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Avira Antivir: Delete Autorun.bat? Many Detections...


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#1 A.B.

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Posted 27 September 2007 - 11:53 PM

Hi,

I am on an office computer which did not have an Antivirus-Program for a longer time. I want to make the the computer secure, but as I am not much into computers and don't want to destroy anything, I am asking for your advice.

I now downloaded Avira AntiVir Version 7.06.00.270 and run a scan. It detected several malware but I'm not sure whether I can just delete them. It detected e.g. autoran.bat, autorun.inf, autorun.vbs as they "contain detection pattern of the VBS script virus VBS/Small.K"
The programm also detected Trojan horses TR/Ylob.CA.28 and TR/PCK.PolyCrypt.D.220 (latter seems to be related to some online game).

As I was not sure whether these are really harmful programms, and I read in some forum that deleting the autorun-files may result in serious other problems, I ignored them. However, especially the autorun-detections kept on coming 188 times... so I finally stopped the scan just before getting crazy :thumbsup: .

Can anyone give me hints to resolve the problem? I would be VERY grateful... I am just very unsure what to do and as it is not my own computer I do not want to take risks.

Thank you so much,

Almut.

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#2 buddy215

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Posted 28 September 2007 - 08:56 AM

You can allow Avira to quarantine whatever it finds.
You have many serious infections according to the scan results.

Super Antispyware should remove the Zlob (you posted ylob-maybe a typo) and many others.
Install Super Antispyware. Run it in safe mode. Allow it to quarantine whatever it finds.
http://www.superantispyware.com/

You should post a Hijack This log and let the experts help you to clean the computer. Follow the directions in the link below
and post the HJT log in the HJT Forum. DO NOT post the log in this forum.
http://www.bleepingcomputer.com/forums/t/34773/preparation-guide-for-use-before-using-malware-removal-tools-and-requesting-help/

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#3 quietman7

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Posted 28 September 2007 - 11:33 AM

From what you describe, it appears you may have a flash drive infection in addition to others.

Flash drive infections usually involve malware that loads an autorun.inf file into the root folder of all drives (internal, external, removable) and automatically executes a malicious autorun.bat file which calls wscript.exe to run autorun.vbs on your computer. When a flash drive becomes infected, the Trojan will infect a system when the flash drive is inserted if autorun has not been disabled.

Please insert your flash drives.

Reconfigure Windows XP to show hidden files, folders. Double-click on My Computer, go to Tools > Folder Options and click on the View tab. Under Hidden Files and Folders, check "Show hidden files and Folders", uncheck "Hide Protected operating system Files (recommended)", uncheck "Hide file extensions for known file types", and hit Apply > OK.

Open my computer and the drive of your flash drive, search for any autorun.inf, autoran.bat, autorun.vbs files on your drives and delete all of them.

An easy way to do this is, click Start > Search > Click "All Files and Folders".
Under "Advanced Options", make sure the following are checked:
  • Search System Folders.
  • Search Hidden Files And Folders.
  • Search Subfolders.
Then copy and paste the following into the search box: autorun.inf
Click Search to find and delete all instances of these files.

Repeat and search for: autoran.bat
Again, delete all instances of these files, then repeat once more for autoran.vbs. Then empty your recycle bin.

Now download Flash_Disinfector.exe by sUBs and save it to your desktop.
  • Double-click Flash_Disinfector.exe to run it and follow any prompts that may appear.
  • Wait until it has finished scanning and then exit the program.
  • The utility may ask you to insert your flash drive and/or other removable drives. Please do so and allow the utility to clean up those drives as well.
  • Reboot your computer when done.
Note: Flash_Disinfector will create a hidden folder named autorun.inf in each partition and every USB drive plugged in when you ran it. Don't delete this folder...it will help protect your drives from future infection.
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#4 A.B.

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Posted 02 October 2007 - 10:33 PM

Hi,

thank you for your replies so far!

I think I will start with Super Antyspyware and then continue with a Hijack This log. I believe the computer has several severe problems and you really have to look inside to find out what's going on... .
I will see when I will find the opportunity to work on it and then I will post some news.

Thanks so much for your help here!

Almut.

#5 quietman7

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Posted 03 October 2007 - 07:25 AM

Your welcome.

Its the autorun files causing the problem and they need to be dealt with first. SUPERAntispyware will probably not be effective against this infection but it certainly is an excellent program for scanning/removing a lot of other malware.

If you want to post a hijackthis log, please read and follow all instructions in the pinned topic titled "Preparation Guide For Use Before Posting A Hijackthis Log". You may have performed some of these steps already. If you can't perform a step, then skip and continue with the next. In step #9 there are instructions for downloading HijackThis and creating a log. (This is a self-extracting version which will automatically install HJT in the proper location.)

When you have done that, post your log in the HijackThis Logs and Malware Removal forum, NOT here, for assistance by the HJT Team Experts. A member of the Team will walk you through, step by step, on how to clean your computer. If you post your log back in this thread, the response from the HJT Team will be delayed because your post will have to be moved. This means it will fall in line behind any others posted that same day.

Start a new topic, give it a relevant title and post your log along with a brief description of your problem, a summary of any anti-malware tools you have used and a summary of any steps that you have performed on your own. Please include the top portion of the HijackThis log that lists version information. An expert will analyze your log and reply with instructions advising you what to fix. After doing this, we would appreciate if you post a link to your log back here so we know that your getting help from the HJT Team.

Please be patient. It may take a while to get a response because the HJT Team members are very busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT "bump" your post or make another reply until it has been responded to by a member of the HJT Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another HJT Team member is already assisting you and not open the thread to respond.

Good luck.
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