Tech Stuffs

Damn you Brontok!

What is Brontok? It’s a virus from the I-worm family. The virus is spread through the network so basically all the pc in a single network will be infected immediately once the infected pc connects into the network. What it does is creating new files which looked like a folder but its actually a .exe file. Unless you’ve enabled the view extensions in the folder options or else you won’t see the .exe extension of the file. The files are approximately 43.7Kb each and normally people will click to open them because they looked like a folder. So after you’ve open it, the virus will run each time during startup and keep on spreading and spreading… into the hard drives.

More troubles coming up. Normally when you click “Tools” in explorer, there’s a “folder options” underneath it. Once the pc is infected with the virus, the Folder Options will be missing, which disabled you to change the options to view the extension of the files. So when you see a new folder appeared from nowhere and you clicked to open it out of curiousity, the virus spread more again. Moreover, the virus disabled the registry edit where you will see this message “Registry edit is disabled by the administrator” everytime you try to edit the registry.

So how to clean the virus then? I found some solution from Symantec.

W32.Rontokbro@mm aka brontok.a

This article is based upon what’s written on Symantec Security Response. The original article can be found here
Read the original page to know much into the technical details. I’ll just extract the information on how to remove it, since u already know what it does and what name it carries.

Removal Instructions.

The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

1. Disable System Restore (Windows Me/XP)
2. Disable network folder sharing on any folder.
3. Update the virus definitions. Install one if you never had any. Norton and AVG already tested to be working. NOD32 might results to failure if the infections happen for the second time.
4. Boot the pc into safe-mode.
5. Run a full system scan and delete all the files detected. You may want to repeat this step a few times if there’s any file that failed to be removed.
6. After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

7. Use the Security Response “Tool to reset shell\open\command registry subkeys.”

Link here.
1. To delete the value from the registry
Click Start > Run.

Type regedit

Click OK.

Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.

Navigate to the subkey:


In the right pane, delete the value:

“Bron-Spizaetus” = “C:\WINDOWS\PIF\CVT.exe”

Exit the Registry Editor.

To delete the scheduled tasks added by the worm

Click Start, and then click Control Panel. (In Windows XP, switch to Classic View.)
In the Control Panel window, double click Scheduled Tasks.
Right click the task icon and select Properties from pop-up menu.
The properties of the task is displayed.
Delete the task if the contents of the Run text box in the task pane, matches the following:


Or just delete anything that you don’t recognize or remember that you created. Just delete anything suspicious.

Ok now you are almost done. (The steps below are not covered by Symantec.)

Open your folder options (Start > Control Panel > Folder Options). If you failed to do so, follow this step:

Run you regedit.exe again and browse to this code:



Data Type: DWORD = 00000001

Change the DWORD value to 00000000. You may need to restart your computer after that.

Now in the Folder Options, go to “View” tab, untick the option Hide extensions for known file types

Now browse carefully into you documents folder, since most of the time the worm will resides there. Try looking into you pictures folder (eg: My Pictures). If there’s a file that looks like a folder but ends something with .exe, delete it. Most of the time the name will be the duplication of the folder itself. (eg: D:\Documents\My Pictures\personal\personal.exe). The icon will be folder icon so be careful. If you happen to double click it, you will need to remove the virus again.

Check all folders in each drive just to make sure you are clean from it.

Sounds complicated right? I’ve uninstalled my ZoneAlarm Security Suite and installed AVG antivirus. Why I uninstalled it? ZA is almost useless in detecting worms where I found more than 20 files infected by scanning using AVG while ZA can’t find anything at all~! After cleaning, I installed another program, Ewido Anti-Malware, to check there’s any worm or spyware still available. This program is really good as it can detect spywares, worms, trojans, and even keyloggers. I found 160+ files infected after scanning the whole system in Safe Mode. Mostly are just trackers which is not really harmful.

The final steps I did are just following the steps above. In the end, I managed to enable the registry edit and also my folder options again. Now my pc is finally clean from the Brontoks~ I’ve killed you Brontoks!! Yippie!

Update 14 January 2007:
I found some alternative way to delete the virus. Not tested but it is being distributed by popular antivirus programs. Try using the removal tools from Bitdefender and Kaspersky

Download the tools and scan your computer with it. It will remove all the files infected with the Brontok virus. Good luck!~

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An engineer which have a lot of interests in gadgets and technology stuffs. The blog varies from life events to gadgets reviews and hacks.


  • nicholas

    Erm…I got install bitdefender antivirus plus v10.. what the diferences? i scan it but after i scan it ..the software like Digi Scale still cannot work ?? so how ?

  • nicholas

    some of this virus cannot moved by this antivirus .. the virus detected is Generic.Brontok.B0015626 and WIN32.Brontok.C@MM … two of my computer has damage … the mother board already infected by the virus … it show checksum error.. and another one is cannot detect keyboard … i hope this wont happend to other computer… thanks if you can solve it for me …

  • menghua

    Sorry, I dun think I can help much on this. Either is you format your pc and reinstall everything. But I don’t think the virus will somehow infect the motherboards. it maybe affected by some hardware failures for the undetectable keyboard. Good luck..

  • Tamers

    This is the tools/solutions for that to remove the brontok virus.

    1. smitfraudfix
    4. Hijackthis

    Run the tools in order and you will done. When running hijackthis remove the entries that brontok resides and other suspicios entries from your registry. It can also open diasbled registry so registry fixing is no problem.

    Online is the best solution for removing virus from your computer. If you don’t t\have tools like smitfraudfix or hijackthis then searhc through google. Those are free softwares.

    Goodluck and have fun repairing ! 😀

  • nicholas

    Omg!! I think I dont want to format all of it… need to work till morning… my work place close at 10pm … never mind its not my prob any more …the panda software cannot install coz the avg stop it from install … but thanks for the help…

  • Virus affected me badly

    dear friend,
    i have more works to do in my computer but the virus has already killed me half.please help to find my missing folder options

  • pohpeht

    OMG! is there any way that i can remove all of this brontok thing? im handling 400+ units here! gosh this is not a simple job as others saying! i guess it will take me 10 years to finish cleaning this stuff! hehehehhe! anyways, thanks for the tips! ill find another way to crack this rontokbro! bye!

    godbless to all…..

  • Paul


    Thank you for the info sharing. I’ve read about this from other people’s review & a lot of people give face the same problems about the brontox virus. Its very annoying & personally i have used the same method you suggested – using Bitdefender brontok remover. It works really well !

    Thank you

  • bagonb

    brontok to manage my pc..folder oftion missing and search button cannot use.folder option i can solve..but search button disable i don’t to solve???

  • sunshine

    help. i’m scared to do complicated stuff with my pc. my pc is not connected to the internet to protect it from viruses because i use it for video editing. but the brontok found its way into my system when i connected a friend’s camera to my ccomputer.

    my avg was not updated when it got affected, but i was still able to update it after and so detected the virus. but when i emptied my virus vault, i couldn’t find all the important files anymore in my hard drives (which i assume were infected by the virus).

    what do i do? how do i find my files/folders?

    desperately need help. my files are important for my work and i have a deadline right now.:((

  • mohit

    if you want to recover your files then log on to google and search for file recovery software with crack and after a bit of searching you can find one. run that software you will find most of your files.

  • Dee

    Does anyone know whether Brontok.A can affect a phone ?
    Accidently transferred files from my infected computer into a memory stick yet I’m kinda freaked out whether to place it back into my phone or not ?

  • marcus

    kudos to the above post have really learn t something new about this virus called brontok. hope to know more about this virus. thanks

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