Snort mailing list archives
Re: Syn Scan
From: James Riden <j.riden () massey ac nz>
Date: Fri, 04 Mar 2005 11:08:33 +1300
"Dominic" <dominic () multilink co za> writes:
Hi, Does snort alert on SYN scans - I have tried all others and I see the alerts but nothing for a SYN scan?
Depending on your preprocessor options, a SYN (or half-open) scan will look like this in /var/log/snort/portscan.log: Mar 4 08:35:49 x.y.z.230:4508 -> x.y.a.169:139 SYN ******S* Mar 4 08:35:49 x.y.z.230:4510 -> x.y.a.170:139 SYN ******S* Mar 4 08:35:49 x.y.z.230:4509 -> x.y.a.170:445 SYN ******S* Mar 4 08:35:49 x.y.z.230:4512 -> x.y.a.171:139 SYN ******S* Mar 4 08:35:49 x.y.z.230:4511 -> x.y.a.171:445 SYN ******S* Mar 4 08:35:49 x.y.z.230:4514 -> x.y.a.172:139 SYN ******S* Mar 4 08:35:49 x.y.z.230:4513 -> x.y.a.172:445 SYN ******S* Mar 4 08:35:49 x.y.z.230:4516 -> x.y.a.173:139 SYN ******S* Mar 4 08:35:49 x.y.z.230:4515 -> x.y.a.173:445 SYN ******S* Mar 4 08:35:49 x.y.z.230:4518 -> x.y.a.174:139 SYN ******S* <snip> Of course, this is scanning the same port across different hosts - you may also see different ports scanned against the same host - typical of a 'nmap -sS targethost' That's with the following in snort.conf: preprocessor portscan: any 30 5 portscan.log cheers, Jamie -- James Riden / j.riden () massey ac nz / Systems Security Engineer Information Technology Services, Massey University, NZ. GPG public key available at: http://www.massey.ac.nz/~jriden/ ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- Syn Scan Dominic (Mar 03)
- Re: Syn Scan James Riden (Mar 03)
- Re: Syn Scan Jeremy Hewlett (Mar 04)