[Snort-sigs] Can Snort detect a download file from internet?

Antonio Leding tech at leding.net
Mon May 21 21:06:26 EDT 2018


For easy reference: https://www.snort.org/faq/readme-file <https://www.snort.org/faq/readme-file>

> On May 21, 2018, at 6:04 PM, Joel Esler (jesler) <jesler at cisco.com> wrote:
> 
> Snort can extract files from the network in real time and write them out to disk.  Please see the email that Al sent earlier about the README.file
> 
> Sent from my iPad
> 
> On May 21, 2018, at 9:01 PM, Antonio Leding <tech at leding.net <mailto:tech at leding.net>> wrote:
> 
>> One point of clarification - I have Snort firing off an alert about the file being downloaded and then the packet capture + Wireshark for the follow-on file extraction and analysis.
>> 
>> 
>> 
>>> On May 21, 2018, at 5:50 PM, Antonio Leding <tech at leding.net <mailto:tech at leding.net>> wrote:
>>> 
>>> Not sure if this helps or is relevant but I have always done this using full packet capture + Wireshark.  If there is a way to do this directly in Snort, I would be curious to hear…
>>> 
>>> 
>>>> On May 21, 2018, at 5:48 PM, Hào Tài via Snort-sigs <snort-sigs at lists.snort.org <mailto:snort-sigs at lists.snort.org>> wrote:
>>>> 
>>>> 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 at gmail.com <mailto:haotai1803 at 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
>>>> 
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>>> 
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>>> Visit the Snort.org <http://snort.org/> to subscribe to the official Snort ruleset, make sure to stay up to date to catch the most <a href=" https://snort.org/downloads/#rule-downloads <https://snort.org/downloads/#rule-downloads>">emerging threats</a>!
>> 
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>> 
>> Please visit http://blog.snort.org <http://blog.snort.org/> for the latest news about Snort!
>> 
>> Please follow these rules: https://snort.org/faq/what-is-the-mailing-list-etiquette <https://snort.org/faq/what-is-the-mailing-list-etiquette>
>> 
>> Visit the Snort.org <http://snort.org/> to subscribe to the official Snort ruleset, make sure to stay up to date to catch the most <a href=" https://snort.org/downloads/#rule-downloads <https://snort.org/downloads/#rule-downloads>">emerging threats</a>!

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