Threat description




Dishonest antivirus software which tricks users into buying or installing it, usually by infecting a user's computer, or by pretending the computer is infected.


Automatic action

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Technical Details

Rogue:W32/Sysguard is distributed by Trojan-Downloader:W32/FraudLoad.HK. While active, the rogue also occasionally displays popup advertisements and attempts to connect to a few remote sites.


During execution, the following files are added:

  • %temp%\571.exe
  • %localappdata%\[random folder name]\[4 random characters]sysguard.exe
  • %windir%\system32\iehelper.dll

While the following hosts files are modified, with the following contents:




Upon execution, SysGuard will start the scanning process, which looks like the following screenshot:

To pressure the user further, SysGuard prevents some programs from launching, then displays the following message alleging that the program is infected and asking the user to 'start your antivirus software':

While active, the rogue attempts to connect the following URLs:

  • https://91.212.[...].227/check
  • https://193.[...].12.51/check

From time to time, it will display popup ads to the following websites:

  • www.porno. com
  • com
  • www.viagra. com
Registry Changes

The rogue makes the following changes to the Registry

  • [HKCR\CLSID\{B6D223F6-C185-49a2-BA7E-A03E84744702}] @="BHO"
  • [HKCR\CLSID\{B6D223F6-C185-49a2-BA7E-A03E84744702}\InProcServer32] @= C:\WINDOWS\system32\iehelper.dll" ThreadingModel="Apartment"
  • [HKLM\Software\Classes\CLSID\{B6D223F6-C185-49a2-BA7E-A03E84744702}] @="BHO"
  • [HKLM\Software\Classes\CLSID\{B6D223F6-C185-49a2-BA7E-A03E84744702}\InProcServer32] @="C:\WINDOWS\system32\iehelper.dll" ThreadingModel="Apartment"
  • [HKLM\Software\Software\Microsoft\Windows\CurrentVersion\run] {random_value}="%localappdata%\[random folder name]\[4 random characters]sysguard.exe"
  • [HKCU\Software\AvScan]
  • [HKCU\Software\Microsoft\Windows\CurrentVersion\run] {random_value}="%localappdata%\[random folder name]\[4 random characters]sysguard.exe"

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