email security..silent installer

[teknicalissue]

how is it possible to create a silent installer...i found out about it not to long ago when i was emailed one and purposely clicked on it, it was no more than 1MB and the little thing was zipped and it installed 4 forms of spyware on to my computer (mainly the fake spyware and antivirus programs) how can something so small cause something to install thats around 331.9MB and more...all i know is that it is a silent installer and it requires the internet to install the programs..can anyone shed some light to my obvious mystery?

[gordo]

http://www.viruslist.com/en/virusesdescribed?chapter=153318100
Could be a trojan downloader

[coz]

Heres a short definition of what you talking about...
http://en.wikipedia.org/wiki/Dropper

These can also be called downloaders.

[teknicalissue]

interesting..anyone here know how to perform such tasks for educational purposes ;)

[gordo]

a quick rundown, one way is you will need a downloader trojan and a exe file binder, both undetected to virus scanners. Configure your trojan, bind with another file, (it could be pic/video/text file, but the output must be an exe) then send away. The recipient will need to run (double click) it.