This type of trojan secretly downloads malicious files from a remote server, then installs and executes the files.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Trojan-Downloader:W32/Small identifies one of more than 370 variants (as of June 28 2004) in this large malware family. The main characteristics of these programs are:
- They are very compact (a few kilobytes long).
- They silently download and run executable files on a user's computer.
Many variants are compressed (bya variety of file compressor programs) to reduce their size and hide their contents from the user.
Some Small variants download adware, spyware and searchware (third-party search plugins); others download trojans and backdoors.
Small variants are often silently installed on a user's system via a driveby download when the user visits a malicious website.