[Snort-sigs] New SMB_COM_TRANSACTION alerts look pretty "broken"

Brian bmc at ...95...
Thu Apr 10 23:49:06 EDT 2003


Hrpmf.  Do me a favor and try:

alert tcp any any -> any 139 (msg:"NETBIOS SMB SMB_COM_TRANSACTION Max Parameter of 0 DOS Attempt"; flow:to_server,established; content:"|00|"; offset:0; depth:1; content:"|FF 53 4D 42 25|"; offset:4; depth:5; content:"|00 00 00 00|"; offset:43; depth:4;)

-brian

On Mon, Apr 07, 2003 at 10:00:45AM +1200, Jason Haar wrote:
> ...I say that because the moment I told Snort to alert on them, it triggered
> over 1,000 alerts in ~3 min on a 10M WAN link. 
> 
> BTW this is the "NETBIOS SMB SMB_COM_TRANSACTION Max Data Count of 0 DOS
> Attempt" alert - not the "NETBIOS SMB SMB_COM_TRANSACTION Max Parameter
> Count of 0 DOS Attempt" one.
> 
> A quick glance seems to show this is triggering on connections from Win2K
> clients to both WinNT4 and Win2K servers.
> 
> This is under snort 1.9.1
> 
> -- 
> Cheers
> 
> Jason Haar
> Information Security Manager, Trimble Navigation Ltd.
> Phone: +64 3 9635 377 Fax: +64 3 9635 417
> PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1
> 
> 
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