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Malware Defense History

by Dr. Nikolai Bezroukov.

Copyright: Dr. Nikolai Bezroukov 1994-2013. Unpublished notes. Version 0.80.October, 2013

Contents : Foreword : Ch01 : Ch02 : Ch03  : Ch04 : Ch05 : Ch06 : Ch07 : Ch08 : Ch09 : Ch10 : Ch11 : Ch12 : Ch13

Chapter 9: Scareware -- fake antivirus programs, data recovery utilities and like

Dr Guard


Recommended Links Spyware Spyware fighting strategy XP Antivirus 2012 Dr Guard

[Feb 28, 2010] Remove Dr. Guard (Uninstall Guide)

Another Rogue Antivirus that uses internal proxy of port 5555 to control internet access. Install a couple of drivers (names vary, you need to compare with baseline to detect (actually names are random and can be detected as such). Put initial "bootstrap" executable into %UserProfile%\Application Data subfolder with a random name. Windows Defender actually registers the moment of infection but does not prevent it with default settings. Probably contain root kit or shell-hooks or something of this nature as computer stops responding and sometimes crashes often even after the deletion of those three components (I have found two drivers in system32/drivers folder and executable in %UserProfile%\Application Data folder that is referenced in one of the keys in CurrentVersion/Run). Check using See Remove Dr. Guard (Uninstall Guide). Again the main lesson is to have an image of C-drive and remember what data to copy from the current drive to bootable USB drive (you need to put the drive into USB enclose and boot from USB drive is image first) to the restored image. Disinfection involved too much troubles: it is not an easy task to try to outsmart those extortionists...

What this programs does:

Dr. Guard is a rogue anti-spyware program from the same family as Paladin Antivirus. This rogue is promoted and installed through the use of fake alert Trojans that advertise the program on your desktop. This rogue is also known to be bundled with the TDSS, or TDL3, rootkit. As MBAM is not capable of removing this rootkit, you may need to request further assistance in our Virus, Trojan, Spyware, and Malware Removal Logs forum to remove all of the malware on your computer.

Once downloaded and installed, Dr. Guard will attempt to uninstall various security applications in order to protect itself from being removed. The anti-malware programs that it tries to uninstall include:

The program will then load and start to scan your computer for infections. Once the scan is finished it will state that there are numerous infections on your computer, but will not allow you to remove them until you purchase the program. In reality, the infections that it shows are all fake and do not actually exist on your computer. Therefore, please do not purchase this program based upon any of the scan results it shows.

Dr. Guard screen shot
For more screen shots of this infection click on the image above.
There are a total of 8 images you can view.

Dr. Guard also employs numerous methods where it tries to trick you into thinking you are infected. The first method is the display of a Window that impersonates the legitimate Windows Security Center. The difference is that this fake version suggests you purchase Dr. Guard to protect yourself. While the program is running you will also see a constant display of fake security alerts and warnings appear on your desktop and Windows taskbar. These alerts contain dire messages stating that your computer is under attack, all of your data is being deleted, or that personal information is being sent to a remote location. Some examples of the alerts you may see include:



Windows Firewall has detected unauthorized activity, but unfortunately it cannot help
you to remove viruses, keyloggers and other spyware threats that steal your personal
information from your computer

System files of your computer are damaged. Please, restart your system ASAP.
There are some serious security threats detected on your computer. Please, remove them ASAP.

There are some serious security threats detected on your computer: viruses, trojans, keyloggers, exploits etc.
Your computer and all your personal data are in serious danger.
Protection: Click the balloon to install antivirus software.

Defenseless OS: Windows 2000/XP/Vista
Description: Spyware. Blocks access to computer. Attacks porn sites visitors.
Protection: Click the balloon to install antivirus software.

Just like the fake scan results, these fake alerts are just another tactic where Dr. Guard is trying to convince you that you have a security problem on your computer.

As you can see, Dr. Guard was created to trick you into thinking you are infected so that you will then purchase the program. It goes without saying that you should definitely not purchase this program, and if you already have, please contact your credit card company to dispute the charges. To remove this infection and any related malware, please use the removal guide below.

Threat Classification:

Advanced information:

View Dr. Guard files.
View Dr. Guard Registry Information.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Dr. Guard
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System "DisableTaskMgr"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "Dr. Guard"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved "{5E2121EE-0300-11D4-8D3B-444553540000}"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System "DisableTaskMgr" = "1"

Entries for this program found in the Add or Remove Programs control panel:

Dr. Guard

Tools Needed for this fix:

Symptoms that may be in a HijackThis Log:

O4 - HKCU\..\Run: [asr64_ldm.exe] %Temp%\asr64_ldm.exe
O4 - HKCU\..\Run: [Dr. Guard] "C:\Program Files\Dr. Guard\drguard.exe" -noscan

Guide Updates:

02/19/10 - Initial guide creation.


The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D

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Last modified: March 12, 2019