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Medfos.b Trojan - Help!


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15 replies to this topic

#1 KelinaSyle

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Posted 29 December 2012 - 11:08 AM

Hello everyone,

My laptop has just today been afflicted by the abovementioned Trojan (medfos.B ). It seems that Microsoft Security Essentials isn't able to successfully remove the trojan, but merely reminds me of its presence (and quarantines it) every few minutes.

A quick search on Google suggests that it only affects Google Chrome users, but I don't use this browser (I use IE exclusively).

The virus hasn't done anything thus far (that I know of!) other than the annoyance mentioned above, but I'm worried for the security of my data while it lives and breathes in my system.

If any of the experts on this board would be kind enough to provide me with easy-to-follow steps for the removal of this trojan I would be hugely appreciative. Thanks in advance!

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#2 CatByte

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Posted 29 December 2012 - 11:23 AM

Please do the following:

Please download DDS from either of these links

LINK 1
LINK 2

and save it to your desktop.
  • Disable any script blocking protection
  • Double click dds to run the tool.
  • When done, two DDS.txt's will open.
  • Save both reports to your desktop.
---------------------------------------------------
Please include the contents of the following in your next reply:

DDS.txt
Attach.txt.


NEXT

Please download aswMBR to your desktop.
  • Double click the aswMBR.exe icon to run it
  • When asked if you want to download Avast's virus definitions please select Yes.
  • Click the Scan button to start the scan
  • On completion of the scan, click the save log button, save it to your desktop and post it in your next reply.
  • You will also notice another file created on the desktop named MBR.dat. Right click that file and select Send To>Compressed (zipped) file. Attach that zipped file in your next reply as well

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#3 KelinaSyle

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Posted 29 December 2012 - 09:37 PM

Hello,

I've attached the files with my message. I tried to upload the zipped MBR.dat file, but it didn't allow me to do so (Error: You aren't permitted to upload this kind of file) - uploading the raw .dat file doesn't seem to work either.

I can upload it to a third-party file hosting site, or if there's something else I'm not doing right, please let me know as well.


Thanks!

Attached Files



#4 CatByte

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Posted 29 December 2012 - 09:56 PM

I tried to upload the zipped MBR.dat file, but it didn't allow me to do so (Error: You aren't permitted to upload this kind of file)

that's odd, as usually compressing the file to a "zipped" format changes the extension to .zip which should permit the upload. Just save it to a flash drive for now.

please run the following:

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.

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#5 KelinaSyle

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Posted 30 December 2012 - 12:46 AM

Hi,

I'm facing some weird issues after running ComboFix that I'd really appreciate some (hopefully urgent) help with.

Right now I'm unable to run any programs that require an Internet connection (even though my Windows system tray shows that I'm connected with Internet access to my WiFi connection). When I attempt to run Internet Explorer (for instance), the program shows a white screen, then appears to automatically terminate after approximately 30 seconds. Running ICQ or Skype, the program opens but is never able to connect to the respective servers.

Here is the sequence of events (as best as I can remember) after running ComboFix:

1) I ran ComboFix, and was able to save the log (attached with this message) - it then automatically rebooted my system.
2) Upon rebooting, my system was unable to run any programs. After a couple of reboots (including to Windows Safe mode), that error was resolved and I was able to boot into Windows normal mode, AND run programs.
3) However, running any program that requires Internet generated one of these errors: 'unable to bind to port 8010 for data transfer', or 'an error occured loading tcp/ip'. This is in Windows normal mode.
4) I rebooted my system again, and these errors are now gone, but I still cannot run any connection-required programs (this stage is where I am at currently).

Any further guidance will be GREATLY appreciated!

EDIT:

5) I'm still getting this error: 'an error occured loading tcp/ip'. Amongst other situations, I get this error when I try to use Windows Live Mail, and hit 'Send/Receive' to check my mail.

Thanks again!

Attached Files


Edited by KelinaSyle, 30 December 2012 - 12:50 AM.


#6 KelinaSyle

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Posted 30 December 2012 - 01:47 AM

UPDATE:

I rebuilt the TCP/IP stacks in my PC and rebooted, and Internet is now working fine. *phew*

Please see attached with my previous message the ComboFix log, and let me know the next step in the removal of this massively annoying trojan.

Thank you!

#7 CatByte

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Posted 30 December 2012 - 11:29 AM

ok good, I'm glad you were able to resolve that issue, the infection is known to corrupt the TCP/IP stack, so good for you for knowing how to fix it

(what did you do exactly for any guests reading this threads who may have the same issue)


Please run the following:

Please download Junkware Removal Tool to your desktop.
  • Shutdown your antivirus to avoid any conflicts.
  • Right-mouse click JRT.exe and select Run as administrator
  • The tool will open and start scanning your system.
  • Please be patient as this can take a while to complete.
  • On completion, a log (JRT.txt) is saved to your desktop and will automatically open.
  • Post the contents of JRT.txt into your next message


NEXT


Download AdwCleaner from here and save it to your desktop.
  • Run AdwCleaner and select Delete
  • Once done it will ask to reboot, allow the reboot
  • On reboot a log will be produced, please attach the content of the log to your next reply


NEXT

  • Please open your MalwareBytes AntiMalware Program
  • Click the Update Tab and search for updates
  • 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

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#8 KelinaSyle

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Posted 30 December 2012 - 09:19 PM

Hi there,

I googled 'rebuild TCP/IP stack', and followed these instructions:

TCP/IP stack repair options for use with Vista or 7.

