Rogue:W32/SysGuard.D

Classification

Rogue:W32/SysGuard.D, Rogue:W32/SysGuard.E, Trojan-Downloader:W32/FraudPack.AB, Trojan.Win32.FraudPack.zyw, Trojan.Win32.FraudPack.zyb

Summary

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.

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.

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.

Execution

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:

91.212.127.227 aviraplatinum2009.microsoft.com
91.212.127.227 aviraplatinum2009.com
91.212.127.227 www.aviraplatinum2009.com

91.212.127.227 antiviraprof2009.microsoft.com
91.212.127.227 antiviraprof2009.com
91.212.127.227 www.antiviraprof2009.com

Activity

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
https://aviraplatinum2009.com/[...].php?[...].1

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

www.porno. com
www.adult. 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"