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MailScanner not working properly

Posted: 16 Aug 2016 13:22
by bostjanc
Hi guys.
Using EFA (latest version).
MailScanner is not inspecting URL's ok in docs.google.com case.

If I sent this link to a user which is behind EFA, mailscanner complaints about being fraud:
https://docs.google.com/spreadsheets/d/ ... sp=sharing

but it seems irrasonable to do that.
We have tried with changing mailscanner conf file settings:
We have changed "Use Stricter phishing net" to NO, but still hyperlinks with docs.google.com are being treated by mailscanner a potentially FRAUD.

Is it a bug or is it a feature?

MailScanner has detected definite fraud in the website at "docs.google.com". Do not trust this website: https://docs.google.com/spreadsheets/d/ ... sp=sharing

Thanks, with best regards

Re: MailScanner not working properly

Posted: 16 Aug 2016 14:07
by ovizii
well, if you click the link, where does it take you?

Re: MailScanner not working properly

Posted: 16 Aug 2016 14:42
by bostjanc
Hi.
Thank you for your reply.

If I click on link it takes me to:

https://docs.google.com/spreadsheets/d/ ... edit#gid=0

But it's the same even if I sent this hyperlink in the message, mail scanner will "false-positive" complain again.

MailScanner has detected definite fraud in the website at "docs.google.com". Do not trust this website: https://docs.google.com/spreadsheets/d/ ... edit#gid=0

Re: MailScanner not working properly

Posted: 17 Aug 2016 05:48
by bostjanc
anyone please help

Re: MailScanner not working properly

Posted: 17 Aug 2016 06:26
by ovizii
I can't help you much except show you what Mailscanner considers phishing:

https://www.mailscanner.info/MailScanne ... .html#Find Phishing Fraud
https://www.mailscanner.info/MailScanne ... x.html#Use Stricter Phishing Net

maybe add docs.google.com to the safe domains? => https://www.mailscanner.info/MailScanne ... l#Phishing Safe Sites File

apart from that the only reason I can think of this to happen is if you are sending shortened links? aka goo.gl/123 which then redirect to docs.google.com or links where the link text is a different URL than the actual link?

Re: MailScanner not working properly

Posted: 17 Aug 2016 09:06
by bostjanc
Hi there.
Thank you for your reply.
But in this case the link text and the URL are same.
Why is then this considered as fraud if the text and URL are the same?
adding googledocs to trusted domain can be a nasty (from security perspective) workaround...
With best regards

Re: MailScanner not working properly

Posted: 17 Aug 2016 09:24
by ovizii
I've emailed you asking you to send me an email with that link to see what my EFA appliance makes of it.

Re: MailScanner not working properly

Posted: 17 Aug 2016 09:44
by bostjanc
Thanks for the email.
message was sent.
With best regards

Re: MailScanner not working properly

Posted: 17 Aug 2016 09:48
by ovizii
So I had the exact same results:
MailScanner has detected definite fraud in the website at "docs.google.com". Do not trust this website: https://docs.google.com/spreadsheets/d/ ... edit#gid=0
but the mistery is solved. Looking into: /etc/MailScanner/phishing.bad.sites.conf and I see: docs.google.com

This is a bit of a concern, any official way to solve this?

Re: MailScanner not working properly

Posted: 17 Aug 2016 11:02
by bostjanc
Nice to found the root of the problem...
So what are the best practices regarding that?
With best regards

Re: MailScanner not working properly

Posted: 17 Aug 2016 11:08
by ovizii
as a workaround, I'd delete the url in there but it seems its being updated daily.

Not sure where to address this, some official MailScanner forum maybe?

Re: MailScanner not working properly

Posted: 17 Aug 2016 11:46
by DaN
https://github.com/MailScanner/v5/searc ... sites.conf

You could try /etc/MailScanner/phishing.safe.sites.conf, oh a moment...

it's in there

with a *.google.com

you could try to write docs.google.com to /etc/MailScanner/phishing.safe.sites.conf and see who's winning

Re: MailScanner not working properly

Posted: 17 Aug 2016 11:48
by bostjanc
Maybe deleting that line with crontab :)

Re: MailScanner not working properly

Posted: 17 Aug 2016 11:56
by ovizii
I read somewhere that BAD trumps SAFE.
So manually deleting from BAD is the way to go.

couldn't find anything via Google as to why its in there in the first place. seems there was a wave of phishing attacks in 2014 but nothing current...

Re: MailScanner not working properly

Posted: 17 Aug 2016 12:04
by bostjanc
I've read some "same articles" that google went "wild" in the past (with phishing) :P

Re: MailScanner not working properly

Posted: 18 Aug 2016 08:17
by bostjanc
For the conclusion, so what is the best approach for fix this?
With best regards

Re: MailScanner not working properly

Posted: 18 Aug 2016 12:41
by bostjanc
FYI
Posted my question also on mailscanner forum:
https://forum.configserver.com/viewtopi ... =19&t=9696

Re: MailScanner not working properly

Posted: 19 Aug 2016 08:23
by bostjanc
It wasn't the "right forum".
Tried my luck also here:
http://forum.mailcleaner.org/viewtopic.php?f=12&t=2400

Re: MailScanner not working properly

Posted: 19 Aug 2016 08:49
by ovizii
I think the right place would be going to https://www.mailscanner.info/ then checking under SUPPORT )
You can either use the mailing list: http://lists.mailscanner.info/listinfo/mailscanner
(or possibly the issue tracker: https://github.com/MailScanner/v5/issues=

Re: MailScanner not working properly

Posted: 19 Aug 2016 11:22
by bostjanc
Thanks for the hint.
I have submitted the issue:
https://github.com/MailScanner/v5/issues/14

Re: MailScanner not working properly

Posted: 19 Aug 2016 14:13
by jbenton
I love the title of this post.

Add your custom edits to the .custom file for each respective list. The build script merges the values. If your site is in the safe sites, the bad sites will not fire if the same host (domain) is present in both files. Wildcards do not work and from a security standpoint would be a bad idea anyway. If you are using MailScanner v4, then you need to update to MailScanner v5.

Read this to get a general idea of how the phishing sites is built: http://phishing.mailscanner.info/

Read this to get a general idea of how the safe sites is built: http://phishing.mailscanner.info/update_phishing_sites

Read line 7315: https://github.com/MailScanner/v5/blob/ ... Message.pm


Posting bug reports on github is for ... well .... bugs. If you have a MailScanner question, please use the MailScanner mailing list.

Jerry Benton

Re: MailScanner not working properly

Posted: 19 Aug 2016 22:16
by shawniverson
Milestone 3.0.1.2 Status (includes MailScanner v5):

https://github.com/E-F-A/v3/milestone/15

I'll try to wrap up commits this weekend and get this out to beta.

Re: MailScanner not working properly

Posted: 21 Aug 2016 12:49
by bostjanc
thanks. keep up the good work!

Re: MailScanner not working properly

Posted: 24 Aug 2016 14:10
by bostjanc
shawniverson any news on new build yet?
with best regards

Re: MailScanner not working properly

Posted: 25 Aug 2016 21:17
by shawniverson