[Scottish] Security breach

[John Gordon Ollason]

Greetings,

I received e-mail from the ISP that hosts my websites that my shell  
account had been used in a security breach. I have had a superificial  
check of my files, and can't find anything altered. What checks ought I to  
do to insure the integrity of my files? And what harm could my websites do  
if something nasty has been left behind?

Thanks for any advice.

John O.