System Diagnostic

Also Known As: SystemDiagnostic
Distribution: Low
Damage level: High

System Diagnostic removal guide

What is System Diagnostic?

System Diagnostic is a rogue system optimizer that attempts to scare computer users into believing that their computer's hardware has malfunctioned. Creators of such malware often change the name and skin of their rogue programs in order to further convince users of its validity. This spyware is distributed via Trojans, and when it infects your PC, it will display various pop-ups reporting that there is a problem with the hardware. For example, the program might report that your hard drive has multiple errors, and to fix them, you are required to purchase a full version of System Diagnostic.

System Diagnostic rogue program

Do not buy this program, it is a scam and designed only to scare people into purchasing a fake license. If you buy this program you will lose your money and your computer will remain infected. You should not enter your banking information using this program. If you have already purchased this fake program, you should contact your credit card company and dispute the charges, explaining that you have been tricked into purchasing a fake computer optimizer.

Ensure that you carry out some research before buying computer security programs. System Diagnostic capable of blocking your desktop and legitimate Windows programs from running. It will flood your desktop with fake warning messages. Ignore these messages, as there is nothing wrong with your computer, other than infection by System Diagnostic malware. This program is categorized as scare-ware and distributed by Internet criminals in the hope that you will believe the fake warning messages and purchase System Diagnostic to fix your 'hardware errors'. In fact, there is nothing wrong with your computer's hard disk drive; System Diagnostic is designed to make you believe there is a problem so that you purchase a useless license key. You should not believe any of the information or messages delivered by this program - it is a fake computer optimizer and should be eliminated from your PC.

The following security warning messages will be displayed:

"Requested registry access is not allowed. Registry defragmentation required. Read time of hard drive clusters less than 500 ms. 32% of HDD space is unreadable. Bad sectors on hard drive or damaged file allocation table. CPU RAM temperature is critically high. Urgent RAM memory optimization is required to prevent system crash. Drive C initializing error. Ram Temperature is 83 C. Optimization is required for normal operation. Hard drive does not respond to system commands. Data Safety Problem. System integrity is at risk. Registry Error - Critical Error."

"Critical Error! Damaged hard drive clusters detected. Private data is at risk."

"Critical Error Hard Drive not found. Missing hard drive."
"Critical Error RAM memory usage is critically high. RAM memory failure."
"Critical Error Windows can't find hard disk space. Hard drive error."

"Critical Error! Windows was unable to save all the data for the file \System32\496A8300. The data has been lost. This error may be caused by a failure of your computer hardware."

"Critical Error A critical error has occurred while indexing data stored on hard drive. System restart required."

"System Restore The system has been restored after a critical error. Data integrity and hard drive integrity verification required."

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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Quick menu:

System Diagnostic removal guide

1. Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer starting process press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, then select Safe Mode with Networking from the list.{jcomments on}

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2. Open Internet Explorer, click Tools and select Internet Options. Select Connections, then click LAN settings, if 'Use a proxy server for your LAN' is checked, uncheck it and press OK.

3.  Download HijackThis and save it to your desktop. Some malicious programs are able to block HijackThis, so when you click the download link, in the Save dialog, rename HijackThis.exe to iexplore.exe and only then click the Save button. After saving the file to your desktop, double click it. In the main HijackThis window click the “Do a system scan only” button. Select the following entry (place a tick at the left of the entry):

Windows XP:
O4 - HKCU\..\Run: [.exe] %AllUsersProfile%\Application Data\.exe
O4 - HKCU\..\Run: [] %AllUsersProfile%\AppData\.exe

Windows Vista and Windows 7:
O4 - HKCU\..\Run: [.exe] %AllUsersProfile%\.exe
O4 - HKCU\..\Run: [] %AllUsersProfile%\.exe
 

After selecting the required entry, click "Fix Checked". After this procedure you can close HijackThis and proceed to the next removal step.

