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Re: FP 17246
From: rmkml <rmkml () free fr>
Date: Thu, 14 Oct 2010 17:03:31 +0200 (CEST)

Hi James,
VRT have moved (disabled) this rule to deleted.rules on rev 3 in SEU 372.
Regards
Rmkml


On Thu, 14 Oct 2010, Lay, James 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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