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Hijacked DNS


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#1 anonymouse

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Posted 18 November 2009 - 11:17 PM

Okay, I've been having several problems with the redirect virus lately. I ran Malwarebytes on the infected computer and it came up with several infections, but when I quarantined them and rebooted, my internet stopped working altogether. I decided to try a little experiment by restoring the quarantined items one at a time to see which one would turn my internet back on, and it happened to be a Trojan that came up as:

Trojan.DNS-changer (Hi-jacked DNS)

in the quarantine queue. There was also a rootkit and some adware, but I had no problem getting rid of those. The only thing wrong now is that if I get rid of the hijack trojan it shuts off my internet.

Could anybody help me please? I've been attempting to deal with this for several days now and nothing seems to work. Thanks.

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#2 boopme

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Posted 18 November 2009 - 11:37 PM

Hello anonymouse
Now we will work on the DNS changer,,,,
Next you must reset the router to its default configuration. This can be done by inserting something tiny like a paper clip end or pencil tip into a small hole labeled "reset" located on the back of the router. Press and hold down the small button inside until the lights on the front of the router blink off and then on again (usually about 10 seconds). If you donít know the router's default password, you can look it up HERE.

However, if there are other Zlob-infected machines using the same router, they will need to be cleared by runnong Malwarebytes on them before resetting the router. Otherwise, the malware will simply go back and change the router's DNS settings. You also need to reconfigure any security settings you had in place prior to the reset. Check out this site HERE for video tutorials on how to properly configure your router's encryption and security settings. You may also need to consult with your Internet service provider to find out which DNS servers your network should be using.

Once you have ran Malwarebytes' Anti-Malware on the infected system, and reset the router to its default configuration you can reconnect to the internet, and router.
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#3 anonymouse

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Posted 18 November 2009 - 11:47 PM

Thanks for your quick response.

Just to make sure I'm getting this right before I try it: I should run Malwarebytes again and remove the Zlob trojan BEFORE resetting my router?

#4 boopme

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Posted 18 November 2009 - 11:56 PM

Yes run again. Im logging off now but I'll look in tomorrow.. Even if you do not see Zlob in the results proceed,
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#5 anonymouse

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Posted 19 November 2009 - 05:07 PM

Hey Boopme, thanks for your help. I quarantined and removed the trojan, reset my router, and was successfully able to reconnect to the internet after rebooting.

#6 boopme

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Posted 19 November 2009 - 08:05 PM

You're welcome... Now 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 Start > 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 Start > 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 Users can refer to these links: Create a New Restore Point and Disk Cleanup.
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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