[Bro] SSH brute-force email notice

[Seth Hall]

Email sending is automatically disabled if you are reading from a PCAP.  It only works when live traffic is being read.  I believe this was originally intended to avoid people hammering themselves with email on accident when analyzing a PCAP.

  .Seth

> On Feb 28, 2017, at 12:31 PM, Loris Leiva <loris.leiva at gmail.com> wrote:
> 
> So I have done more tests and here are my findings.
> 
> First of all, I added the Notice::policy hook so that every notice gets sent via email (in order not to worry about accepting the right type of notice). Then I tried different ways to launch the `ssh.pcap` with bro.
> 
> - `broctl process ssh.pcap -C` => outputs the notice with ACTION_EMAIL but does not send the email (no stderr.log nor email log).
> - `bro -r ssh.pcap local "Site::local_nets += { … }" -C` => same output, no emails.
> 
> However, if I just start bro via broctl and let it run, I start receiving random notices via emails regarding my laptop’s connections. I haven’t been able to reproduce a SSH brute-force attack but I assume it would work that way.
> 
> So I am starting to wonder if the commands `bro` and `broctl process` are actually able to send emails. Any ideas on that ?
> 
> Thanks in advance for your help,
> Loris
> 
> 
> 
> On 28 Feb 2017, 17:27 +0100, Loris Leiva <loris.leiva at gmail.com>, wrote:
>> Yes sorry I meant no errors get logs but weirdly I still get my notice.log entry with Notice::ACTION_EMAIL in it.
>> 
>> On 28 Feb 2017, 17:24 +0100, Azoff, Justin S <jazoff at illinois.edu>, wrote:
>>> 
>>>> On Feb 28, 2017, at 11:17 AM, Loris Leiva <loris.leiva at gmail.com> wrote:
>>>> 
>>>> Thank you for your answer.
>>>> 
>>>> I have checked the logs during my scenario and when the email doesn’t send nothing get logs at all (not even on the bro stderr log). However, when I raise a dummy notice in a bro_init() event, then I receive the email and the email gets logged properly.
>>> 
>>> Nothing gets logged at all? not even to notice.log?
>>> 
>>>> 
>>>> Note that I am using macOS Sierra so I access my logs through the following command `log stream --predicate '(process == "smtpd") || (process == "smtp")' -info`.
>>>> 
>>>> Any idea of what could be the problem ?
>>>> 
>>>> Thanks again,
>>>> Loris
>>> 
>>> --
>>> - Justin Azoff
>>> 
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--
Seth Hall
International Computer Science Institute
(Bro) because everyone has a network
http://www.bro.org/