full-disclosure - repeated port 21 attempts

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Date: Wed Jun 14 05:43:00 2006
From: dunhamk at rica.net (Ken Dunham)
Subject: repeated port 21 attempts

>> I'm getting port 21 connection attempts every 5 minutes from about 
> half a dozen of my network users. These attempts are repeating 
> regularly with one computer sending out 1500+ attempts a day. I have 
> not seen this before and I'm wondering if anyone else here has seen a
client behave this way before?

Hi,
Sounds like FTP and SSH attacks that are opportunistically launched by
Romanian attackers to date, simple brute force and a few other hacking
exploits.  It's a consistent issue we've seen globally for many months now.

Cheers,
Ken