4. Download and install anti-spyware software to completely remove the infection.

Other tools known to remove System Diagnostic Protector:

If you are unable to remove System Diagnostic, you can use these manual removal instructions. Use them at your own risk, since if you do not have strong computer knowledge, you could harm your operating system. Use them only if you are an experienced computer user. (Instructions on how to end processes, remove registry entries...)

 

End these System Diagnostic processes:

[random]

Remove these System Diagnostic registry entries:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "[random].exe"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "[random]"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations "LowRiskFileTypes" = '/{hq:/s`s:/ogn:/uyu:/dyd:/c`u:/bnl:/ble:/sdf:/lrh:/iul:/iulm:/fhg:/clq:/kqf:/`wh:/lqf:/lqdf:/lnw:/lq2:/l2t:/v`w:/rbs:'
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments "SaveZoneInformation" = '1'
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download "CheckExeSignatures" = 'no'
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Use FormSuggest" = 'yes'
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings "WarnonBadCertRecving" = '0'
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System "DisableTaskMgr" = '1'

Delete these System Diagnostic files:

%AllUsersProfile%\Application Data\~[random]
%AllUsersProfile%\Application Data\~[random]
%AllUsersProfile%\Application Data\[random].dll
%AllUsersProfile%\Application Data\[random].exe
%AllUsersProfile%\Application Data\[random]
%AllUsersProfile%\Application Data\[random].exe

Summary:

The fake antivirus programs (also known as "rogue antivirus programs" or "scareware") are applications that tries to lure computer users into paying for their non-existent full versions to remove the supposedly detected security infections (although the computer is actually clean). These bogus programs are created by cyber criminals who design them to look as legitimate antivirus software. Most commonly rogue antivirus programs infiltrate user's computer using poop-up windows or alerts which appear when users surf the Internet. These deceptive messages trick users into downloading a rogue antivirus program on their computers. Other known tactics used to spread scareware include exploit kits, infected email messages, online ad networks, drive-by downloads, or even direct calls to user's offering free support.

A computer that is infected with a fake antivirus program might also have other malware installed on it as rogue antivirus programs often are bundled with Trojans and exploit kits. Noteworthy that additional malware that infiltrates user's operating system remains on victim's computer regardless of whether a payment for a non-existent full version of a fake antivirus program is made. Here are some examples of fake security warning messages that are used in fake antivirus distribution:

Fake pop-up used in rogue antivirus distribution example 1

Fake pop-up used in rogue antivirus distribution example 2

Computer users who are dealing with a rogue security software shouldn't buy it's full version. By paying for a license key of a fake antivirus program users would send their money and banking information to cyber criminals. Users who have already entered their credit card number (or other sensitive information) when asked by such bogus software should inform their credit card company that they have been tricked into buying a rogue security software. Screenshot of a web page used to lure computer users into paying for a non-existent full version of systemdiagnostic and other rogue antivirus programs:

example of a webpage used to collect payments for fake antivirus programs

To protect your computer from systemdiagnostic and other rogue antivirus programs users should:

  • Keep their operating system and all of the installed programs up-to-date.
  • Use legitimate antivirus and anti-spyware programs.
  • Use caution when clicking on links in social networking websites and email messages.
  • Don't trust online pop-up messages which state that your computer is infected and offers you to download security software.

Symptoms indicating that your operating system is infected with a fake antivirus program:

  • Intrusive security warning pop-up messages.
  • Alerts asking to upgrade to a paid version of a program to remove the supposedly detected malware.
  • Slow computer performance.
  • Disabled Windows updates.
  • Blocked Task Manager.
  • Blocked Internet browsers or inability to visit legitimate antivirus vendor websites.

If you are experiencing problems while trying to remove systemdiagnostic from your computer, please ask for assistance in our malware removal forum.

If you have additional information on systemdiagnostic or it's removal please share your knowledge in the comments section below.

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
SystemDiagnostic QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of SystemDiagnostic on your mobile device.
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