RE: [Snort-sigs] FP for NETBIOS SMB-DS DCERPC NTLMSSP asn1 overflow attempt: sid

Question:

Are you posting this to the sigs list because you think they should be 
removed? Or are you asking the list about why the alerts are triggering??

Shirkdog


> From: Russell Fulton <r.fulton@auckland.ac.nz>
> To: snort-sigs@lists.sourceforge.net
> Subject: [Snort-sigs] FP for NETBIOS SMB-DS DCERPC NTLMSSP asn1 overflow 
> attempt: sid 2383
> Date: Tue, 19 Oct 2004 13:11:51 +1300
>
> I am seeing many (over a thousand a day) of these on our internal
> network on sessions between well managed machines that I would expect to
> be communicating on port 455.   A quick look at the data portion does
> not appear malicious (no padding or other evidence of overflow attempt).
>
> DATA (Ascii below)
>
> 0000015EFF534D427300
>
> 0000001807C800000000
>
> 00000000000000000000
>
> FFFE000820000CFF005E
>
> 0104110A000000000000
>
> 00BC0000000000D40000
>
> A023014E544C4D535350
>
> 0003000000180018007C
>
> 00000018001800940000
>
> 00120012004800000010
>
> 0010005A000000120012
>
> 006A00000010001000AC
>
> 000000158288E2050128
>
> 0A0000000F4A00410044
>
> 00520041004E004B0041
>
> 0054006A006100640072
>
> 0061006E006B0061004A
>
> 0041004400520041004E
>
> 004B0041005400C1B0DB
>
> B0304BF1650000000000
>
> 00000000000000000000
>
> 00CD042F76B4B3AC6BB6
>
> 3B01139F4D8044D22803
>
> 41AFBE4C952487BF4509
>
> FF82148771BBC3F1D11A
>
> 1B00570069006E006400
>
> 6F007700730020003200
>
> 30003000320020005300
>
> 65007200760069006300
>
> 65002000500061006300
>
> 6B002000320020003200
>
> 36003000300000005700
>
> 69006E0064006F007700
>
> 73002000320030003000
>
> 3200200035002E003100
>
>
>
> ...^.SMBs.
>
> ..........
>
> ..........
>
> .... ....^
>
> ..........
>
> ..........
>
> .#.NTLMSSP
>
> .........|
>
> ..........
>
> .....H....
>
> ...Z......
>
> .j........
>
> .........(
>
> .....J.A.D
>
> .R.A.N.K.A
>
> .T.j.a.d.r
>
> .a.n.k.a.J
>
> .A.D.R.A.N
>
> .K.A.T....
>
> .0K.e.....
>
> ..........
>
> .../v...k.
>
> ;...M.D.(.
>
> A..L.$..E.
>
> ....q.....
>
> ..W.i.n.d.
>
> o.w.s. .2.
>
> 0.0.2. .S.
>
> e.r.v.i.c.
>
> e. .P.a.c.
>
> k. .2. .2.
>
> 6.0.0...W.
>
> i.n.d.o.w.
>
> s. .2.0.0.
>
> 2. .5...1.
> --
> Russell Fulton, Information Security Officer, The University of Auckland
> New Zealand
>
>
>
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