Posts Tagged ‘Distinct Types’

Malware And Antivirus Software

Tuesday, July 28th, 2009

Malware And Antivirus Software

Joel Walsh

Warning: most antivirus programs will not protect you against all forms of malignant software (often called “malware”) on their own. Find out how to protect yourself.

Sure, your antivirus software will protect you against viruses. It will probably even do a good job against worms. But what Trojans, exploits, backdoors, spyware and the dozen other nasty software parasites?

Malware and Antivirus Software: a History

The war on computer viruses has led to an arms race between the designers of antivirus software and the designers of viruses (you didn’t think viruses just created themselves did you?). Some years ago, virus designers responded to ever more successful antivirus software by creating the descendents of viruses, worms, which did not infect files but rather installed themselves directly on the hard drive, making them harder to detect.

The arms race has since led to a total of at least eleven distinct types of what is now called malware, a neologism meaning bad (as in malignant rather than shoddy) software. According to Wikipedia, these eleven types of malware are:

1. Virus

2. Worm

3. Wabbit

4. Trojan

5. Backdoor

6. Spyware

7. Exploit

8. Rootkit

9. Key Logger

10. Dialer

11. URL injection

There’s a twelfth kind of malware: adware, which Wikipedia considers simply to be a subset of spyware.

Why Antivirus Software Isn’t Enough for Malware

As you can see, makers of antivirus software have their work cut out for them if they’re going to keep every instance of malware off your system. As a result, antivirus software makers have often had to pick their battles. Adware, whose makers often claim they are doing nothing illegal or even questionable, often gets treated more lightly.

Even when antivirus software makers do come out with a product that fights all twelve or so kinds of malware, responding to each new instance of malware to come on the market isn’t easy. First the malware has to be identified, which means someone’s computer, and probably tens of thousands of computers, will be infected first. Then, the malware has to be dissected. Then a removal program and a filter must both be written. Then the removal program and filter must be tested to make sure they work, and that they don’t interfere with any other functions of the antivirus software or the computer itself. When a fix for the virus is out, it then has to be loaded into an antivirus software update and transmitted to every single computer worldwide that has the antivirus software installed.

The speed with which antivirus software makers are able to deliver updates for newly discovered malware would impress even Santa Claus. Yet there’s still a crucial window of one to a few days between when the new malware has reached a critical mass of thousands of computers, and when the update is released. If your antivirus software is not set to check for updates automatically every hour or so, that window opens even wider.

Practically speaking, then, you’re better off having more than one line of defense against malware. Even if two different anti-malware programs utilize the exact same database, there might be a crucial difference in the speed of getting updates. It makes sense to back up your antivirus software with anti-spyware software. When you consider that dedicated anti-spyware software developers make protection against the non-virus forms of malware their stock-in-trade, you can see why anti-spyware software is so essential. In fact, you should strongly consider having two anti-spyware programs running on your computer at all times, since the gap in updates between two anti-spyware programs can be even longer than for two antivirus programs.

After all, with a dozen kinds of malware out there, shouldn’t you at least have two pieces of software to fight them?

About the author:
Joel Walsh writes for http://www.spyware-refuge.com on how to remove spyware: spyware adware blocker
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Does The Media Spread Computer Viruses?

Wednesday, May 27th, 2009

Summary: Could the mass media hype about computer viruses actually make the problem worse?

If you believe what you hear in the media, there are an awful lot of viruses going around. No, I’m not talking about the make-you-sick kind of virus, though they get plenty of airtime, too. I’m talking about the kind of virus that enters via your internet connection rather than your nasal passages.

What the mainstream media often don’t tell you–at least, in most radio and television newscasts and in the crucial headlines and opening paragraphs of newspaper articles– is that many of these “viruses” are not viruses at all.

What Computer Viruses Really Are

The main reason the mainstream media always are in alarm over viruses is that they tend to call any malicious computer program a virus. In reality, there are at least eleven distinct types of malicious software, or malware, commonly affecting computers today. The most common of these are worms, Trojans, and spyware.

So, what’s the difference between computer viruses and the other types of malware? The difference is that computer viruses are just about the only ones that regularly shut down computers and cause other obvious damage. The most common of the other kinds of malware–worms, Trojans, and spyware–are usually only detectable with a special scan.

The Real Danger of Computer Viruses

If the other types of malware are so unobtrusive that they can only be detected with a special scan, then what’s to worry about? For starters, these programs are called malicious for a reason: they are designed to cause some kind of damage, if not to your computer, then to someone else’s.

Worms are most famously used to damage, destroy, or disrupt other computer networks than the one on which the host computer is located. For instance, worms have been used by website owners to shut down rival websites by sending overwhelming numbers of requests to the computer that hosts that website. Worms have also been used to send out viruses to other computers, often without infecting the host machine–after all, what would it benefit the worm to shut down its host computer?

Trojans, in turn, are often used to insert worms and other malware on your computer, even if the Trojan itself does no damage.

But even if you don’t care what happens to anyone else, you should still be concerned about one kind of malware: spyware, a kind of malware that, true to its name, collects data from your computer and sends it back to a remote host.

Most spyware is only interested in monitoring your internet usage so it can tell other programs, called adware, what advertising to popup on your computer. However, there are criminal spyware programs that steal financial data, or perform a thorough identity theft. Don’t think you have personal or financial data on your computer? Some spyware programs contain a keylogger, which is a program that copies whatever you type, usually in order to snatch passwords. Even if you keep no financial information on your computer, if you ever buy anything over the web, the keylogger would allow its owner to buy stuff using the same information you typed in to buy stuff yourself.

Why Blame the Media?

Given the danger of all these different types of malware, isn’t it a good thing that the mass media are becoming hysterical about it? And can’t they be forgiven the sloppy reporting of calling Trojans, worms, spyware, and other malware “viruses”?

No, no, no.

This is a classic case of bad reporting doing more damage than no reporting at all. In this case, the damage bad reporting has done is to promote a common myth that goes something like this: “The only malicious software is a virus. Viruses damage your computer. Therefore, if my computer is working OK, my computer has no malicious software. I only need to scan my computer for problems when there is a sign of problems.”

Thanks to this myth, many people complacently let their antivirus software go months out of date, not wanting to be bothered with scheduling an automatic update. Just as bad, many people don’t have any extra software to combat the other types of malware that may not be covered by antivirus software.

In fact, it’s not uncommon for people who have found malware on their computers after a scan to say, “but I never had malware on my computer before!” But how would they have known if they had never scanned!

Until the biggest mainstream media–and especially television–start educating the public about the need to have their computers automatically scanned at least daily, the world will continue to have major, drawn-out problems with malware that could have been wiped out as soon as soon as the anti-malware software makers discovered it.

And until that day, the mainstream media will have many more opportunities to run hysterical stories about “viruses,” thereby forcing them to sell more newspapers and broadcast to even larger audiences of people who suck at the information trough yet somehow never become full.

About the author:Joel Walsh writes on all types of malware for spyware-refuge.com: http://www.spyware-refuge.com?
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