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Am I still infected with Virut ?


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#1 xbu

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Posted 08 November 2009 - 08:07 AM

Hello,

I made a terrible mistake by cliking OK on a panel from a website.
As a consequence something got installed and I started getting AVG resident shield alerts about virut and heur infection.
Porn icons also appeared on my desktop.

I made a shutdown of the computer and reboot using a Norton Ghost 14 - Recovery Disk to replace my C drive with an image made prior to infection.

I ran a complete scan of my computer with AVG 9. It found one or two executables on my D drive infected by
"heur" that were moved to quarantine. Everything seemed going well, but when I tried to launch a game located on my D drive, AVG resident shield got crazy about virut infection attacking my system files and I had to use the same image again.

First question : Why AVG is not able to find the infected executables on my D drive ? Do I have to get ride of all my executables ?
How can I be sure that there is no remaining source of infection ?

Second question : I made a copy of my datas on DVDs using NERO (jpg, avi, documents but no executables). How can I be sure that these DVDs are safe ?

Thanks for your help,
Xavier

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#2 quietman7

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Posted 09 November 2009 - 11:47 AM

Virut is a polymorphic file infector with IRCBot functionality which infects .exe, .scr files, downloads more malicious files to your system, and opens a back door that compromises your computer.

With this particular infection, the safest solution and only sure way to remove it effectively is to reformat and reinstall the OS.

According to this Norman White Paper Assessment of W32/Virut, some variants can infect the HOSTS file and block access to security related web sites. Other variants of virut can even penetrate and infect .exe files within compressed files (.zip, .cab, rar). The Virux variant is an even more complex file infector which can embed an iframe into the body of web-related files and infect script files (.php, .asp, .htm, .html, .xml ). When Virut creates infected files, it also creates non-functional files that are corrupted beyond repair and in some instances can disable Windows File Protection. In many cases the infected files cannot be disinfected properly by your anti-virus. When disinfection is attempted, the files become corrupted and the system may become irreparable. The longer virut remains on a computer, the more critical system files will become infected and corrupt so the degree of infection can vary.

The virus disables Windows File Protection by injecting code into the "winlogon.exe" process that patches system code in memory.

CA Virus detail of W32/Virut

The virus has a number of bugs in its code, and as a result it may misinfect a proportion of executable files....some W32/Virut.h infections are corrupted beyond repair.

McAfee Risk Assessment and Overview of W32/Virut

There are bugs in the viral code. When the virus produces infected files, it also creates non-functional files that also contain the virus...Due to the damaged caused to files by virut it's possible to find repaired but corrupted files. They became corrupted by the incorrect writing of the viral code during the process of infection. undetected, corrupted files (possibly still containing part of the viral code) can also be found. this is caused by incorrectly written and non-function viral code present in these files.

AVG Overview of W32/VirutThis kind of infection is often contracted and spread by visiting remote, crack and keygen sites. These type of sites are infested with a smörgåsbord of malware and a major source of system infection.

...warez and crack web pages are being used by cybercriminals as download sites for malware related to VIRUT and VIRUX. Searches for serial numbers, cracks, and even antivirus products like Trend Micro yield malcodes that come in the form of executables or self-extracting files...quick links in these sites also lead to malicious files. Ads and banners are also infection vectors...

Keygen and Crack Sites Distribute VIRUX and FakeAV

However, the CA Security Advisor Research Blog have found MySpace user pages carrying the malicious Virut URL. Either way you can end up with a computer system so badly damaged that recovery is not possible and it cannot be repaired. When that happens there is nothing you can do besides reformatting and reinstalling the OS.

