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questions regarding virut in my computer


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#1 madoues

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Posted 06 January 2010 - 03:04 PM

Hi,

I found your site while googling for information on the virut virus. :thumbsup:

I'm wondering how badly my laptop is infected. It's an IBM T30(P4) laptop with XPpro on it.
I have disconnected that laptop from the internet for the time being and using another laptop for now.

The T30 has AVG antivirus installed on it and on december 31st when opening an exe file downloaded from the internet,
it reported and deleted a "win32/virut" virus infection from a USB memory stick, as I was trying out portable apps at the time. The virus was on a Google earth portable file. AVG seemed to catch it and delete it right away.

I didn't know anything about this virus at the time, so to be sure nothing else was infected, I ran a complete scan of the laptop a few days later. AVG found the same virus in another copy of this same file I had on c: of the laptop, but that I had not run yet. It deleted it, but it must have been in RAM or something because it deleted it from the same file four times in a row in a period of five minutes, while scanning. All these times AVG reported the Object and Process to be the same(Google earth portable). But then it deleted it once again, from the same Object, but from process C:\Windows\explorer.exe a few minutes later. :flowers: . This was two days ago.

Since then, it has been found and deleted three times, but all three times in the System Volume Information folder, in one of the restore point folders. Today, AVG warned me again that the virus is still in the SVI folder in a later RP folder, hence my research on the virus.

I read about how bad this virus is and that I may have to reformat and reinstall everything on the laptop. :inlove: :trumpet: :huh: :huh:


Questions:

If the virus is only found in the SVI by AVG, is it inactive unless I use system restore to restore to an earlier point?

If I use SR to restore to a point before I got the virus, are there any chances it will be gone?

Is it possible that AVG reports the virus infection deleted, but it has not really been deleted at all, or does the virus just automaticallly reinfect the same file?

Do you think AVG finds all infected files, IOW if I get to the point where AVG reports no infection after a scan,
does it really mean no files are infected? I realize it may still be in RAM at that point and will reappear later,
but in this case do you think AVG will generate an alert as soon as the virus reactivates again?

I guess the big question is, can this thing spreading like crazy, without AVG giving a warning, or will AVG warn me every timeit tries to spread?


I'm fairly computer literate, but no expert by any means. I hope these questions are legitimate questions.

Any help will be appreciated.

Dan

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#2 quietman7

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Posted 06 January 2010 - 03:29 PM

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 and Win32/Virut.17408 variants are an even more complex file infectors 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/VirutVirut is commonly spread via a flash drive (usb, pen, thumb, jump) infection using RUNDLL32.EXE and other malicious files. It 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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