Virus Komputer (seri-14)

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Mengatasi Virus Conficker, Downadup.C
Belajar komputer, belajar internet, belajar blog. Pada artikel sebelumnya yaitu top 10 virus paling beken pada bulan Juni 2009 kita bersama-sama telah melihat bahwa yang menduduki peringkat pertama adalah Virus Conficker. Itu artinya virus ini menyebar cukup luas dan ganas. Nah pada artikel kali ini kita akan membahas bagaimana mengatasi virus ini. Dalam pembahasan ini kita akan menggunakan produk antivirus buatan symantec yang sudah lumayan terkenal. Nama softwarenya W32.Downadup Removal Tool. Versi inggris cara penanganannya sudah ada disini;, Langkah-langkah penanganannya akan saya copy-kan secara langsung;

The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines. For specific details on each of these steps, read the following instructions.

  1. To disable System Restore (Windows Me/XP)

If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Note: When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.

2. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:

Running LiveUpdate, which is the easiest way to obtain virus definitions.

If you use Norton AntiVirus 2006, Symantec AntiVirus Corporate Edition 10.0, or newer products, LiveUpdate definitions are updated daily. These products include newer technology.

Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them.

Note: W32.Downadup.C may block access to Symantec Web sites and network addresses, which may result in failure to obtain the most recent virus definitions. Follow these steps to remove the block:

  • Click Start > Run or hit Windows Key + R.
  • Type cmd, and then click OK.
  • Type net stop dnscache and press Enter.
  • Type exit and press Enter.

3. To find and stop the service

  1. Click Start > Run.
  2. Type services.msc, and then click OK.
  3. Locate and select the service that was detected.
  4. Click Action > Properties.
  5. Click Stop.
  6. Change Startup Type to Manual.
  7. Click OK and close the Services window.
  8. Restart the computer.

4. To run a full system scan

Run a full system scan. If any files are detected, follow the instructions displayed by your antivirus program. If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode. Once you have restarted in Safe mode, run the scan again. 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.

5. To delete the value from the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified subkeys only. For instructions refer to the document: How to make a backup of the Windows 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 and delete the following registry subkeys:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\[CLSID 1]
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\[CLSID 1]

Navigate to and delete the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\”[RANDOM CHARACTERS]” = “rundll32.exe “[RANDOM DLL FILE NAME]”, [RANDOM PARAMETER STRING]”
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\[RANDOM CHARACTERS]\”ImagePath” = “%System%\svchost.exe -k netsvcs”
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\[RANDOM CHARACTERS]\Parameters\”ServiceDll” = “[PATH TO THE THREAT]”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\[CLSID 2]\”[WORD 1][WORD 2]” = “[BINARY DATA]”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\[CLSID 2]\”[WORD 1][WORD 2]” = “[BINARY DATA]”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\[CLSID 2]\”[WORD 1][WORD 2]” = “[BINARY DATA]”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\[CLSID 2]\”[WORD 1][WORD 2]” = “[BINARY DATA]”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\[CLSID 2]\”[WORD 1][WORD 2]” = “[BINARY DATA]”
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\[CLSID 2]\”[WORD 1][WORD 2]” = “[BINARY DATA]”

Restore the following registry entries to their previous values, if required:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\”Windows Defender”

Exit the Registry Editor.

Note: If the risk creates or modifies registry subkeys or entries under HKEY_CURRENT_USER, it is possible that it created them for every user on the compromised computer. To ensure that all registry subkeys or entries are removed or restored, log on using each user account and check for any HKEY_CURRENT_USER items listed above.

Writeup By: Ka Chun Leung and Sean Kiernan

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