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Need Help On Trojan-downloader.win32.bagle.mm


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#1 imjscn

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Posted 21 June 2008 - 06:21 AM

Hello,
I've got a situation here:
I download and installed a MS Access Customer Template. My PC immediately reboot without asking me anything. When restarted, ZoneAlarm reported a virus and quarantined it. The name is
Trojan-Downloader.Win32.Bagle.mm,
C:/windows/system32/drivers/srosa.sys
My PC got greatly slow down.

Then, I tried to uninstall the MA Access Customer Template. But it didn't allow me. So I simply deleted its folder and reboot. This time, ZoneAlarm still report this virus and quarantined it. After checking around, I found my Gmail Notifer's icon changed to the MA Access Template's icon. So, I uninstalled Gmail Notifer and reboot. This time ZoneAlarm didn't report anything. Seems it had been cleaned.

I opened Windows/system32/drivers, I saw two file have the same icon as the MA Access Template. hldrrr.exe and mdelk.exe, I'm not sure if I can delete them or not because it's in system folder. So, I downloaded and installed a group of antivirus/antispyware to check things, finally SuperAntiSpyware identified them as virus and quarantined them, they are:

Trojan.Downloader_Gen
C:/windows/system32/drivers/mdelk.exe

unclassified.unkown orign/system
C:/windows/system32/drivers/hldrrr.exe

Now, my PC is working normally. But since ZoneAlarm detected only srosa and SuperAntiSpyware detected the other two, So I doubt whether or not the virus has been rooted out, maybe there are still something else passed both ZoneAlarm and SuperAntiSpyware?

Any suggestion?
Many thanks!

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#2 quietman7

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Posted 21 June 2008 - 07:11 AM

One or more of the identified infections is related to a rootkit component. Rootkits are very dangerous because they use advanced techniques (backdoors) as a means of accessing a computer system that bypasses security mechanisms and steal sensitive information which they send back to the hacker. Many rootkits can hook into the Windows 32-bit kernel, and patch several APIs to hide new registry keys and files they install. Remote attackers use backdoor Trojans and rootkits as part of an exploit to gain unauthorized access to a computer and take control of it without your knowledge.

If your computer was used for online banking, has credit card information or other sensitive data on it, you should immediately 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. They should be changed by using a different computer and not the infected one. If not, an attacker may get the new passwords and transaction information. Banking and credit card institutions should be notified of the possible security breach. Because your computer was compromised please read How Do I Handle Possible Identify Theft, Internet Fraud and CC Fraud?

Although the rootkit has been identified and may be removed, your PC has likely been compromised and there is no way to be sure the computer can ever be trusted again. It is dangerous and incorrect to assume that because the rootkit has been removed the computer is now secure. 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. Please read "When should I re-format? How should I reinstall?", "Help: I Got Hacked. Now What Do I Do?" and "Reformatting the computer or troubleshooting; which is best?".

Should you decide not to follow that advice, we will do our best to help clean the computer of any infections but we cannot guarantee it to be trustworthy or that the removal will be successful. If you wish to proceed, please do the following.

This is a serious infection that will require further investigation and probably the use of more powerful tools than we recommend in this forum. Before that can be done you will need you to create and post a hijackthis log.

Please read the pinned topic titled "Preparation Guide For Use Before Posting A Hijackthis Log" and complete all the steps. There are instructions for downloading and running Deckard's System Scanner (DSS) which will create a hijackthis log for you, or automatically download and install the most current version of HijackThis if it's not already installed on your computer.

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. 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.
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#3 imjscn

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Posted 21 June 2008 - 07:54 AM

Thanks very much! I almost believed that I was clean

I'm a dummy in computer, so I would take your first suggestion...formate! It's painful but might be less complicated than troubleshooting.

I have 2 harddisk, I install all the programs in C, save all documents in D. Can I formate C only, or should I formate both?

