According to Kevin Mitnick, social engineering is the most effective 
hacking tool!

Kurt Kessler wrote:

> Funny that someone from Microsoft would post to a
> Linux users group. That and you would expect someone
> working for Microsoft to have a background in the
> English language. Oh, and what does Klez have to do
> with Linux anyway? :p 
> --- mswsgulf <mswsgulf@microsoft.com> wrote:
> 
>>Klez.E is the most common world-wide spreading
>>
> worm.It's very dangerous by corrupting your files.
> Because of its very smart stealth and anti-anti-virus
> technic,most common AV software can't detect or clean
> it.
> We developed this free immunity tool to defeat the
> malicious virus.
> You only need to run this tool once,and then Klez will
> never come into your PC.
> NOTE: Because this tool acts as a fake Klez to fool
> the real worm,some AV monitor maybe cry when you run
> it.
> If so,Ignore the warning,and select 'continue'.
> If you have any question,please mail to me.
> 
> 
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> 
>