Threat Description



Aliases: Small.DDY
Category: Malware
Type: Trojan-Downloader
Platform: W32


Small.DDY is a trojan downloader that attempts to secretly download and execute a file from a malicious website.See below for details.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.


Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.

Technical Details

Small.DDY is an FSG packed malware that injects malicious code into svchost.exe. It does so by creating a new instance of svchost.exe using the malware as its parameter. After execution it deletes the executable file.The injected malware code checks for an Internet connection every 250ms. Once an Internet connection has been established, it will attempt to download and execute a file from the following URL:


The downloaded file is saved in the Windows directory using the filename: au.exe.


F-Secure Anti-Virus detects this malware with the following updates:

Detection Type: PC
Database: 2006-07-10_02


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