If your computer was used for online banking, has credit card information or other sensitive data on it, you should disconnect from the Internet until your system is cleaned. All passwords should be changed immediately to include those used for banking, email, eBay, paypal and online forums. You should consider them to be compromised. You should change each password using a clean computer and not the infected one. If not, an attacker may get the new passwords and transaction information. If using a router, you need to reset it with a strong logon/password so the malware cannot gain control before connect again. Banking and credit card institutions should be notified of the possible security breach. Because your computer was compromised please read:Since virut is not effectively disinfectable, your best option is to perform a full reformat as there is no guarantee this infection can be completely removed. In most instances it may have caused so much damage to your system files that it cannot be completely cleaned or repaired. In many cases the infected files cannot be deleted and anti-malware scanners cannot disinfect them properly. Many experts in the security community believe that once infected with this type of malware, the best course of action is to reformat and reinstall the OS. Reinstalling Windows without first wiping the entire hard drive with a repartition and/or format will not remove the infection. The reinstall will only overwrite the Windows files. Any malware on the system will still be there afterwards. Please read:
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#3 xbu

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Posted 09 November 2009 - 03:12 PM

Thanks a lot for this detailed information about virut.
It seems that the safest way is to reformat and reinstall.

But what about the second question : how can I know if the DVDs of my data are safe ?

#4 quietman7

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Posted 09 November 2009 - 03:33 PM

how can I know if the DVDs of my data are safe ?

Depends on what you have backed up on them.

With a Virut infection, there is always a chance of backed up data reinfecting your system. If the data is that important to you, then you can try to salvage some of it but there is no guarantee so be forewarned that you may have to start over again afterwards if reinfected by backed up data. Important documents, personal data files, and photos are usually safe.

If you backed up any executable files (*.exe), screensavers (*.scr), autorun (*.ini) or script files (.php, .asp, .htm, .html, .xml ) files, they may be infected by malware. Compressed files (.zip, .cab, .rar) that have executable files inside them can be infected too. Other types of malware may even disguise itself by adding and hiding its extension to the existing extension of file(s) so be sure you look closely at the full file name.

External drives are more susceptible to infection and can become compromised in the process of backing up data. I'm not saying you should not try using such devices but I want to make you aware of all your options and associated risks so you can make an informed decision if its worth that risk.

Again, if you have backed up any data with the following file extensions: exe, .scr, .ini, .htm, .html, .php, .asp, .xml, .zip, .rar, .cab, they may be infected.
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#5 xbu

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Posted 11 November 2009 - 03:10 AM

I will make a new backup of my data files (and only my data files), but this time I will use a safe computer and I will access the hard drive throuth a local ethernet connection.

Then I will format the drives and install a newly bought Windows 7. :thumbsup:
Then my computer should be safe again.

Thanks for your help

#6 quietman7

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Posted 11 November 2009 - 08:30 AM

You're welcome.

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

Keep Windows and Internet Explorer current with all critical updates from Microsoft which will patch many of the security holes through which attackers can gain access to your computer. If you're not sure how to do this, see Microsoft Update helps keep your computer current.

Avoid gaming sites, porn sites, pirated software, cracking tools, keygens, and peer-to-peer (P2P) file sharing programs (i.e. Limewire, eMule, uTorrent). 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. 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. Porn sites can lead to the Trojan.Mebroot MBR rootkit and other dangerous malware. 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 and infections install themselves, read:Keeping Autorun enabled on USB (pen, thumb, jump) and other removable drives has become a significant security risk due to the increasing number of malware variants that can infect them and transfer the infection to your computer. To learn more about this risk, please read:Many security experts recommend you disable Autorun asap as a method of prevention. Microsoft recommends doing the same.

...Disabling Autorun functionality can help protect customers from attack vectors that involve the execution of arbitrary code by Autorun when inserting a CD-ROM device, USB device, network shares, or other media containing a file system with an Autorun.inf file...

Microsoft Security Advisory (967940): Update for Windows Autorun

Other related reading sources:• Finally, if you need to replace your anti-virus, firewall or need a reliable anti-malware scanner please refer to:I recommend taking advantage of the Malwarebytes Anti-Malware Protection Module which uses advanced heuristic scanning technology to monitor your system and provide real-time protection to prevent the installation of most new malware. This technology monitors every process and stops malicious processes before they can infect your computer. Enabling the Protection Module feature requires reqistration and purchase of a license key that includes free lifetime upgrades and support. After activation, Malwarebytes can be set to update itself and schedule scans automatically on a daily basis. The Protection Module is not intrusive as it utilizes few system resources and should not conflict with other scanners or anti-virus programs.
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