#4 imjscn

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Posted 21 June 2008 - 11:49 AM

I got a Trojan-Downloader.Win32.Bagle.mm , file was removed, but not sure whether or not the PC is clean, so I decide to formate.

I have 2 harddisk, I install all programe in C, save all document in D. My guess is D is not infected. Can I formate only C disk, or should I formate both C and D ?

Thanks!

Mod Edit:Topic Infected, Formate The Infected Disk Or Formate All The Disk? merged for continuity ~TMacK

Edited by TMacK, 21 June 2008 - 12:07 PM.


#5 DaChew

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Posted 21 June 2008 - 01:24 PM

http://www.kaspersky.com/virusscanner

this online scanner is very good at finding infected files, you could post it's log and see if it finds anything hiding on the D drive
Chewy

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#6 quietman7

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Posted 21 June 2008 - 01:43 PM

That's the decision I would have made if this were my system.

Some types of malware can result in a system so badly damaged that a Repair Install will NOT help!. 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. Starting over by wiping your drive, reformatting, and performing a clean install of the OS removes everything and is the safest action.

In case you need help with this, please review "How to partition and format a hard disk in Windows XP".

These links include step by step instructions:
"Clean Install Windows XP".
"Reformat & Clean Install Windows".
"XP Clean Install Interactive Setup".

Reformatting a hard disk deletes all data. If you decide to reformat, you should back up all your important documents, data files and photos. The safest practice is not to backup any .exe files because they may be infected. After reformatting, as a precaution, make sure you scan these files with your anti-virus prior to copying them back to your hard drive. Don't forget you will have to go to Microsoft Update and apply all Windows security patches.

Hard to tell what else may be on your D drive without further investigation as you can't be for certain what malware may have made its way there. You can try the Kaspersky scan as DaChew suggests but you need to be sure its clean before hooking it back up on a newly reformatted drive.

If you need additional assistance with reformatting, you can start a new topic in the Windows XP Home and Professional forum.
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#7 imjscn

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Posted 21 June 2008 - 06:27 PM

Thanks! An online scan might take hours, I'd better formate all. I should have save all my documents in online storage.

I've found this forum is so informative and supportive. Thanks for all the help!

#8 DaChew

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Posted 21 June 2008 - 07:35 PM

http://www.kaspersky.com/virusscanner

this online scanner is very good at finding infected files, you could post it's log and see if it finds anything hiding on the D drive




--------------------------------------------------------------------------------
KASPERSKY ONLINE SCANNER 7 REPORT
Saturday, June 21, 2008
Operating System: Microsoft Windows XP Professional Service Pack 3 (build 2600)
Kaspersky Online Scanner 7 version: 7.0.25.0
Program database last update: Sunday, June 22, 2008 00:02:43
Records in database: 880072
--------------------------------------------------------------------------------

Scan settings:
Scan using the following database: extended
Scan archives: yes
Scan mail databases: yes

Scan area - Folder:
C:\Documents and Settings

Scan statistics:
Files scanned: 10673
Threat name: 2
Infected objects: 2
Suspicious objects: 0
Duration of the scan: 00:06:10


File name / Threat name / Threats count
C:\Documents and Settings\Chewy\Application Data\Malwarebytes\Malwarebytes' Anti-Malware\Quarantine\QUAR1.75273 Infected: Trojan.Win32.VB.cng 1
C:\Documents and Settings\Chewy\Local Settings\Application Data\Mozilla\Firefox\Profiles\ur1k2l0l.default\Cache\82B500BDd01 Infected: Trojan-Downloader.Win32.Delf.ilx 1

The selected area was scanned.
Chewy

No. Try not. Do... or do not. There is no try.

#9 DaChew

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Posted 21 June 2008 - 09:18 PM

Well so much for safe surfing with firefox and no script

Edited by DaChew, 21 June 2008 - 09:18 PM.

Chewy

No. Try not. Do... or do not. There is no try.




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