Yontoo

Yontoo is a program that can be added on to the system with users consent. However, actual behavior of this software remains unknown to user until it is installed and running on PC. The adware can install add-ons on Internet browser to exhibit advertisements once victim is log-on and using Facebook.

When user executes Yontoo, it will create a number of files under Temporary folder of Windows. It will also tweak the settings through registry modifications. After changing the registry, this adware will be able to install add-ons to Internet browsers and modifies the look of victim’s Facebook account. This app that can dress-up Facebook profile is called PageRage. Additionally, Yontoo will display advertisements coming from its own server and pretend to be part of the social networking sites.

Yontoo is not a virus. Unknown to many users who got this adware, it is their sole action why the program manages to install inside the computer. The adware may come bundled with other free software that you can download from third-party web sites. Some popular programs known to be linked with Yontoo are FLV player, MP3 player, Video converter and other similar software that are multimedia related.

Once installed, the program will not infect files inside the computer. Lone payload of this program is to install an add-on and exhibit advertisements. There are no reports that Yontoo can perform severe damages once it is installed.

Screenshot Image:

Damage Level: Very Low

Systems Affected: Windows 9x, 2000, XP, Windows Vista

How to Remove Yontoo

1. Temporarily Disable System Restore (Windows Me/XP). [how to]
2. To be able to identify even the most recent variant of Yontoo, open your antivirus application and update the virus definition file.

3. Start Windows in Safe Mode with Networking.
- From a power-off state, turn on the computer and press F8 on your keyboard repeatedly.
- Your computer will display Windows Advanced Boot Options menu. Please select Safe Mode with Networking.
- The system will boot Windows loading only necessary drivers and files.

4. Open your antivirus program and run a full system scan. After the scan, delete all infected items. If unable to delete, better place them in quarantine. Once the scan is complete, please proceed with the next step.

Scan with Norton Power Eraser:

Additional virus removal tool provides deep scanning technology to eliminate other threats not detected by a normal virus scan. Use this tool with extra caution.

5. Go to NPE web page and download the tool.
6. Once the download completes, double click on the file NPE.exe to run the program.
7. It will prompt for End User License Agreement, click on Accept to continue.
8. On NPE main window, click on Scan. Then select Exclude Rootkit Scan. Click on Continue to proceed.
9. Virus scanning may take some time. After running the scan, NPE will display the scan result.

Important! If there are any detected threats under Suspicious, remove the check mark. Only threats in Detected category are necessary to remove at this point. Make sure that you mark the Create System Restore Point before proceeding with the fix.

10. Now click on Fix to start removing the threats including Yontoo remnants if there are any.
11. When done, Norton Power Eraser will restart the computer. Then after a reboot, it will initialize and display the eliminated threats.
12. You may now close Norton Power Eraser.

Alternative Removal Method for Yontoo

Option 1 : Use Windows System Restore to return Windows to previous state

If Yontoo enters the computer, there is a big chance that Windows files, registry entries and other essential components are also infected. System Restore can reinstate clean system files by restoring the configuration to an earlier date. The method also replaces compromised files with a clean version. If you have a saved restore point before Yontoo infiltrates the PC, we highly encourage you to execute this procedure if none of the above works. You may proceed with Windows System Restore, click here to see the full procedure.

Option 2 : Yontoo manual uninstall guide

IMPORTANT! Manual removal of Yontoo requires technical skills. Deleting system files and registry entries by mistake may result to total disability of Windows system. We advise you to perform a backup of registry before proceeding with this guide.

1. Kill any running process that belongs to Yontoo.
- Press Ctrl+Alt+Del on your keyboard.
- When Windows Task Manager appears, look for Yontoo files (refer to Technical Reference) and click End Process.

End Task

2. Delete all registry entries that belong to this malware.
- Press [Windows Key]+R on your keyboard.
- In the 'Open' dialog box, type regedit and press Enter. This will open registry editor.
- Find and delete registry entries as mentioned in Technical Reference section below.
- Close registry editor. Changes made will be save automatically.

Run Regedit

3. Scan the computer with antivirus program.
- Connect to Internet and open your antivirus software. Please update to obtain the latest database and necessary files.
- Restart the computer in Safe Mode.
- Just before Windows logo begins to load press F8 on your keyboard.
- On Windows Advanced Boot Options, select Safe Mode and press Enter.

4. Delete all files dropped by Yontoo.
- While still in Safe Mode, search and delete malicious files. Please refer to 'Technical Reference'. Make sure that you execute 'End Task' first before deleting the file. Otherwise, the system will not let you perform this action.

Technical Reference

Associated Files and Folders:Added Registry Entries: