annoying ftp probes

From: Emil Popov (emoat_private)
Date: Mon Aug 20 2001 - 03:33:03 PDT

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    Hi,
    
    I have been getting some annoying connections to my ftpd like:
    
    Aug 20 07:58:28 ds ftpd[7527]: connection from cc821361-d.vron1.nj.home.com
    Aug 20 07:58:29 ds ftpd[7527]: ANONYMOUS FTP LOGIN FROM cc821361-d.vron1.nj.home.com, guestat_private
    Aug 20 07:58:30 ds ftpd[7527]: mkdir 010820012936p
    Aug 19 06:37:34 ds ftpd[20081]: connection from ip-90-202.evc.net
    Aug 19 06:37:35 ds ftpd[20081]: ANONYMOUS FTP LOGIN FROM ip-90-202.evc.net, guestat_private
    Aug 19 06:37:36 ds ftpd[20081]: mkdir 010819061100p
    
    they are comming from various ISP's at random time intervals.
    I seems that this is some scanner that searches for world-writable
    ftp sites, and since those requests have been comming from *almost*
    random hosts, i am only able to cumulatively add whole isp domains
    to my hosts.deny. I added a responce line i.e. an instant nmap to those guys,
    and up to now my nmap resulted in scanning either the firewall of the isp,
    or a windows machine ( win :), they may soon get an automated dos if they keep on :)) ).
    
    So i presume it's i win tool.
    
    Any Idea what the tool is?
    Any Idea of a better defence (not that my site is world-writable but anyway..)
    
    Thanks
    
    p.s. There is very famous WarezFTP site in Bulgaria, and i see them getting those same (in format)
    directories created, so it really seems like a scanner that just goes aroung mkdir'ing.
    
    p.s.s Sorry for mentioning the un-masked hostnames, but i believe they deserve that.
    
    Emil Popov
    Primasoft Ltd.
    emoat_private
    
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