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Trojan horse patched_c.lxt = Nasty


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22 replies to this topic

#1 BullwinkleJ

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Posted 15 July 2012 - 01:46 AM

Well, I got directed here after my first attempt to fix this problem,linked here.

It seems my Vista laptop has contracted the trojan patched_c.lxt problem.

AVG finds it but can't do anything about it.

One odd thing is that I've read this is a 32-bit system trojan and my OS is 64-bit. Not sure if that changes anything, but I thought I'd mention it.

Hopefully, someone here can help.

I'll post the results of the tests I ran to get things started.

TDSSKiller
Spoiler


AVAST
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ESET
Spoiler


Thanks in advance for the help!

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#2 CatByte

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Posted 15 July 2012 - 04:31 PM

Please do the following:

download Farbar Recovery Scan Tool and save it to a flash drive.

Plug the flashdrive into the infected PC.

Enter System Recovery Options.

To enter System Recovery Options from the Advanced Boot Options:
  • Restart the computer.
  • As soon as the BIOS is loaded begin tapping the F8 key until Advanced Boot Options appears.
  • Use the arrow keys to select the Repair your computer menu item.
  • Choose your language settings, and then click Next.
  • Select the operating system you want to repair, and then click Next.
  • Select your user account and click Next.
To enter System Recovery Options by using Windows installation disc:
  • Insert the installation disc.
  • Restart your computer.
  • If prompted, press any key to start Windows from the installation disc. If your computer is not configured to start from a CD or DVD, check your BIOS settings.
  • Click Repair your computer.
  • Choose your language settings, and then click Next.
  • Select the operating system you want to repair, and then click Next.
  • Select your user account an click Next.
On the System Recovery Options menu you will get the following options:
Startup Repair
System Restore
Windows Complete PC Restore
Windows Memory Diagnostic Tool
Command Prompt
[*]Select Command Prompt
[*]In the command window type in notepad and press Enter.
[*]The notepad opens. Under File menu select Open.
[*]Select "Computer" and find your flash drive letter and close the notepad.
[*]In the command window type e:\frst.exe (for x64 bit version type e:\frst64) and press Enter
Note: Replace letter e with the drive letter of your flash drive.
[*]The tool will start to run.
[*]When the tool opens click Yes to the disclaimer.
[*]Place a check next to List Drivers MD5 as well as the default check marks that are already there
[*]Press Scan button.
[*]FRST will let you know when the scan is complete and has written the FRST.txt to file, close out this message, then type the following into the search box:
services.exe
[*]now press the search button
[*]when the search is complete, search.txt will also be written to your USB
[*]type exit and reboot the computer normally
[*]please copy and paste both logs in your reply.(FRST.txt and Search.txt)[/list]

Microsoft MVP - 2010, 2011, 2012, 2013, 2014, 2015


#3 BullwinkleJ

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Posted 15 July 2012 - 05:11 PM

I'm running a 64-bit Vista OS, so I assume I should run the 64-bit FARBAR, yes?

#4 CatByte

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Posted 15 July 2012 - 05:44 PM

yes, that's correct

you will need the 64 bit version

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#5 BullwinkleJ

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Posted 16 July 2012 - 01:12 PM

Okay, here we go.

FRST
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Search
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#6 CatByte

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Posted 16 July 2012 - 01:53 PM

Hi,

Please run the following:

Open notepad (Start =>All Programs => Accessories => Notepad). Please copy the entire contents of the code box below. (To do this highlight the contents of the box, right click on it and select copy. Right-click in the open notepad and select Paste). Save it on the flashdrive as fixlist.txt

start
SubSystems: [Windows] ==> ZeroAccess
C:\Windows\Installer\{19a2a5f3-c061-7e4d-3c11-aec43a182be1}
C:\Windows\assembly\GAC_32\Desktop.ini
C:\Windows\assembly\GAC_64\Desktop.ini
replace: C:\Windows\winsxs\amd64_microsoft-windows-s..s-servicecontroller_31bf3856ad364e35_6.1.7600.16385_none_2b54b20ee6fa07b1\services.exe C:\Windows\System32\services.exe
end

NOTICE: This script was written specifically for this user, for use on this particular machine. Running this on another machine may cause damage to your operating system

Now please enter System Recovery Options then select Command Prompt

Run FRST (or FRST64 if you have the 64bit version) and press the Fix button just once and wait.
The tool will make a log on the flashdrive (Fixlog.txt) please post it to your reply.

Reboot Normally.




NEXT


Refer to the ComboFix User's Guide

  • Download ComboFix from the following location:

    Link

    * IMPORTANT !!! Place ComboFix.exe on your Desktop
  • Disable your AntiVirus and AntiSpyware applications, usually via a right click on the System Tray icon. They may otherwise interfere with ComboFix.
    You can get help on disabling your protection programs here
  • Double click on ComboFix.exe & follow the prompts.
  • Your desktop may go blank. This is normal. It will return when ComboFix is done. ComboFix may reboot your machine. This is normal.
  • When finished, it shall produce a log for you. Post that log in your next reply

    Note:
    Do not mouseclick combofix's window whilst it's running. That may cause it to stall.


    ---------------------------------------------------------------------------------------------
  • Ensure your AntiVirus and AntiSpyware applications are re-enabled.

    ---------------------------------------------------------------------------------------------

NOTE: If you encounter a message "illegal operation attempted on registry key that has been marked for deletion" and no programs will run - please just reboot and that will resolve that error.

Microsoft MVP - 2010, 2011, 2012, 2013, 2014, 2015


#7 BullwinkleJ

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Posted 16 July 2012 - 04:12 PM

Okay. I have done as asked. ComboFix was telling me it still detected AVG, even though I disabled it through the method described. Everything seemed to run okay, I just thought I should mention it.

I did get the "Illegal operation" error message.

FRST fixlog
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ComboFix
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Edited by BullwinkleJ, 16 July 2012 - 04:14 PM.


#8 CatByte

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Posted 16 July 2012 - 04:53 PM

AV: AVG Anti-Virus Free Edition 2012 *Enabled/Updated* {5A2746B1-DEE9-F85A-FBCD-ADB11639C5F0}
AV: Microsoft Security Essentials *Disabled/Updated* {9765EA51-0D3C-7DFB-6091-10E4E1F341F6}


more than one antivirus will cause system slowdowns, conflicts and crashes, please completely uninstall AVG, please use the removal tool to get rid of all the leftovers

http://www.avg.com/filedir/util/avg_arm_sup_____.dir/avgremover.exe


NEXT



Please download Malwarebytes' Anti-Malware
  • Double Click mbam-setup.exe to install the application.
  • Make sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
  • If an update is found, it will download and install the latest version.
  • Once the program has loaded, select "Perform Quick Scan", then click Scan.
  • The scan may take some time to finish, so please be patient.
  • When the scan is complete, click OK, then Show Results to view the results.
  • Make sure that everything is checked, and click Remove Selected. <-- very important
  • When disinfection is completed, a log will open in Notepad and you may be prompted to Restart. (See Extra Note)
  • The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.
  • Copy&Paste the entire report in your next reply.

Extra Note:If MBAM encounters a file that is difficult to remove, you will be presented with 1 of 2 prompts, click OK to either and let MBAM proceed with the disinfection process, if asked to restart the computer, please do so immediately.



NEXT


Go here to run an online scanner from ESET.
  • Turn off the real time scanner of any existing antivirus program while performing the online scan
  • Tick the box next to YES, I accept the Terms of Use.
  • Click Start
  • When asked, allow the activeX control to install
  • Click Start
  • Make sure that the option Remove found threats is unticked and the Scan Archives option is ticked.
  • Click on Advanced Settings, ensure the options Scan for potentially unwanted applications, Scan for potentially unsafe applications, and Enable Anti-Stealth Technology are ticked.
  • Click Scan
  • Wait for the scan to finish
  • When the scan completes, press the LIST OF THREATS FOUND button
  • Press EXPORT TO TEXT FILE , name the file ESETSCAN and save it to your desktop
  • Include the contents of this report in your next reply.
  • Press the BACK button.
  • Press Finish

Microsoft MVP - 2010, 2011, 2012, 2013, 2014, 2015


#9 BullwinkleJ

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Posted 17 July 2012 - 01:49 AM

MBAM
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ESET
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#10 CatByte

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Posted 17 July 2012 - 10:28 AM

we don't need to be concerned about the ESET detections, they are in quarantine already and this one is likely a false positive PC Tuneup 2011 (as long as you got it from a legitimate source)

Please do the following:

Press the WinKey + R to open a run box, then copy/paste the bolded text below > press Enter. A text file will pop up, please post the contents of that file.


"C:\Qoobox\Add-Remove Programs.txt" > uninstall.txt& start uninstall.txt

Please advise how the computer is running now and if there are any outstanding issues

Microsoft MVP - 2010, 2011, 2012, 2013, 2014, 2015


#11 BullwinkleJ

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Posted 17 July 2012 - 11:15 AM

Programs
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The only issue I see right off the bat is that Microsoft Security Essentials isn't working. I have a bright red icon for it in the tray. When I tried to start it, I got "The specified service does not exist as an installed service". Malwarebyte is also in the tray from one of the tests we did. I see that it's a trial version. Is there a reason to use it over AVG? I might not have known about this whole issue if AVG hadn't detected it, but I'll take advice from experts!

#12 CatByte

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Posted 17 July 2012 - 01:41 PM

Uninstall either AVG or Microsoft Security Essentials

Having more that one AV can causer system slow downs, conflicts and crashes

Microsoft Security Essentials will need to be uninstalled then reinstalled to resolve the issue of it not working anyway.

If you choose to uninstall AVG, then use the AVG removal tool to get all the leftovers

http://www.avg.com/filedir/util/avg_arm_sup_____.dir/avgremover.exe


personally I use Microsoft Security Essentials along with the Pro Version of Malwarebyes AntiMalware (which is an antimalware product not an antivirus) they work well together. There is a free version of Malwarebytes AntiMalware available

https://www.bleepingcomputer.com/download/malwarebytes-anti-malware//

NEXT


Your Java is out of date, so go to Start > Control Panel > Programs and Features > scroll down to the Java installation and Remove it, now download the latest Java version 7 update 5 and install it: http://java.com/en/download/index.jsp


let me know how that goes and if there are any other outstanding issues

Microsoft MVP - 2010, 2011, 2012, 2013, 2014, 2015


#13 BullwinkleJ

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Posted 17 July 2012 - 01:52 PM

Will do and thanks for the advice.

If no problems crop up, though, does it look like I'm in the clear?

#14 CatByte

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Posted 17 July 2012 - 01:54 PM

yes, if all is ok, then we have some housekeeping to do for removing all the tools we have used and I have some recommendations that I'll pass along

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#15 BullwinkleJ

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Posted 17 July 2012 - 03:19 PM

Woohoo! Thank you.

Java seems to have been uninstalled and reinstalled from that link fine, and Security Essentials has been deleted and installed again along with a pro version of Malwarebytes. I cleaned the computer of AVG in an earlier step here.




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