When I use normal rule like:
alert tcp any any -> any any (msg:"JPEG"; content:"|FF D8 FF E0|"; sid:1000001)
Also there is no alert.
It mean Snort does not catch data file when downloading from internet.
So I think I configured wrong in somewhere.
Do your guys have experience about this case?
Thank you.

On Tue, May 22, 2018 at 7:16 PM, Tai Ly <haotai1803@gmail.com> wrote:
Thank you for your help.

I read this file and do some step as below:

- Add some line in the end of snort.conf
# File Inspect Configuration
preprocessor file_inspect: type_id, signature, \
  capture_queue_size 5000, \
  capture_disk /home/file_capture/tmp/

 
# File magic reference
include file_magic.conf

- and I try with 2 rules:
1. alert (msg: "JPEG file"; gid:146; sid:70;)
2. alert tcp any any -> any any (msg: "JPEG file"; file_type:JPEG; sid:1000001)

- I use this command to run snort:
sudo snort -A console -q -u snort -g snort -c /etc/snort/snort.conf -i wlan0

But when I download JPEG file from internet , there is no alert.  
Do I missing somethings? 


On Tue, May 22, 2018 at 6:45 PM, Tai Ly <haotai1803@gmail.com> wrote:
Thank you for your help.

I read this file and do some step as below:

- Add some line in the end of snort.conf
# File Inspect Configuration
preprocessor file_inspect: type_id, signature, \
  capture_queue_size 5000, \
  capture_disk /home/file_capture/tmp/

 
# File magic reference
include file_magic.conf

- and I try with 2 rules:
1. alert (msg: "JPEG file"; gid:146; sid:70;)
2. alert tcp any any -> any any (msg: "JPEG file"; file_type:JPEG; sid:1000001)

- I use this command to run snort:
sudo snort -A console -q -u snort -g snort -c /etc/snort/snort.conf -i wlan0

But when I download JPEG file from internet , there is no alert.  
Do I missing somethings? 

On Tue, May 22, 2018 at 9:51 AM, Al Lewis (allewi) <allewi@cisco.com> wrote:

Yes. See the README.file in the docs directory.

 

 

Albert Lewis

ENGINEER.SOFTWARE ENGINEERING

Cisco Systems Inc.

Email: allewi@cisco.com 

 

From: Snort-sigs <snort-sigs-bounces@lists.snort.org> on behalf of Hào Tài via Snort-sigs <snort-sigs@lists.snort.org>
Reply-To: Hào Tài <haotai1803@gmail.com>
Date: Monday, May 21, 2018 at 8:50 PM
To: "snort-sigs@lists.snort.org" <snort-sigs@lists.snort.org>
Subject: Re: [Snort-sigs] Can Snort detect a download file from internet?

 

Can everyone help me to confirm this point: " Can the Snort detect a file from the internet" ?

If yes , how do we config the Snort the get the content file?

 

 

On Sun, May 20, 2018 at 3:23 PM, Hào Tài <haotai1803@gmail.com> wrote:

Hello everyone,

 

I am a newbie about Snort. I try to write the snort rule to catch a download JPG file from internet. Here is my rule:

 

>> alert tcp any any <> $HOME_NET any (msg:"JPEG"; content:"|FF D8 FF E0|"; sid:1000001)

 

But it does not work. Do I missing somethings or do I need to config somethings for Snort?

Can everybody help me to find out the problem? Thank you.

 

Regards,

Tai Ly