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Trojan keeps recreating itself


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#1 sdotexe

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Posted 27 August 2011 - 08:05 PM

Hi, first time poster. My computer began acting slow, so I decided to scan it with Malware Bytes. It came up with 2 results near instantly. The trojan's name was "Kryptik.FUW" and was detected by NOD32 as well. I restarted my computer when prompted, thinking all was well, but when my computer booted back up, NOD32 gave the same notification. I saw the location of the file, "\Appdata\Roaming\Svchost\Svchost.exe", so I decided to go delete it manually. At first, it wouldn't let me because I needed permission even though I was administrator, so I downloaded a tool called "Unlocker" and did it. It deleted, then the Appdata folder reloaded, and the virus' folder came right back. I've been looking everywhere online and this virus has not been reported by anyone else, so I decided to come here. Thanks in advance.

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#2 boopme

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Posted 27 August 2011 - 08:36 PM

Hello is this Vista?

Did you update your Nod 32 and scan?

Please download the TDSS Rootkit Removing Tool (TDSSKiller.exe) and save it to your Desktop. <-Important!!!
Be sure to download TDSSKiller.exe (v2.5.9.0) from Kaspersky's website and not TDSSKiller.zip which appears to be an older version 2.3.2.2 of the tool.
  • Double-click on TDSSKiller.exe to run the tool for known TDSS variants.
    Vista/Windows 7 users right-click and select Run As Administrator.
  • If TDSSKiller does not run, try renaming it.
  • To do this, right-click on TDSSKiller.exe, select Rename and give it a random name with the .com file extension (i.e. 123abc.com). If you do not see the file extension, please refer to How to change the file extension.
  • Click the Start Scan button.
  • Do not use the computer during the scan
  • If the scan completes with nothing found, click Close to exit.
  • If malicious objects are found, they will show in the Scan results - Select action for found objects and offer three options.
  • Ensure Cure (default) is selected, then click Continue > Reboot now to finish the cleaning process.
  • A log file named TDSSKiller_version_date_time_log.txt (i.e. TDSSKiller.2.4.0.0_27.07.2010_09.o7.26_log.txt) will be created and saved to the root directory (usually Local Disk C:).
  • Copy and paste the contents of that file in your next reply.


If TDSSKiller does not run, try renaming it. To do this, right-click on TDSSKiller.exe, select Rename and give it a random name with the .com file extension (i.e. 123abc.com). If you do not see the file extension, please refer to these[/color] instructions. In some cases it may be necessary to redownload TDSSKiller and randomly rename it before downloading and saving to the computer.


Rerun MBAM (MalwareBytes) like this:

Open MBAM in normal mode and click Update tab, select Check for Updates,when done
click Scanner tab,select Quick scan and scan (normal mode).
After scan click Remove Selected, [color="#8B0000"]Post new scan log
and Reboot into normal mode.

Please ask any needed questions,post logs and Let us know how the PC is running now.
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 sdotexe

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Posted 27 August 2011 - 08:52 PM

Here is the mbam log:

Malwarebytes' Anti-Malware 1.51.1.1800
www.malwarebytes.org

Database version: 7588

Windows 6.1.7600
Internet Explorer 9.0.7930.16406

8/27/2011 9:50:21 PM
mbam-log-2011-08-27 (21-50-15).txt

Scan type: Quick scan
Objects scanned: 0
Time elapsed: 3 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 1
Files Infected: 0

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
c:\Users\j\AppData\Roaming\Svchost (Trojan.Agent.Gen) -> No action taken.

Files Infected:
(No malicious items detected)


TDSSkiller didn't find anything, I'm going to try to fix the MBR, in the meantime, do you have any more advice?

#4 boopme

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Posted 27 August 2011 - 09:23 PM

An online scan would also be good.
Are you fixing the MBR with GMER?

ESET Online Scan
Note: You can use either Internet Explorer or Mozilla FireFox for this scan. You will however need to disable your current installed Anti-Virus, how to do so can be read here.

Vista users: You will need to to right-click on the either the IE or FF icon in the Start Menu or Quick Launch Bar on the Taskbar and select Run as Administrator from the context menu.

  • Please go here then click on: Posted Image

    Note: If using Mozilla Firefox you will need to download esetsmartinstaller_enu.exe when prompted then double click on it to install.
    All of the below instructions are compatible with either Internet Explorer or Mozilla FireFox.

