W32.Avendog

W32.Avendog is a worm that propagates by creating a copy of itself to removable and USB drives. It will create a backdoor on infected computer that allows a remote attacker to obtain unauthorized access. W32.Avendog can also inject malicious code on to “Explorer.exe” so that the malicious process loads automatically.

Alias: Malware.Avendog (PCTools), Trojan.Win32.Buzus.eoyp

Damage Level: Low

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

Characteristics
When W32.Avendog is executed, it will copy itself under System directory of Windows. The worm then embeds own malicious code to “explorer.exe” to start own process. Additional start-up option is to add an entry on Windows registry that automatically loads the Worm on system boot-up.
This worm may also reduce security settings on the infected computer by altering various relevant registry entries.

W32.Avendog will disable Safe Mode function to prevent removal by deleting the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\SafeBoot\Minimal
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\SafeBoot\Network

Once all modifications are accomplished on the compromised system, W32.Avendog will perform the following tasks:

  • Connect to a remote server to upgrade itself
  • Communicate to a predefined Internet Relay Chat (IRC) server and opens a backdoor that allows a remote attacker to manipulate the computer
  • Send messages containing malicious links using Instant Messenger applications found on affected PC
  • Modify Windows Hosts file to pass-on requested web page to a different web address

Distribution
This worm may arrive on a computer as an attached file to spam email messages. Instant messaging application is another channel to propagate the worm using victim’s account while sending malicious link to friends lists.

W32.Avendog may spread through removable drives by dropping the following files:
%DriveLetter%\~data\658769.exe
%DriveLetter%\autorun.inf

How to Remove W32.Avendog

Systematic procedures to get rid of the threat are presented on this section. Make sure to scan the computer with suggested tools and scanners.

NOTE: We suggest that you PRINT or BOOKMARK this guide. There are steps that we may have to restart the computer in order to successfully remove the threat.

Step 1 : Run a scan with your antivirus program

1. Remove all media such as Memory Card, cd, dvd, and USB devices. Then, restart the computer and please do the following:

Boot in Safe Mode on Windows XP, Windows Vista, and Windows 7 system
a) Before Windows begins to load, press F8 on your keyboard.
b) It will display the Advanced Boot Options menu. Select Safe Mode.

Start computer in Safe Mode using Windows 8 and Windows 10
a) Close any running programs on your computer.
b) Get ready to Start Windows. On your keyboard, Press and Hold Shift key and then, click on Restart button.
c) It will prompt you with options, please click on Troubleshoot icon.
d) Under Troubleshoot window, select Advanced Options.
e) On next window, click on Startup Settings icon.
f) Lastly, click on Restart button on subsequent window.
g) When Windows restarts, present startup options with numbers 1 - 9. Select "Enable Safe Mode with Networking" or number 5.

Startup Options

h) Windows will now boot on Safe Mode with Networking. Proceed with virus scan as the next step.

2. Once Windows is running under Safe Mode with Networking, open your antivirus program and download the most recent update. This method ensures that your antivirus program can detect even newer variants of W32.Avendog.

Updating your antivirus software is a one-click process. Please refer to your software manual for complete instructions.

3. Once updating is finished, run a full system scan on the affected PC. After the scan, delete all infected items. If unable to clean or delete, better place the threat in quarantine.

Step 2: Run another test with online virus scanner

Another way to remove W32.Avendog without the need to install additional antivirus software is to perform a thorough scan with free online virus scanner. It can be found on websites of legitimate antivirus and security provider.

1. Click the button below to proceed to the list of suggested Online Virus Scanner. Choose your desired provider. You can run each scan individually, one at a time, to ensure that all threats will be removed from the computer. This may require plug-ins, add-on or Activex object, please install if you want to proceed with scan.

Online Virus Scan

2. After completing the necessary download, your system is now ready to scan and remove W32.Avendog and other kinds of threats.
3. Select an option in which you can thoroughly scan the computer to make sure that it will find and delete entirely all infections not detected on previous scan.
4. Remove or delete all detected items.
5. When scanning is finished, you may now restart the computer in normal mode.

Alternative Removal Procedures for W32.Avendog

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

During an infection, W32.Avendog drops various files and registry entries. The threat intentionally hides system files by setting options in the registry. With these rigid changes, the best solution is to return Windows to previous working state is through System Restore.

To verify if System Restore is active on your computer, please follow the instructions below to access this feature.

Access System Restore on Windows XP, Windows Vista, and Windows 7

a) Go to Start Menu, then under 'Run' or 'Search Program and Files' field, type rstrui.
b) Then, press Enter on the keyboard to open System Restore Settings.

rstrui-win7

Open System Restore on Windows 8 and Windows 10

a) Hover your mouse cursor to the lower left corner of the screen and wait for the Start icon to appear.
b) Right-click on the icon and select Run from the list. This will open a Run dialog box.
c) Type rstrui on the 'Open' field and click on OK to initiate the command.

rstrui-win8

If previous restore point is saved, you may proceed with Windows System Restore. Click here to see the full procedure.

Option 2 : W32.Avendog manual uninstall guide

IMPORTANT! Manual removal of W32.Avendog 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 W32.Avendog.

- Press Ctrl+Alt+Del on your keyboard.
- When Windows Task Manager appears, look for W32.Avendog 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 the following:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "[random charaters.exe]"
- 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 using the procedures above.
- Open your anti-virus program and thoroughly run a scan on the computer. Delete/Quarantine all identified threats to remove W32.Avendog effectively.

4. Delete all files dropped by W32.Avendog.

- 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.

FAQs

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Associated Files and Folders:Added Registry Entries:
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About Marco Mathew

Marco Mathew works as Windows Network administrator before establishing precisesecurity.com. Now, Marco is dedicating full-time to help computer users' fight viruses, malware, trojan, worms, adware, and potentially unwanted programs.

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