logcheck

[debian-isp]

Hey Guys,
Do any of you know what may have caused this message in my syslogs?

Unusual System Events
=-=-=-=-=-=-=-=-=-=-=
Sep 19 06:25:02 ghost su[322]: + ??? root-nobody 
Sep 19 06:25:02 ghost PAM_unix[322]: (su) session opened for user nobody
by (uid=0)


I am unsure of what the ??? represents and what root-nobody is.

Any help appriciated!

D. Ghost


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