Start, Programs\Accessories and right click on Command Prompt, select "Run as Administrator" to open a command prompt.

Reset WINSOCK entries to installation defaults: netsh winsock reset catalog

Reset IPv4 TCP/IP stack to installation defaults. netsh int ipv4 reset reset.log

Reset IPv6 TCP/IP stack to installation defaults. netsh int ipv6 reset reset.log

Reboot the machine.

After the reboot everything was working fine, like it was just before ComboFix.

I've attached the logs from the various programs as per your instructions, please let me know what's next!

Thank you.

Attached Files



#9 CatByte

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Posted 30 December 2012 - 09:52 PM

we have a few items to remove still, but I'd like to use OTL

please run the following:

Download OTL to your Desktop
  • Double click on the icon to run it. Make sure all other windows are closed and to let it run uninterrupted.
  • Select All Users
  • Under the Custom Scan box paste this in
    netsvcs
    %SYSTEMDRIVE%\*.exe
    /md5start
    explorer.exe
    winlogon.exe
    Userinit.exe
    svchost.exe
    services.exe
    /md5stop
    %systemroot%\*. /rp /s
    %systemdrive%\$Recycle.Bin|@;true;true;true /fp
    DRIVES
    CREATERESTOREPOINT
  • Click the Quick Scan button. Do not change any settings unless otherwise told to do so. The scan wont take long.
  • When the scan completes, it will open two notepad windows. OTL.Txt and Extras.Txt. These are saved in the same location as OTL.
  • Post both logs

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#10 KelinaSyle

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Posted 31 December 2012 - 01:55 AM

Hello,

I've followed your instructions and attached the 2 log files as requested.

Awaiting your further instructions, thanks!

Attached Files



#11 CatByte

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Posted 31 December 2012 - 09:11 AM

Please run the following:

Run OTL.exe
  • Copy/paste the following text written inside of the code box into the Custom Scans/Fixes box located at the bottom of OTL

    :OTL
    IE - HKCU\..\URLSearchHook:  - No CLSID value found
    IE - HKCU\..\SearchScopes\{BC79CD63-2A51-4E5C-8A80-A758EED8F722}: "URL" = http://websearch.ask.com/redirect?client=ie&tb=SPC2&o=15004&src=kw&q={searchTerms}&locale=en_US&apn_ptnrs=PW&apn_dtid=YYYYYYYYUS&apn_uid=8888A9FF-4917-442A-B4EC-B5C832C458E9&apn_sauid=4D07975A-A76E-4A73-BFCF-D21FAA5C3447
    IE - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings: "ProxyOverride" = <local>;*.local
    O4 - HKLM..\Run: []  File not found
    [2012/12/24 11:03:35 | 000,000,000 | ---D | C] -- C:\Users\Vaio\AppData\Roaming\Yllet
    [2012/12/24 11:03:34 | 000,000,000 | ---D | C] -- C:\Users\Vaio\AppData\Roaming\Vyotx
    [2012/12/24 11:03:34 | 000,000,000 | ---D | C] -- C:\Users\Vaio\AppData\Roaming\Orkeo
    [2012/12/29 23:17:31 | 000,006,526 | ---- | C] () -- C:\Users\Vaio\AppData\Local\2ad3c912-81c8-4778-b544-f976b9251281.crx
    
    :files
    C:\Users\Vaio\Downloads\cnet2_MultiSkypeLauncher_setup_exe.exe
    ipconfig /flushdns /c
    
    :Commands
    [resethosts]
    [emptytemp]
    [Reboot]
  • Then click the Run Fix button at the top
  • Let the program run unhindered, reboot when it is done
  • Then post the OTL log


NEXT


Visit ADOBE and download the latest version of Acrobat Reader (version XI)
Having the latest updates ensures there are no security vulnerabilities in your system.

NEXT

Posted Image
Your Java is out of date. Older versions have vulnerabilities that malware can use to infect your system. Please follow these steps to remove older version Java components and update.
  • Download the latest version of Java Runtime Environment (JRE) 7 and Save it to your Desktop.
  • Scroll down to where it says Java SE 7u10
  • Click the Download button under JRE to the right.
  • Read the License Agreement then select Accept License Agreement
  • Click on the link to download Windows x86 Offline and save the file to your desktop.
  • Close any programs you may have running - especially your web browser.
  • Go to Start > Control Panel, double-click on Add or Remove Programs and remove all older versions of Java.
  • Check (highlight) any item with Java Runtime Environment (JRE or J2SE or Java™ 6) in the name.
  • Click the Remove or Change/Remove button.
  • Repeat as many times as necessary to remove each Java versions.
  • Reboot your computer once all Java components are removed.
  • Then from your desktop double-click on jre-7u10-windows-i586.exe to install the newest version.
  • After the install is complete, go into the Control Panel (using Classic View) and double-click the Java Icon. (looks like a coffee cup)
  • On the General tab, under Temporary Internet Files, click the Settings button.
  • Next, click on the Delete Files button
  • There are three options in the window to clear the cache - Leave these two Checked

