Jump to content


 


Register a free account to unlock additional features at BleepingComputer.com
Welcome to BleepingComputer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.


Click here to Register a free account now! or read our Welcome Guide to learn how to use this site.

Photo

Trojan Downloader Nurech


  • Please log in to reply
7 replies to this topic

#1 vsvs

vsvs

  • Members
  • 26 posts
  • OFFLINE
  •  
  • Gender:Male
  • Local time:07:34 AM

Posted 01 July 2009 - 09:36 PM

Posted Image

Help please, it keeps coming back whenever I restart my computer
Windows XP 32bit

Edited by vsvs, 01 July 2009 - 09:46 PM.


BC AdBot (Login to Remove)

 


#2 boopme

boopme

    To Insanity and Beyond


  • Global Moderator
  • 72,740 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:NJ USA
  • Local time:07:34 AM

Posted 01 July 2009 - 10:06 PM

Well this is the bad news.

Your system is infected with a nasty variant of Virut, 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. 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. Virux 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, and .html). When Virut creates infected files, it also creates non-functional files that are corrupted beyond repair. 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 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 contracted and spread by visiting remote, crack and keygen sites. These type of sites are infested with a smörgåsbord of malware and an increasing source of system infection. However, the CA Security Advisor Research Blog says they 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.

...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

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:There is no guarantee this infection can be completely removed. In some instances it may have caused so much damage to your system that it cannot be completely cleaned or repaired. The malware may leave so many remnants behind that security tools cannot find them. Many experts in the security community believe that once infected with this type of malware, the best course of action is to wipe the drive clean, 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:
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#3 Blade

Blade

    Strong in the Bleepforce


  • Site Admin
  • 12,702 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:US
  • Local time:07:34 AM

Posted 01 July 2009 - 10:07 PM

EDIT. . . boopme got here first.

Edited by Blade Zephon, 01 July 2009 - 10:08 PM.

Posted Image

If I am helping you, it has been 48 hours since your last post, and I have yet to reply to your topic, please send me a PM
Become a BleepingComputer fan: Facebook
Follow us on Twitter!
Circle us on Google+


#4 vsvs

vsvs
  • Topic Starter

  • Members
  • 26 posts
  • OFFLINE
  •  
  • Gender:Male
  • Local time:07:34 AM

Posted 01 July 2009 - 10:50 PM

Hi boop, I just started using this computer after about 3 months of inactivity. I didnt type any passwords or anything into it, but there are some really old passwords saved on my browser. Are those compromised too?
Also do you think theres a possibility that my antivirus could kill it off if I wait for a months worth of updates? Im going to be leaving for a month anyway and don't know whats the best thing to do ATM. Idk how to reformat, and at the same time this computer wont be on for the next month.

#5 boopme

boopme

    To Insanity and Beyond


  • Global Moderator
  • 72,740 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:NJ USA
  • Local time:07:34 AM

Posted 01 July 2009 - 11:31 PM

Hi..Reformatting,,
Not an unwise decision to make. In some instances an infection may have caused so much damage to your system that it cannot be completely cleaned or repaired. Wiping your drive,

reformatting, and performing a clean install of the OS or doing a factory restore removes everything and is the safest action but I cannot make that decision for you.

Reformatting a hard disk deletes all data. If you decide to reformat, you can back up all your important documents, data files and photos. The safest practice is not to backup

any autorun.ini or .exe files because they may be infected. Some types of malware may disguise itself by adding and hiding its extension to the existing extension of files so be

sure you take a close look at the full name. After reformatting, as a precaution, make sure you scan these files with your anti-virus prior to copying them back to your hard

drive.

