We all know there aren’t any linux viruses out in the wild (unlike most other OS’s like xp, vista or osx) and script kiddies don’t have much success doe to sudo in ubuntu.
So most people will be save. However …
Linux can be affected by rootkits.
A rootkit is a program (or combination of several programs) designed to take fundamental control (in Unix terms “root” access, in Windows “Administrator” access) of a computer system, without authorization by the system’s owners and legitimate managers. Access to the hardware (i.e., the reset switch) is rarely required as a rootkit is intended to seize control of the operating system running on the hardware. Typically, rootkits act to obscure their presence on the system through subversion or evasion of standard operating system security mechanisms.
Harmfull rootkits are pretty rare and I never heard of people getting one.
But if you are feeling paranoid, you can install rkhunter.
sudo apt-get install rkhunter
To run the program use this command.
sudo rkhunter -c
I’ve gotten two non-rootkit related warnings.
One for allowing ssh root access and one because there are hidden files on my box.
Nothing I didn’t knew.
You can get more info about the program and it’s options by just typing “rkhunter” in a terminal.
This small article on how a hacker would put a rootkit on your system is worth a read.