What is Qscan?
The Malwarebytes research team has determined that Qscan is a fake anti-malware application. These so-called "rogues" use intentional false positives to convince users that their systems have been compromised. Then they try to sell you their software, claiming it will remove these threats. In extreme cases the false threats are actually the very trojans that advertise or even directly install the rogue. You are strongly advised to follow our removal instructions below.
How do I know if I am infected with Qscan?
This is how the main screen of the rogue application looks:
You will find these icons on your desktop and in your taskbar:
And see these warnings:
How did Qscan get on my computer?
Rogue programs use different methods for spreading themselves. This particular one was downloaded from their site.
How do I remove Qscan?
Our program Malwarebytes' Anti-Malware can detect and remove this rogue application.
- Please download Malwarebytes' Anti-Malware to your desktop.
- Double-click mbam-setup.exe and follow the prompts to install the program.
- At the end, be sure a check-mark is placed next to the following:
- Update Malwarebytes' Anti-Malware
- 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 quick scan, then click Scan.
- When the scan is complete, click OK, then Show Results to view the results.
- Be sure that everything is checked, and click Remove Selected. Reboot your computer if prompted.
- When completed, a log will open in Notepad. The rogue application should now be gone.
Is there anything else I need to do to get rid of Qscan?
- The shortcut called Q½ºÄµ on the desktop can be deleted if it belonged to the rogue. Look at the screenshot posted above if you are in doubt.
How would the full version of Malwarebytes' Anti-Malware help protect me?
We hope our application has helped you eradicate this malicious software. If your current security solution let this infection through, you might please consider purchasing the FULL version of Malwarebytes' Anti-Malware for additional protection.
As you can see below the full version of Malwarebytes' Anti-Malware would have protected you against the Qscan rogue. It would have warned you before the rogue could install itself, giving you a chance to stop it before it became too late.
Technical details for experts
Signs in a HijackThis log:
C:\Program Files\QScan\QScan.exe C:\Program Files\QScan\QScanMon.exe O4 - HKLM\..\Run: [QScan] "C:\Program Files\QScan\QScan.exe" /run1
Alterations made by the installer:
File System =============== In the existing folder C:\Documents and Settings\All Users\Desktop Adds the file Q��ĵ.lnk"="16:15 27/11/10 638 bytes Adds the folder C:\Documents and Settings\All Users\Start Menu\Programs\Q��ĵ Adds the file Q��ĵ.lnk"="16:15 27/11/10 650 bytes Adds the file Q��ĵ ����.lnk"="16:15 27/11/10 485 bytes Adds the folder C:\Program Files\QScan Adds the file uninst.exe"="16:15 27/11/10 175206 bytes Adds the file QScanMon.exe"="03:53 28/10/10 783872 bytes Adds the file QScancfg.exe"="06:32 30/09/10 1887744 bytes Adds the file QScan.exe"="03:53 28/10/10 4949504 bytes Registry =============== [HKEY_LOCAL_MACHINE\SOFTWARE\QScan] "Environment"="'11111111111111'" "UpdateVersion"="'1.000'" "Version"="'1.000'" "InstallDate"="'20101127'" "pid"="'home'" [HKEY_LOCAL_MACHINE\SOFTWARE\QScanPartner] "install"="'install_check'" [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\QScan.exe] "(Default)"="'C:\Program Files\QScan\QScan.exe'" [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] "QScan"="'"C:\Program Files\QScan\QScan.exe" /run1'" [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\QScan] "DisplayVersion"="'1.000'" "DisplayIcon"="'C:\Program Files\QScan\QScan.exe'" "UninstallString"="'C:\Program Files\QScan\uninst.exe'" "DisplayName"="'Q��ĵ'"
Malwarebytes' Anti-Malware log:
Malwarebytes' Anti-Malware 1.46 www.malwarebytes.org Database version: 5199 Windows 5.1.2600 Service Pack 3 Internet Explorer 6.0.2900.5512 11/27/2010 4:26:30 PM mbam-log-2010-11-27 (16-26-30).txt Scan type: Quick scan Objects scanned: 125932 Time elapsed: 4 minute(s), 29 second(s) Memory Processes Infected: 2 Memory Modules Infected: 0 Registry Keys Infected: 3 Registry Values Infected: 1 Folders Infected: 1 Files Infected: 4 Memory Processes Infected: C:\Program Files\QScan\QScan.exe (Rogue.QScan) -> Unloaded process successfully. C:\Program Files\QScan\QScanMon.exe (Rogue.QScan) -> Unloaded process successfully. Memory Modules Infected: (No malicious items detected) Registry Keys Infected: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\qscan (Rogue.QScan) -> Quarantined and deleted successfully. HKEY_LOCAL_MACHINE\SOFTWARE\QScan (Rogue.QScan) -> Quarantined and deleted successfully. HKEY_LOCAL_MACHINE\SOFTWARE\QScanPartner (Rogue.QScan) -> Quarantined and deleted successfully. Registry Values Infected: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\qscan (Rogue.QScan) -> Quarantined and deleted successfully. Folders Infected: C:\Program Files\QScan (Rogue.QScan) -> Quarantined and deleted successfully. Files Infected: C:\Program Files\QScan\QScan.exe (Rogue.QScan) -> Quarantined and deleted successfully. C:\Program Files\QScan\QScancfg.exe (Rogue.QScan) -> Quarantined and deleted successfully. C:\Program Files\QScan\QScanMon.exe (Rogue.QScan) -> Quarantined and deleted successfully. C:\Program Files\QScan\uninst.exe (Rogue.QScan) -> Quarantined and deleted successfully.
As mentioned before the full version of Malwarebytes' Anti-Malware could have protected your computer against this threat.
We use different ways of protecting your computer(s):
- Dynamically Blocks Malware Sites & Servers
- Malware Execution Prevention