need help on how to kill irc

hi I saw this on my server running

nobody 16421 0.0 0.0 2096 4 ? S Nov29 0:00 sh -c ./stealth irc.undernet.org 53 2>&1 3>&1


how do I kill this? i did kill it actually by using kill then pid. but its still there.

how would I find who is running this?

 

 

 

 

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