i had the same issue,
thing is bot ping timeout's after the "Attacker" uses him.
i run a botnet for 5 years now...keep my accs clean and stuff no stupid hosts no nothing. the log is clean, it just doesent show anything happening and yet my eggdrop is opping unknown nicks...
the REALLY BAD thing is i had the same problem with an emech...on another chan... really there is no problem with hosts, chanfix, etc
i heard they can access psybnc too, but it didnt happen to me...
WTF?