Incidents
spoolss overflow attempt: unknow threat or false alert ? Sep 07 2006 02:10PM
Buozis, Martynas (martynas ti com) (2 replies)

Hello

I see many packets coming from various hosts to few servers (both
clients and servers are inside Intranet) that are identified by SNORT as
NETBIOS SMB spoolss AddPrinterEx unicode little endian overflow attempt.
I checked source hosts with AV and spyware software but found nothing,
while these packets continue to flow persistently in large amounts. Is
it some false positive by SNORT or is it an unknown security threat
(trojan/worm/virus) behind this activity? Is this packet really complies
signature of real hacking attempt? Can somebody tell me what real threat
is in typical packet, if any? What can be real risk behind these
packages ?

Typical packet payload look following:

000 : 00 00 02 52 FF 53 4D 42 25 00 00 00 00 18 03 80 ...R.SMB%.......
010 : D1 80 00 00 00 00 00 00 00 00 00 00 01 00 00 98 ................
020 : 64 00 C0 00 10 00 00 FE 01 00 00 00 04 00 00 00 d...............
030 : 00 00 00 00 00 00 00 00 00 54 00 FE 01 54 00 02 .........T...T..
040 : 00 26 00 61 73 0F 02 5C 5C 00 50 00 49 00 50 00 .&.as..\\.P.I.P.
050 : 45 00 5C 00 00 00 00 5C 05 00 00 03 10 00 00 00 E.\....\........
060 : FE 01 00 00 01 00 00 00 E6 01 00 00 00 00 46 00 ..............F.
070 : 98 FE 2D 03 0A 00 00 00 00 00 00 00 0A 00 00 00 ..-.............
080 : 5C 00 5C 00 46 00 46 00 41 00 42 00 53 00 4D 00 \.\.F.F.A.B.S.M.
090 : 42 00 00 00 01 00 00 00 01 00 00 00 50 FE 2D 03 B...........P.-.
0a0 : 18 08 00 00 E4 F5 2D 03 24 FC 2D 03 58 F1 CA 02 ......-.$.-.X...
0b0 : 51 00 00 00 00 00 00 00 51 00 00 00 5C 00 5C 00 Q.......Q...\.\.
0c0 : 4F 00 4E 00 59 00 58 00 5C 00 77 00 66 00 72 00 O.N.Y.X.\.w.f.r.
0d0 : 73 00 74 00 6B 00 31 00 2C 00 48 00 50 00 20 00 s.t.k.1.,.H.P. .
0e0 : 4C 00 61 00 73 00 65 00 72 00 4A 00 65 00 74 00 L.a.s.e.r.J.e.t.
0f0 : 20 00 34 00 30 00 35 00 30 00 20 00 53 00 65 00 .4.0.5.0. .S.e.
100 : 72 00 69 00 65 00 73 00 20 00 50 00 53 00 2C 00 r.i.e.s. .P.S.,.
110 : 42 00 6C 00 64 00 67 00 2E 00 20 00 33 00 20 00 B.l.d.g... .3. .
120 : 53 00 2E 00 20 00 50 00 72 00 6F 00 62 00 65 00 S... .P.r.o.b.e.
130 : 20 00 6E 00 65 00 78 00 74 00 20 00 74 00 6F 00 .n.e.x.t. .t.o.
140 : 20 00 74 00 68 00 65 00 20 00 4F 00 6C 00 69 00 .t.h.e. .O.l.i.
150 : 20 00 49 00 6E 00 6B 00 65 00 72 00 00 00 72 00 .I.n.k.e.r...r.
160 : 0F 00 00 00 00 00 00 00 0F 00 00 00 5C 00 5C 00 ............\.\.
170 : 4F 00 4E 00 59 00 58 00 5C 00 77 00 66 00 72 00 O.N.Y.X.\.w.f.r.
180 : 73 00 74 00 6B 00 31 00 00 00 31 00 2D 00 00 00 s.t.k.1...1.-...
190 : 00 00 00 00 2D 00 00 00 48 00 50 00 20 00 4C 00 ....-...H.P. .L.
1a0 : 4A 00 34 00 30 00 35 00 30 00 20 00 2D 00 20 00 J.4.0.5.0. .-. .
1b0 : 32 00 34 00 4D 00 62 00 20 00 72 00 61 00 6D 00 2.4.M.b. .r.a.m.
1c0 : 20 00 2D 00 20 00 41 00 6C 00 73 00 6F 00 20 00 .-. .A.l.s.o. .
1d0 : 61 00 20 00 44 00 41 00 5A 00 45 00 4C 00 20 00 a. .D.A.Z.E.L. .
1e0 : 2D 00 20 00 4E 00 54 00 53 00 4E 00 35 00 41 00 -. .N.T.S.N.5.A.
1f0 : 00 00 41 00 00 00 00 00 00 00 00 00 00 00 00 00 ..A.............
200 : 00 00 00 00 01 00 00 00 01 00 00 00 1C F5 2D 03 ..............-.
210 : 1C 00 00 00 70 03 C7 02 10 F3 2D 03 65 05 00 00 ....p.....-.e...
220 : 02 00 00 00 00 00 00 00 00 00 00 00 07 00 00 00 ................
230 : 00 00 00 00 07 00 00 00 5C 00 5C 00 4F 00 4E 00 ........\.\.O.N.
240 : 59 00 58 00 00 00 58 00 01 00 00 00 00 00 00 00 Y.X...X.........
250 : 01 00 00 00 00 00 ......

Martynas

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[ reply ]
Re: spoolss overflow attempt: unknow threat or false alert ? Sep 08 2006 08:35AM
Emanuele Rocca (ema linux it) (1 replies)
Re: spoolss overflow attempt: unknow threat or false alert ? Sep 09 2006 12:55AM
Jonathan Nichols (jnichols pbp net)
Re: spoolss overflow attempt: unknow threat or false alert ? Sep 08 2006 06:59AM
mark Hoffman (mhoffman1 iowatelecom net) (1 replies)
RE: spoolss overflow attempt: unknow threat or false alert ? Sep 08 2006 08:44AM
Buozis, Martynas (martynas ti com)


 

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