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Re: FP 17246
From: "Weir, Jason" <jason.weir () nhrs org>
Date: Thu, 14 Oct 2010 12:04:34 -0400

Here is a PCAP of one that fired here..
 
-J

        -----Original Message-----
        From: Joel Esler [mailto:jesler () sourcefire com] 
        Sent: Thursday, October 14, 2010 10:49 AM
        To: Lay, James
        Cc: snort-sigs () lists sourceforge net
        Subject: Re: [Snort-sigs] FP 17246
        
        
        Are you sure that's the right packet dump?  That rule doesn't
match the packet at all (look at the content match) 

        J
        
        
        On Thu, Oct 14, 2010 at 10:43 AM, Lay, James <
james.lay () wincofoods com> wrote:
        

                Rule hit:

                10/14-08:38:47.457462  [**] [1:17246:1] SPECIFIC-THREATS
Multiple vendor Antivirus magic byte detection evasion attempt [**]
[Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} 
209.85.225.148:80 -> external_IP:61121

                 

                Rule:

                :alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any
(msg:"SPECIFIC-THREATS Multiple vendor Antivirus magic byte detection
evasion attempt"; flow:established,to_client;
content:"Content|2D|Type|3A 20|text|2F|html"; nocase; http_header;
pcre:"/\x0D\x0A?(MZ|PK|BZh|BZ|GIF8|BM|IC|PI|CI|CP)/"; metadata:policy
balanced-ips drop, policy security-ips drop, service http;
reference:cve,2005-3370; reference:cve,2005-3371;
reference:cve,2005-3372; reference:cve,2005-3373;
reference:cve,2005-3374; reference:cve,2005-3375;
reference:cve,2005-3376; reference:cve,2005-3377;
reference:cve,2005-3378; reference:cve,2005-3379;
reference:cve,2005-3380; reference:cve,2005-3381;
reference:cve,2005-3382; classtype:attempted-user; sid:17246; rev:1;)

                 

                Packet dump:

                08:39:10.499895 IP 209.85.225.148.80 >
66.193.105.132.61121: Flags [P.], ack 721, win 9648, length 204

                        0x0000:  4500 00f4 e376 0000 3906 3e5e d155 e194
E....v..9.>^.U..

                        0x0010:  42c1 6984 0050 eec1 18f5 f9bc 5329 87af
B.i..P......S)..

                        0x0020:  5018 25b0 637e 0000 4854 5450 2f31 2e31
P.%.c~..HTTP/1.1

                        0x0030:  2032 3030 204f 4b0d 0a43 6f6e 7465 6e74
.200.OK..Content

                        0x0040:  2d54 7970 653a 2069 6d61 6765 2f67 6966
-Type:.image/gif

                        0x0050:  0d0a 5072 6167 6d61 3a20 6e6f 2d63 6163
..Pragma:.no-cac

                        0x0060:  6865 0d0a 4361 6368 652d 436f 6e74 726f
he..Cache-Contro

                        0x0070:  6c3a 206e 6f2d 6361 6368 650d 0a43 6f6e
l:.no-cache..Con

                        0x0080:  7465 6e74 2d4c 656e 6774 683a 2034 330d
tent-Length:.43.

                        0x0090:  0a44 6174 653a 2054 6875 2c20 3134 204f
.Date:.Thu,.14.O

                        0x00a0:  6374 2032 3031 3020 3134 3a33 393a 3132
ct.2010.14:39:12

                        0x00b0:  2047 4d54 0d0a 5365 7276 6572 3a20 4746
.GMT..Server:.GF

                        0x00c0:  452f 322e 300d 0a0d 0a47 4946 3839 6101
E/2.0....GIF89a.

                       0x00d0:  0001 0080 0100 0000 00ff ffff 21f9 0401
............!...

                        0x00e0:  0000 0100 2c00 0000 0001 0001 0000 0202
....,...........

                        0x00f0:  4c01 003b
L..;

                 

                Looks like a .gif from google....

                 

                James

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Attachment: base_packet_51-1691.pcap
Description: base_packet_51-1691.pcap

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