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October 24, 2006 4:45 PM PDT

Zombies continue to chase Windows PCs

Malicious remote control software continues to be one of the biggest threats to Windows PCs, according to a new Microsoft security report.

More than 43,000 new variants of such insidious software were found in the first half of 2006, making them the most active category of malicious software, Microsoft said in a Security Intelligence Report published Monday. In June Microsoft also flagged zombies as the most prevalent threat to Windows PCs.

"Attackers, with financial gain in mind, are clearly concentrating a significant amount of development focus on this category of malware," Microsoft said in the report.

Of 4 million Windows PCs found to be infected with some kind of malicious software in the first half of this year, about 2 million were running malicious remote control software, Microsoft said. The data is collected by Microsoft's free Windows Malicious Software Removal Tool, which runs when security updates are installed on Windows PCs.

While the number is high, it is actually a decrease from the second half of 2005, when Microsoft found that 68 percent of infected PCs contained a backdoor Trojan. Meanwhile, hackers are trying harder to make their networks of hijacked computers go unnoticed by moving to new Web-based techniques.

A computer compromised by such a Trojan horse, popularly referred to as a zombie PC, can be used by miscreants in a network of bots, or "botnet," to relay spam and launch cyberattacks. Additionally, hackers often steal the victim's data and install spyware and adware on PCs, to earn a kickback from the spyware or adware maker.

Rootkits, which make system changes to hide another piece of possibly malicious software, remain an uncommon threat. There has been a 50 percent reduction in this kind of attack against computers running Windows during the past six months, Microsoft said.

Microsoft introduced the Windows Malicious Software Removal Tool in January last year. An updated version of the program ships monthly with Microsoft's security updates. The tool aims to identify and remove prevalent malicious software from PCs.

See more CNET content tagged:
Windows PC, malicious software, zombie, threat, trojan horse

Add a Comment (Log in or register) 31 comments (Showing first 20 comments)
Huge national security threat
by W2Kuser October 24, 2006 5:46 PM PDT
It's amazing that Microsoft is allowed to block criticial security updates to "unauthorized" PCs. This represents the single greatest threat to our national security.

And the problem is much worse than reported, because Microsoft's stats only count "authorized" PCs being updated. There are literally millions of PCs out there which are not fully patched, and comprise a hidden army an order of magnitude larger than Microsoft is reporting...
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Easy Solution: Send Out Old Fashion KILL VIRUSES.
by kamwmail-cnet1 October 24, 2006 7:30 PM PDT
These dumb arse zombies will install the kill viruses like they install all other viruses. Only the kill viruses will kill their machines. Taking it out of the Internet Genome.

Now if only we can kill the idiots themselves. Preferrably before they spawned and infest the HUMAN Genome further.
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5 years and not 1 virus or spyware using a Mac :)
by lenn5 October 24, 2006 7:56 PM PDT
Can't understand why anyone would want to use an OS that is so
vunerable to viruses, maleware and spyware???????
Reply to this comment
Easy solution, switch to a different OS..!!
by imacpwr October 25, 2006 12:56 AM PDT
Linux, Unix, Mac..
If you want (more) security from your OS then switch, doesn't
matter which one as long as it's not Microsoft Windows.
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Don't worry, Vista will fix the problem.
by rcrusoe October 25, 2006 3:09 AM PDT
After all, it was built from the "ground up" to be more secure.

Just because Vista has been included in many of the recent critical
updates for XP doesn't mean that it shares many of XP's security
problems, does it?

Oh. Nevermind.
Reply to this comment View all 2 replies
Is this why there is ALWAYS a fresh supply of hacked passwords?
by baswwe October 25, 2006 6:18 AM PDT
The passwords sites have new passwords daily to all the good sites. It is unbelievable!
Reply to this comment
Easiest Solution
by thedreaming October 25, 2006 8:23 AM PDT
The problem with worms, viruses and spyware is that their delivery system is a tool that most people can't do without: The Internet. Remove that and all those threats will have no easy and direct way to reach you.
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How Much Spam Comes From..
by jltnol October 25, 2006 9:33 AM PDT
With up to 80% of all e-mail spam, I'm wondering how much is
being sent out by zombie computers.. and how much is being sent
out by legit spammers? <legit spammers.. that's funny>
Reply to this comment
Why wouldn't they?
by gernblan October 26, 2006 5:40 PM PDT
Since Microsoft plans to not let people get updates that upgrade their computer or due to MS's own bugs, fail WGA. Of course that means more security holes to exploit--more opportunity to turn machines into zombies.

Open source software doesn't have this problem. I wonder why? Could it be because the code is open and thus gets fixed?

Security through obscurity doesn't work. The numbers don't lie.

And thanks to Vista, it's only going to get worse, as even antivirus companies are locked out from doing anything about it.
Reply to this comment
If they can be zombied
by wbenton October 28, 2006 8:42 PM PDT
If they can be zombied, that means that they are hackable.

As such, we should use the skills of already caught and imprisoned hackers to hack into and take down those zombied PC's as a way to possibly reduce their sentences.

Offer them a 60 second reduction of their sentence for every zombied PC they took down. If they took down the entire 2 Million army of zombies they could reduce their sentence by 3.8 years.

Problem resolved quickly.

Walt
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