How to Remove Antivirus .NET [Removal Guide]


Thread author
Staff Member
Jan 24, 2011
What is Antivirus .NET?

Antivirus .NET is a fake system software that is considered as a Rogue. Rogues are malicious programs that hackers use to trick users by displaying false threats and problems that it claims to have detected. In reality, none of the issues are real and are only used to convince the user into buying their software and stealing their personal financial information

Am I infected?

These is a screenshot of this rogue.


Removal Instructions
(If you experience any problems completing these instructions, please start a new thread here)

1. This rogue adds a proxy server which prevents the user from accessing the internet. To remove this proxy server, start Internet Explorer. Under Tools, select Internet Options.


Select the Connections tab. Then click on LAN Settings.


Un-check the boxes under Proxy server if they are checked. This will remove the proxy server and allow you to use the internet again.


For Firefox users, go to Tools > Options > Advanced tab > Network > Settings > Select No Proxy

2. Restart your computer. As soon as your computer turns on, tap F8 until you reach the Advanced Boot Options. Use the arrow keys and select Safe Mode with Networking .

3. Download and run RKill.

Download mirror 1 - Download mirror 2 - Download mirror 3

  • Save it to your Desktop.
  • Double click the RKill desktop icon.
  • It will quickly run and launch a log. If it does not launch a log, try another download link until it does.
(Do not reboot your computer after running RKill as the malware programs will start again.
This tools will kill the rogue's process temporarily. As a result, act quickly and move on to the next step.)

4. Download Malwarebytes' Anti-Malware to your desktop.

  • Rename the file to firefox.exe BEFORE downloading
  • Double-click firefox.exe and follow the prompts to install the program.
  • At the end, be sure a checkmark is placed next to
    • Update Malwarebytes' Anti-Malware
    • and Launch Malwarebytes' Anti-Malware
  • then click Finish.
  • If an update is found, it will download and install the latest version.


  • Once the program has loaded, select Perform full scan, then click Scan.
  • When the scan is complete, click OK, then Show Results to view the results.


  • Be sure that everything is Checked (ticked) and click on Remove Selected.
  • Reboot your computer if prompted.

Malwarebytes should completely remove this infection however you can also download other free anti-malware softwares from the list below and run a full system scan to make sure that your computer is clean.

If you are still experiencing problems on your machine, please start a new thread here.

How was I infected?

  • Rogues can get on to computers without the user's consent through Drive-by downloads. When a user visits a compromised or infected website, the site immediately checks for any security vulnerabilities on the machine to inject the malicious code.
  • Peer-to-peer (P2P) programs utorrent, Limewire, and Kazaa are frequently used by hackers to distribute malware
  • Hackers can also trick the user into downloading a file, saying it is a legitimate file needed to view a video or pictures.

How can I prevent these infections?

1. Keep Your System Updated
  • Microsoft releases patches for Windows and Office products regularly to patch up Windows and Office product bugs and vulnerabilities. Please ensure you update your system regularly.

    To update Windows and Office

    1. Go to Start > Control Panel > Automatic Updates
    2. Select Automatic (recommended) if you want the updates to be downloaded and installed without prompting you.
    3. Select Download updates for me, but let me choose when to install them button if you want the updates to be downloaded automatically but to be installed at another time.

To manually update Windows,

  • Start Internet Explorer. Go to Tools > Windows Update

2. Keep your Antivirus up-to-date

Make sure that you update your antivirus, firewall and anti-spyware programs regularly. If you don't have an antivirus, download any one of the following:

3. Avoid Peer-to-peer programs
  • Peer-to-peer programs are legitimate but the files shared are extremely dangerous. Hackers often use fake file names to trick users into downloading malware.

4. Switch your browser
  • Firefox is a more secure, faster browser than Internet Explorer. Firefox contains less vulnerabilities, reducing the risk of drive-by downloads.
  • Google Chrome is another good browser that is faster and more secure than Internet Explorer.

5. Read our other "Security Tips"

Tehnical details :
Associated files and registry values:

In Windows XP:
C:\Documents and Settings\[UserName]\Local Settings\Application Data\[random]\[random]sysguard.exe
C:\Documents and Settings\[UserName]\Local Settings\Application Data\[random]\[random].exe
C:\Documents and Settings\[UserName]\Local Settings\Application Data\[random]\[random]sftav.exe
In Windows Vista & 7:
By default "Appdata" folder is hidden. To unhide this folder (and others), open the Folder Options in the Vista Control Panel, and on the “View” tab, change the option to “show hidden files and folders”, and click ok.

Registry values:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run ""
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "" 
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments "SaveZoneInformation" = "1"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings "ProxyServer" = "http="
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations "LowRiskFileTypes" = ".exe"
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download "RunInvalidSignatures" = "1"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings "ProxyOverride" = ""

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