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Preventing infection by Antimalware Doctor


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#1 Michael Carter

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Posted 16 April 2011 - 07:33 AM

My computer has been repeatedly infected by something calling itself Antimalware Doctor, a nasty piece of malware which effectively renders the computer unusable until I have restored it to a pre-infection state using an Acronis boot CD and a backup stored on an external drive. The fix is not hard, but it is time consuming.

The computer gets infected when we watch a TV show on this web site:

hxxp://wowpinoytv.blogspot.com/2011/04/mara-clara-april-15-2011.html

I'm sure the conservative advice would be to avoid the web site, but it is a ripper of a show!

The computer runs WinXP pro SP3, and has AVG free installed, along with Spybot S&D. Spybot will find the infection once it is there, and if I kill the process associated with it (k70ccreloc.exe), it seems to remove it. But after a short pause it comes back and reaks havoc, corrupting files, killing the network and so on. AVG doesn't seem to notice anything is wrong.

I am curious as to how the malware is getting on to the computer. Nothing is happening, except at TV show is playing in a Browser (Firefox - current version). No ads are being clicked, the mouse is not rolling over anything. The show is playing, and suddenly the Antimalware Doctor window opens up.

I should also like to know of a not too expensive tool which will sound an alert as the computer is being infected, or better still prevent it from happening.

With many thanks

MCart :)

Edited by quietman7, 16 April 2011 - 08:35 AM.


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#2 quietman7

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Posted 16 April 2011 - 08:39 AM

Please do not post active links to malware or possible malware related sites to include links which may lead to sites where infections have been contracted and spread. I have disabled the one(s) you posted so others do not accidentally click on them.

I am curious as to how the malware is getting on to the computer.

Please read How Malware Spreads - How did I get infected which explains the most common ways malware is contracted and spread.


I should also like to know of a not too expensive tool which will sound an alert as the computer is being infected, or better still prevent it from happening.

No single product is 100% foolproof and can prevent, detect and remove all threats at any given time. Just because one anti-virus detected threats that another missed, does not mean its more effective. The security community is in a constant state of change as new infections appear. Security vendors use different scanning engines and different detection methods such as heuristic analysis or behavioral analysis which can account for discrepancies in scanning outcomes. Depending on how often the anti-virus database is updated can also account for differences in threat detections.

Further, each vendor has its own definition of what constitutes malware and scanning your computer using different criteria will yield different results. The fact that each program has its own definition files means that some malware may be picked up by one that could be missed by another. Thus, a multi-layered defense using several anti-spyware products (including an effective firewall) to supplement your anti-virus combined with common sense, safe computing and safe surfing habits provides the most complete protection.



Tips to protect yourself against malware and reduce the potential for re-infection:

Keep Windows and Internet Explorer current with all security updates from Microsoft which will patch many of the security holes through which attackers can gain access to your computer. When necessary, Microsoft releases security updates on the second Tuesday of each month and publishes Security update bulletins to announce and describe the update. If you're not sure how to install updates, please refer to Updating your computer. Microsoft also recommends Internet 6 and 7 users to upgrade their browsers due to security vulnerabilities which can be exploited by hackers.

Avoid gaming sites, porn sites, pirated software (warez), cracking tools, and keygens. They are a security risk which can make your computer susceptible to a smörgåsbord of malware infections, remote attacks, exposure of personal information, and identity theft. In some instances an infection may cause so much damage to your system that recovery is not possible and the only option is to wipe your drive, reformat and reinstall the OS.

Avoid peer-to-peer (P2P) file sharing programs (i.e. Limewire, eMule, Kontiki, BitTorrent, BitComet, uTorrent, BitLord, BearShare). They too are a security risk which can make your computer susceptible to malware infections. File sharing networks are thoroughly infected and infested with malware according to Senior Virus Analyst, Norman ASA. Malicious worms, backdoor Trojans IRCBots, and rootkits spread across P2P file sharing networks, gaming, porn and underground sites. Users visiting such pages may see innocuous-looking banner ads containing code which can trigger pop-up ads and malicious Flash ads that install viruses, Trojans, and spyware. Ads are a target for hackers because they offer a stealthy way to distribute malware to a wide range of Internet users. The best way to reduce the risk of infection is to avoid these types of web sites and not use any P2P applications.
Beware of Rogue Security software as they are one of the most common sources of malware infection. They infect machines by using social engineering and scams to trick a user into spending money to buy a an application which claims to remove malware. For more specific information on how these types of rogue programs install themselves and spread infections, read How Malware Spreads - How did I get infected.

Keeping Autorun enabled on flash drives has become a significant security risk as they are one of the most common infection vectors for malware which can transfer the infection to your computer. One in every eight malware attacks occurs via a USB device. Many security experts recommend you disable Autorun as a method of prevention. Microsoft recommends doing the same.Note: If using Windows 7, be aware that in order to help prevent malware from spreading, the Windows 7 engineering team made important changes and improvements to AutoPlay so that it will no longer support the AutoRun functionality for non-optical removable media.

Always update vulnerable software like browsers, Adobe Reader and Java Runtime Environment (JRE) with the latest security patches. Older versions of these programs have vulnerabilities that malicious sites can use to exploit and infect your system.
Change all passwords: Anytime you encounter a malware infection on your computer, especially if that computer was used for online banking, has credit card information or other sensitive data on it, all passwords should be changed immediately to include those used for banking, email, eBay, paypal and any online activities which require a username and password. You should consider them to be compromised and change passwords as a precaution in case an attacker was able to steal your information when the computer was infected. If using a router, you need to reset it with a strong logon/password so the malware cannot gain control before connecting again.

• Finally, use common sense, safe computing and safe surfing habits provides the most complete protection.
Security Resources from Microsoft:Other Security Resources:Browser Security Resources:

Edited by quietman7, 16 April 2011 - 08:42 AM.

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#3 Michael Carter

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Posted 16 April 2011 - 02:47 PM

Thank you for your reply.

I guess I know I am breaking the "safe surfing rules" by visiting a site, which I know tries to post malware. I am not complaining about being infected, nor am I asking for advice on how to remove the infection. I was looking for a tool which would help me to identify the attack vector.

My computers are on a home network, which sits behind a router. They are all configured to install automatic updates, and the Windows Firewall is turned on. Browsers are IE8 or Firefox 3.6, and supporting software (Adobe etc) updates are accepted and installed. So the probability of a random attack from outside is quite low, and therefore in my understanding, any malicious software requires the user to do something - click a button or balloon.

In this case nothing is being clicked, except the play button to run the media.




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