TrojanDownloader.Win32.Small

Classification

Malware

Trojan-Downloader

W32

TrojanDownloader.Win32.Small

Summary

The 'Small' trojan downloader family consists of more than 370 different variants (info by June 28th, 2004). The main characteristic of these downloaders is that they are very compact (a few kilobytes long) and that they hiddenly download and run executable files on a user's computer.

Removal

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.

Suspect a file is incorrectly detected (a False Positive)?

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 detection database 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.

Find out more

Knowledge Base

Find the latest advice in our Community Knowledge Base.

User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

Many of these downloaders are compressed with different file compressors to reduce their size and to hide their contents from users' eyes. Some of the downloaders from the 'Small' family download adware/spyware, searchware (third-party search plugins), some of them download real trojans and backdoors. But they all do that without any notification to a user and without his approval.

Quite often these downloaders are dropped and activated on users' computers from webpages that are visited with Internet Explorer.

For the generic description of a trojan downloader and for disinfection instructions for this type of malware please refer to this webpage:

Http://www.f-secure.com/v-descs/trojdown.shtml