Rogue:W32/PurityScan

Classification

Riskware

Rogue

W32

-

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

Automatic action

Based on the settings of your F-Secure security product, it may block the file from running, move it to the quarantine where it cannot spread or cause harm, or ask you to select an action.

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Submit a sample

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Technical Details

Rogue:W32/PurityScan is a program from ClickSpring LLC that can monitor the user's browsing habits and send back the collected data to its servers. It will also download content from its servers to display as pop-up advertisements.

Installation

PurityScan is another variant of ClickSpring. There have also been a few reports that the program may also be bundled with other spyware and/or adware programs and sometime it maybe installed together with freeware applications or games.

When the program is executed manually, an End User License Agreement (EULA) and Privacy Policy is displayed:

The user must accept the EULA in order to proceed with installation. After accepting the EULA, PurityScan is silently installed to the system.

During installation, the main executable and uninstaller is dropped at the following path:

  • C:\Program Files\PurityScan\PuritySCAN.exe
  • C:\Program Files\PurityScan\PuritySCANUninstall.exe

PurityScan will also drop files at:

  • %UserProfile%\[user]\Local Settings\temp\wups.exe
  • %UserProfile%\[user]\Application Data\[random file name].exe, for example
  • %UserProfile%\[user]\Application Data\rcoa.exe
  • %UserProfile%\[user]Application Data\neni

It then creates a shortcut item in start menu program:

  • %UserProfile%\Start Menu\Programs\Purity Scan

Activity

Once installed, PurityScan registers itself by sending details of the system it has been installed on back to the server at fp.clickspring.net. It then retrieves advertising contents and updates of itself from www.clickspring.netand pisces.clickspring.net.

Registry

PurityScan creates the following registry subkey, so that it will execute automatically each time Windows starts:

  • [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run][Random name]=%UserProfile%\[user]\Application Data\[Random file name]

The following registry subkey is also created, so that it appears in the Add/Remove program list:

  • [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\PuritySCAN]

Date Created: 2009-03-16 08:48:17.0

Date Last Modified: 2009-04-28 05:28:22.0