Threat Descriptions

Trojan-Dropper:W32/Agent.FLN

Classification

Category :

Malware

Type :

Trojan-Dropper

Platform :

W32

Aliases :

Trojan-Dropper:W32/Agent.FLN, TrojanDropper:Win32/Alureon.gen!B (Microsoft)

Summary

This type of trojan contains one or more malicious programs, which it secretly installs and executes.

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

This trojan-dropper masquerades as a Homeview installer. In reality, its main purpose is to install Trojan:W32/DNSChanger.ARNF onto the system.

Execution

Upon execution, it will display the following fake screens, to mimic the legitimate installation sequence for Homeview:

Installation

While the fake installation screens are distracting user, the malware creates and executes this file:

  • %temp%\jah339312.exe

This file is detected as Trojan:W32/DNSChanger.ARNF.If the fake Homeview installation sequence is completed, a new folder named %Program Files%\homeview is created and this file is added to it:

  • %Program Files%\homeview\Uninstall.exe

This uninstaller is capable of removing the Homeview-related registry entries and deleting itself and its folder. It is however incapable of removing Trojan:W32/DNSChanger.ARNF, or the changes that malware makes to the system.

Registry Modifications

Creates these keys:

  • HKEY_CLASSES_ROOT\homeview\CLSID (default) = "{6BF52A52-394A-11D3-B153-00C04F79FAA6}"
  • HKEY_CURRENT_USER\Software\homeview (default) = "%Program Files%\homeview"
  • HKEY_CURRENT_USER\Software\{NSINAME} Start Menu Folder = "homeview"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\homeview\CLSID (default) = "{6BF52A52-394A-11D3-B153-00C04F79FAA6}"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\homeview UninstallString = "%Program Files%\homeview\Uninstall.exe" InstallLocation = "%Program Files%\homeview" DisplayName = "homeview" DisplayIcon = "%Program Files%\homeview\Uninstall.exe,0"