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FP 17246
From: "Lay, James" <james.lay () wincofoods com>
Date: Thu, 14 Oct 2010 08:43:06 -0600

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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