North American Network Operators Group
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Re: New attack against port 135?

  • From: Mike Tancsa
  • Date: Fri Oct 10 13:51:03 2003


Yes, we saw this yesterday and posted to full-disclosure. Here is a sample packet.

13:43:38.511675 xx:xx:xx:xx:xx:xx xx:xx:xx:xx:xx:xx 0800 62: 64.7.nn.yy.3512 > 16.181.zz.aa.135: S [tcp sum ok] 3772716186:3772716186(0) win 65340 <mss 1452,nop,nop,sackOK> (DF) (ttl 127, id 63248, len 48)
0x0000 4500 0030 f710 4000 7f06 e5d6 4007 975b [email protected]@..[
0x0010 10b5 36c9 0db8 0087 e0df 149a 0000 0000 ..6.............
0x0020 7002 ff3c 6151 0000 0204 05ac 0101 0402 p..<aQ..........

---Mike


At 01:26 PM 10/10/2003, Peter John Hill wrote:

I am seeing lots of scanning of port 135 on my network. 66 byte long packets. Anyone have a name for this? It is less aggressive than the welchia scans I have seen. Seems to scan at about 3000 or so flows per 5 minutes.

Thanks
Peter Hill
Network Engineer
Carnegie Mellon