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Network Security Snort-Signatures
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Re: [Snort-sigs] For Instance: Hostile FTP Sigs

Subject: Re: [Snort-sigs] For Instance: Hostile FTP Sigs
Date: Mon, 31 Dec 2007 10:18:08 -0500
On Dec 31, 2007, at 2007/12/31 10:04 AM, Matt Jonkman wrote:
#by Matt Jonkman
# Just stats codes, no welcome, etc. Very unique
# something like:
#220
#USER a
#331
#PASS a
#230
#TYPE I
#200
#PORT 10,2,32,214,4,9
#200
#RETR msnnmaneger.exe
#150
#226
#QUIT
#221


alert tcp any 1024: -> $HOME_NET 1024: (msg:"BLEEDING-EDGE
ATTACK_RESPONSE Off-Port FTP Without Banners - 220";
flow:established,to_server; dsize:6; content:"220 |0d 0a|"; offset:0;
depth:6; flowbits:noalert; flowbits:set,ET.strippedftp220; sid: 
2007714;
rev:1;)

<strip a bunch of FTP state rules>

Why write 9 extra rules when a tag on this 1 rule will accomplish the  
same thing and provide even more "useful" data.

-brian

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