Re: portscan log...

[Joe McAlerney <joey () SiliconDefense com>]

Hi Edwin,

It means the portscanner used TCP packets with only the SYN bit set. 
These packets are used to initiate TCP connections.  The person is
presumably looking for TCP services running on your box.

For more information on the portscan plugin, take a look at:

http://www.snort.org/docs/writing_rules/chap2.html#tth_sEc2.4.3

-Joe M.

-- 
Joe McAlerney
Software Developer / Security Consultant
joey () SiliconDefense com
Silicon Defense: IDS Solutions -=- http://www.silicondefense.com/

Edwin Pua wrote:
> Hi,
>
>       I saw this message under my portscan.log file and I know that this
> source ip 137.132.83.218 is scanning my ip 211.156.185.143 but what is
> SYN*****S* means?
>
> Jan 29 18:52:34 137.132.83.218:1999 -> 211.156.185.143:3372 SYN ******S*
> Jan 29 18:52:34 137.132.83.218:2000 -> 211.156.185.143:3373 SYN ******S*
> Jan 29 18:52:35 137.132.83.218:2003 -> 211.156.185.143:3376 SYN ******S*
> Jan 29 18:52:36 137.132.83.218:2004 -> 211.166.185.143:3377 SYN ******S*
> Jan 29 18:52:36 137.132.83.218:2005 -> 211.166.185.143:3378 SYN ******S*
> Jan 29 18:52:37 137.132.83.218:2006 -> 211.166.185.143:3379 SYN ******S*
> Jan 29 18:52:37 137.132.83.218:2007 -> 211.166.185.143:3380 SYN ******S*
> Jan 29 18:52:38 137.132.83.218:2008 -> 211.166.185.143:3381 SYN ******S*
> Jan 29 18:52:38 137.132.83.218:2010 -> 211.166.185.143:3383 SYN ******S*
> Jan 29 18:52:39 137.132.83.218:2011 -> 211.166.185.143:3384 SYN ******S*
> Jan 29 18:52:39 137.132.83.218:2012 -> 211.166.185.143:3385 SYN ******S*
> Jan 29 18:52:40 137.132.83.218:2014 -> 211.166.185.143:3387 SYN ******S*
>
> rgds,
> edwin
>
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