    Trace and Log Files
    Cached Applications and Applets
  • Click OK on Delete Temporary Files Window
    Note: This deletes ALL the Downloaded Applications and Applets from the CACHE.
  • Click OK to leave the Temporary Files Window
  • Click OK to leave the Java Control Panel.
[/list]

NEXT


Please let me know if there are any outstanding issues

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


#12 KelinaSyle

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Posted 31 December 2012 - 01:00 PM

Hi,

I've attached the log file as instructed with this message.

I'm still using my PC now and will report in if I notice any errors, in the meantime please let me know what's the next step to take. Thanks again!

Attached Files



#13 CatByte

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Posted 31 December 2012 - 05:15 PM

If there are no further issues, then we can clean up our tools


You can delete the DDS and aswMBR logs and programs from your desktop.


NEXT


Follow these steps to uninstall Combofix

  • Make sure your security programs are totally disabled.
  • Press the WinKey +R to open a run box
  • Now copy/paste Combofix /uninstall into the runbox and click OK. Note the space between the ..X and the /U, it needs to be there.

Posted Image


NEXT

  • Double click on adwcleaner.exe to run the tool.
  • Click on Uninstall.
  • Confirm with yes.


NEXT


Clean up with OTL:
  • Double-click OTL.exe to start the program.
  • Close all other programs apart from OTL as this step will require a reboot
  • On the OTL main screen, press the CLEANUP button
  • Say Yes to the prompt and then allow the program to reboot your computer.


If there are any logs/tools remaining on your desktop > right click and delete them.


NEXT


Below I have included a number of recommendations for how to protect your computer against malware infections.

  • It is good security practice to change your passwords to all your online accounts on a fairly regular basis, this is especially true after an infection. Refer to this Microsoft article
    Strong passwords: How to create and use them
    Then consider a password keeper, to keep all your passwords safe. KeePass is a small utility that allows you to manage all your passwords.

  • Keep Windows updated by regularly checking their website at :
    http://windowsupdate.microsoft.com/
    This will ensure your computer has always the latest security updates available installed on your computer.

  • Make Internet Explorer more secure
    • Click Start > Run
    • Type Inetcpl.cpl & click OK
    • Click on the Security tab
    • Click Reset all zones to default level
    • Make sure the Internet Zone is selected & Click Custom level
    • In the ActiveX section, set the first two options ("Download signed and unsigned ActiveX controls) to "Prompt", and ("Initialize and Script ActiveX controls not marked as safe") to "Disable".
    • Next Click OK, then Apply button and then OK to exit the Internet Properties page.

  • Download TFC to your desktop
    • Close any open windows.
    • Double click the TFC icon to run the program
    • TFC will close all open programs itself in order to run,
    • Click the Start button to begin the process.
    • Allow TFC to run uninterrupted.
    • The program should not take long to finish it's job
    • Once its finished it should automatically reboot your machine,
    • if it doesn't, manually reboot to ensure a complete clean
    It's normal after running TFC cleaner that the PC will be slower to boot the first time.

  • WOT, Web of Trust, warns you about risky websites that try to scam visitors, deliver malware or send spam. Protect your computer against online threats by using WOT as your front-line layer of protection when browsing or searching in unfamiliar territory. WOT's color-coded icons show you ratings for 21 million websites, helping you avoid the dangerous sites:
    • Green to go
    • Yellow for caution
    • Red to stop
    WOT has an addon available for both Firefox and IE

  • Keep a backup of your important files - Now, more than ever, it's especially important to protect your digital files and memories. This article is full of good information on alternatives for home backup solutions.

  • ERUNT (Emergency Recovery Utility NT) allows you to keep a complete backup of your registry and restore it when needed. The standard registry backup options that come with Windows back up most of the registry but not all of it. ERUNT however creates a complete backup set, including the Security hive and user related sections. ERUNT is easy to use and since it creates a full backup, there are no options or choices other than to select the location of the backup files. The backup set includes a small executable that will launch the registry restore if needed.

  • In light of your recent issue, I'm sure you'd like to avoid any future infections. Please take a look at these well written articles:
    PC Safety and Security--What Do I Need?.
  • Simple and easy ways to keep your computer safe and secure on the Internet

Thank you for your patience, and performing all of the procedures requested.

Please respond one last time so we can consider the thread resolved and close it, thank-you.

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


#14 KelinaSyle

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Posted 01 January 2013 - 07:40 AM

Hi,

I've been using my PC for the past day or so and everything is clean. Absolutely amazing.

Thanks for all the help rendered, and I've sent over a small token of my appreciation as well.

#15 CatByte

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Posted 01 January 2013 - 09:05 AM

thank-you very much and you are welcome

stay safe :hello:

~CB

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





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