[Bro] Error when extracting URLs from email traffic
Derek Banks
itsecderek at gmail.com
Tue Jul 8 09:43:32 PDT 2014
Hello Bro list,
I am attempting to write a script to extract URLs from SMTP. The script
below is my starting point and it seems to work pretty well except that I
am getting an error occasionally on some of the connections. The end goal
(and I am a ways away atm) is to eventually get the URLs fed into the intel
framework to attempt to alert on potential spearphishing.
Script:
@load base/frameworks/intel
@load base/utils/urls
@load ./where-locations.bro
event file_over_new_connection(f: fa_file, c: connection, is_orig: bool)
{
const mail_servers = { 192.168.50.72, 192.168.50.75 };
if ( c$id$orig_h !in mail_servers )
return;
if ( ! f?$conns )
return;
if ( f$source != "SMTP" )
return;
if ( ! f?$bof_buffer )
return;
for ( cid in f$conns )
{
local urls = find_all_urls_without_scheme(f$bof_buffer);
for ( url in urls )
{
print fmt(url);
}
}
}
The error is:
1404827445.346519 error in ./extract_urls_in_email_v1.bro, line 38: too few
arguments for format (fmt(url) and <redacted URL>
Does anyone know what might be causing this error?
Best Regards,
Derek
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