbs, .pif, and .js. Be very suspicious if files with the following extensions arrive in your email without you expecting them, as they could contain a virus, worm or trojan.

• Macro viruses may arrive in the form of Microsoft Word (.doc), Microsoft Excel (.xls), and Microsoft Powerpoint (.ppt) files. Also, be wary of .htm and .html files; because they can access the Internet, they may direct you to a website that will forcibly attempt your machine to download unsafe files or exploit an un-patched security hole in Windows or Internet Explorer.

• In the case of worms, it is also possible to get one that activates just by reading an email, even when there is no attachment. A recent worm spread by taking advantage of a security hole in Microsoft Outlook Express that allowed it to run, even though there was no attachment in the email.

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