The best proceedure is a low level format. This completely wipes the drive. Then reinstall the OS.
Use the free version of Active@ KillDisk.
Or Darik's Boot And Nuke

The best sources of Information on this are
Reformatting Windows XP
Michael Stevens Tech

Of course also feel free to ask anything on this in the XP forum. They'd be glad to help.
==============================
2 guidelines/rules when backing up

1) Backup all your important data files, pictures, music, work etc... and save it onto an external hard-drive. These files usually include .doc, .txt, .mp3, .jpg etc...
2) Do not backup any executables files or any window files. These include .exe's, .scr, .com, .pif etc... as they may contain traces of malware. Also, .html or .htm files that

are webpages should also be avoided.

Download Belarc Advisor - builds a detailed profile of your installed software and hardware, including Microsoft

Hotfixes, and displays the results in your Web browser.
Run it and then print out the results, they may be handy.




If you insist on trying to fix this infection instead of following our advice to reformat and reinstall your operating system, there are various rescue disks available from major anti-virus vendors which you can try. Keep in mind, even the vendors like Kaspersky say there is no quarantee that some files will not get corrupted during the disinfection process. In the end most folks end up reformatting out of frustration after spending hours attempting to repair and remove infected files. IMO the safest and easiest thing to do is just reformat and reinstall Windows.

Bleeping Computer DOES NOT assume any responsibility for your attempt to repair this infection using any of the following tools. You do this at your own risk and against our advice.

These are links to Anti-virus vendors that offer free LiveCD or Rescue CD files that are used to boot from for repair of unbootable and damaged systems, rescue data, scan the system for virus infections. Burn it as an image to a disk to get a bootable CD. All (except Avira) are in the ISO Image file format. Avira uses an EXE that has built-in CD burning capability.If you are not sure how to burn an image, please read How to write a CD/DVD image or ISO. If you need a FREE utility to burn the ISO image, download and use ImgBurn.
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#6 vsvs

vsvs
  • Topic Starter

  • Members
  • 26 posts
  • OFFLINE
  •  
  • Gender:Male
  • Local time:07:34 AM

Posted 02 July 2009 - 01:01 PM

Ive reformatted, but still need an answer about the passwords thing above.
How can I check that my system is clean now or that there are no unauthorized connections to my computer?
Thanks

#7 Blade

Blade

    Strong in the Bleepforce


  • Site Admin
  • 12,702 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:US
  • Local time:07:34 AM

Posted 02 July 2009 - 01:18 PM

Hello vsvs. . .

The safest thing to do is consider all your passwords compromised. Any and all information you had on that computer could have been copied off to a remote location. We have no way of knowing the extent of the information theft.

For checking your system I would suggest an Online scan

Please do an online scan with Kaspersky WebScanner

Click on Kaspersky Online Scanner

You will be prompted to install an ActiveX component from Kaspersky, Click Yes.
  • The program will launch and then begin downloading the latest definition files:
  • Once the files have been downloaded click on NEXT
  • Now click on Scan Settings
  • In the scan settings make sure that the following are selected:
    • Scan using the following Anti-Virus database:
    Extended (if available otherwise Standard)
    • Scan Options:
    Scan Archives
    Scan Mail Bases
  • Click OK
  • Now under select a target to scan:Select My Computer
  • This will program will start and scan your system.
  • The scan will take a while so be patient and let it run.
  • Once the scan is complete it will display if your system has been infected.
    • Now click on the Save as Text button:
  • Save the file to your desktop.
  • Copy and paste that information in your next post.
Hope that helps. ~Blade

In your next reply, please include the following:
KOS report

Edited by Blade Zephon, 02 July 2009 - 01:19 PM.

Posted Image

If I am helping you, it has been 48 hours since your last post, and I have yet to reply to your topic, please send me a PM
Become a BleepingComputer fan: Facebook
Follow us on Twitter!
Circle us on Google+


#8 vsvs

vsvs
  • Topic Starter

  • Members
  • 26 posts
  • OFFLINE
  •  
  • Gender:Male
  • Local time:07:34 AM

Posted 02 July 2009 - 07:53 PM

Report came back clean. I forgot to save it though, thanks for all the advice




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users