  • Select the option YES, I accept the Terms of Use then click on: Posted Image
  • When prompted allow the Add-On/Active X to install.
  • Make sure that the option Remove found threats is NOT checked, and the option Scan archives is checked.
  • Now click on Advanced Settings and select the following:
    • Scan for potentially unwanted applications
    • Scan for potentially unsafe applications
    • Enable Anti-Stealth Technology
  • Now click on: Posted Image
  • The virus signature database... will begin to download. Be patient this make take some time depending on the speed of your Internet Connection.
  • When completed the Online Scan will begin automatically.
  • Do not touch either the Mouse or keyboard during the scan otherwise it may stall.
  • When completed select Uninstall application on close if you so wish, make sure you copy the logfile first!
  • Now click on: Posted Image
  • Use notepad to open the logfile located at C:\Program Files\ESET\EsetOnlineScanner\log.txt.
  • Copy and paste that log as a reply to this topic.
Note: Do not forget to re-enable your Anti-Virus application after running the above scan!


NOTE: In some instances if no malware is found there will be no log produced.

Edited by boopme, 27 August 2011 - 09:23 PM.

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 sdotexe

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Posted 27 August 2011 - 09:33 PM

I will be using the Windows 7 installation disc to do it, unless you have a better suggestion. I'm currently scanning with malwarebytes because it doesn't seem to be replicating itself, I'll do the online scanner and provide you with the log once the mbam scan finishes.

#6 boopme

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Posted 27 August 2011 - 09:36 PM

A suggestion...


To check for and confirm the MBR (Master Boot Record) rootkit.


Please download mbr.exe and save it to the root directory, usually C:\ <- (Important!).
  • Go to Start > Run and type: cmd.exe
  • press Ok.
  • At the command prompt type: c:\mbr.exe >>"C:\mbr.log"
  • press Enter.
  • The process is automatic...a black DOS window will open and quickly disappear. This is normal.
  • A log file named mbr.log will be created and saved to the root of the system drive (usually C:\).
  • Copy and paste the results of the mbr.log in your next reply.
If you have a problem using the command prompt, you can just double-click on mbr.exe to run the tool.
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 sdotexe

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Posted 27 August 2011 - 09:42 PM

Stealth MBR rootkit/Mebroot/Sinowal/TDL4 detector 0.4.2 by Gmer, http://www.gmer.net
Windows 6.1.7600

device: opened successfully
user: error reading MBR
error: Read The handle is invalid.
kernel: error reading MBR


perhaps I did something wrong? I put it into C:\, ran cmd as administrator and typed the command exactly.

#8 boopme

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Posted 27 August 2011 - 09:51 PM

If its 64 bit Win7 it may not run
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

#9 sdotexe

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Posted 27 August 2011 - 09:51 PM

If its 64 bit Win7 it may not run

Yeah, my computer is 64bit Windows 7. Do you have any other alternatives?

#10 sdotexe

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Posted 27 August 2011 - 10:31 PM

Okay, I think I managed to fix it.

For anyone in the future who sees this post through Google or searching through these forums, here's what I did.

After realizing that the file would recreate itself time and time again, I decided to use TDSSKiller and Rkill. They came up with nothing. Then, I disabled all network traffic using ESET Smart Security. After another quick scan from Malwarebytes, I deleted the files again, hoping that they won't come back. Suprisingly, the fake svchost.exe was gone. It didn't replicate. At this point, I decided to run a full system scan. It found a couple of other false positives, and I found out that the legitimate Svchost.exe was infected, and so was explorer.exe(which makes sense, because when I first noticed the virus, explorer.exe stopped working and I couldn't open task manager, so I'm guessing it was infecting it at that point.)

I cleaned both files, and restarted my computer. Now I don't see anything else and my CPU usage is back to regular levels (10-15% as opposed to the 40% from before). I'm going to do one more scan and do a disk defrag.

Thanks, boopme, couldn't have done it without you :thumbsup: .

#11 boopme

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Posted 27 August 2011 - 10:35 PM

Great work!! If there are no more problems or signs of infection, you should Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been backed up, renamed and saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back" to a clean working state.

The easiest and safest way to do this is:
  • Go to Posted Image > Programs > Accessories > System Tools and click "System Restore".
  • Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
  • Then use Disk Cleanup to remove all but the most recently created Restore Point.
  • Go to Posted Image > Run... and type: Cleanmgr
  • Click "Ok". Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" tab, then click the "Clean up" button under System Restore.
  • Click Ok. You will be prompted with "Are you sure you want to delete all but the most recent restore point?"
  • Click Yes, then click Ok.
  • Click Yes again when prompted with "Are you sure you want to perform these actions?"
  • Disk Cleanup will remove the files and close automatically.
Vista and Windows 7 users can refer to these links:
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

#12 sdotexe

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Posted 27 August 2011 - 10:46 PM

For some reason, Windows is not allowing me to do that. It is saying that

A writer did not respond to the GatherWriterStatus call. The writer may have either been terminated or may be stuck. Check the System and Applications event logs for more information. (0x80042319)

Do you have any remedies?

#13 boopme

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Posted 28 August 2011 - 08:42 PM

Sorry, I don't know what that is?? Ask in Win7,they should know.
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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