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Trojan horse BackDoor Infection


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#1 Fruit

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Posted 26 March 2013 - 02:14 PM

Hello,

 

2 days ago, I decided to run a regular virus scan and unexpectedly, my computer was infected with “Trojan horse Generic32.MKY”. It was removed after the scan by AVG.

 

Then later, AVG popped out and said it detected another one of the same infection, which was removed afterwards as well. The virus didn’t affect my computer performance therefore I didn’t know my computer was infected.

 

I was worried that that there were more Trojans because the second Trojan wasn’t detected from the scan. So I scanned my computer with AVG, Malwarebytes, ESET Online Scanner and Superantispyware.

 

All came out clean so I thought the problem was over…

 

 

 

Today, while I was surfing the internet, my webpage suddenly redirected when I didn’t click anything. The page started to load Java so I ended it with task manager because apparently clicking close didn’t work. AVG popped out a “Multiple threat detection” and found 2 “Trojan horse BackDoor.Generic15.BYNL”, which I clicked move to vault. An AVG Identity Protection window also popped out and it said “IDP.Generic.3035C45D” at threat name. So I removed it and restarted my computer as suggested.

 

I received a “Threat Removal Completed” window when it finished restarting. The summary page said 1 process was terminated and 4 files were deleted.

 

 

However I don’t think I should assume that my computer is clean now just like it wasn’t 2 days ago.

 

 

OS: Windows XP

 

Thank you so much for your help!



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#2 boopme

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Posted 26 March 2013 - 02:58 PM

Hello, I feel it important you know this...
 
One or more of the identified infections is a backdoor trojan.

This allows hackers to remotely control your computer, steal critical system information and download and execute files.

I would counsel you to disconnect this PC from the Internet immediately. If you do any banking or other financial transactions on the PC or if it should contain any other sensitive information, please get to a known clean computer and change all passwords where applicable, and it would be wise to contact those same financial institutions to apprise them of your situation.

Though the trojan has been identified and can be killed, because of it's backdoor functionality, your PC is very likely compromised and there is no way to be sure your computer can ever again be trusted. Many experts in the security community believe that once infected with this type of trojan, the best course of action would be a reformat and reinstall of the OS.

Please read these for more information:
How Do I Handle Possible Identify Theft, Internet Fraud and CC Fraud?
When Should I Format, How Should I Reinstall

We can still clean this machine but I can't guarantee that it will be 100% secure afterwards. Let me know what you decide to do.
 
 
 
If you decide to clean it then,
we should get a deeper look. Please follow this Preparation Guide and post in a new topic.
Let me know if all went well.

Include this link back to here...
 
http://www.bleepingcomputer.com/forums/t/489889/trojan-horse-backdoor-infection/

Edited by boopme, 26 March 2013 - 03:01 PM.

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#3 Fruit

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Posted 26 March 2013 - 03:09 PM

Would a system restore to an older point work?

 

And if I do a reformat and reinstall, my computer can be secured again without cleaning it now?



#4 boopme

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Posted 26 March 2013 - 03:25 PM

Would a system restore to an older point work?

 

This is also not guaranteed. A rootkit feed a backdoor may be installed and actually remain and then return later

 

 

And if I do a reformat and reinstall, my computer can be secured again without cleaning it now?

 

This is guaranteed


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

#5 Fruit

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Posted 26 March 2013 - 03:36 PM

Because there are some important documents on my computer, is it dangerous for me to transfer them to a usb before the reformat?

 

 

Sorry for asking so many questions.



#6 boopme

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Posted 26 March 2013 - 03:38 PM

Hello Fruit...

Starting over by wiping your drive, and reformatting it removes everything and ensures no remnants of malicious files are left behind.

When reformatting due to malware infection, you can back up all your important documents, personal data files, photos to a CD or DVD drive, not a flash drive or external hard drive as they may become compromised in the process. The safest practice is not to backup any executable files (*.exe), screensavers (*.scr), dynamic link library (*.dll), autorun (.ini) or script files (.php, .asp, .htm, .html, .xml ) files because they may be infected by malware. Avoid backing up compressed files (.zip, .cab, .rar) that have executables inside them as some types of malware can penetrate compressed files and infect the .exe files within them. Other types of malware may even disguise itself by hiding a file extension or adding to the existing extension as shown here (click Figure 1 to enlarge) so be sure you look closely at the full file name. If you cannot see the file extension, you may need to reconfigure Windows to show file name extensions. Then make sure you scan the backed up data with your anti-virus prior to to copying it back to your hard drive.

If your CD/DVD drive is unusable, another word of caution if you are considering backing up to an external usb hard drive as your only alternative. 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.
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

#7 Fruit

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Posted 26 March 2013 - 07:19 PM

Understood. Thank you very much!



#8 boopme

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Posted 26 March 2013 - 07:41 PM

You are most welcome!


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




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