This type of trojan secretly downloads malicious files from a remote server, then installs and executes the files.


Automatic action

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.

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Technical Details

The trojan-downloader Agent.IDO drops the following files onto the system:

  • %windir%\system32\win.exe
  • %ProgramFiles%\Microsoft Commom\svchost.exe

The svchost.exe file is detected as Trojan-Downloader:W32/Agent.IDP.


The downloading component of this trojan-downloader is actually another malware, Agent.IDP, which is part of its payload. Once dropped, Agent.IDP adds the following autorun key to the Windows registry, so that it will run at each subsequent startup:

  • Key: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer Value: Debugger Data: %Program Files%\Microsoft Common\svchost.exe

When executed, Agent.IDP attempts to connect to the following websites:


Fortunately, these websites are currently not operational.

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