[AusNOG] Disturbing new spam trend?

[Ben Hohnke]

If the compromised spam host was using a dodgy DNS server, couldn't this
happen? Dodgy DNS servers are pretty common in the malware world AFAIK.

On Wed, Oct 7, 2015 at 9:36 AM Ross Wheeler <ausnog at rossw.net> wrote:

>
> I know spoofed headers have been around (almost) forever, but I had a call
> from a friend this morning who had received some malware.
>
> On looking through the headers, I noticed something that I find a little
> disturbing if I'm interpreting it right:
>
>
> Received: from ali-syd-1.albury.net.au (208.117.108.170) by
> BN1BFFO11FD024.mail.protection.outlook.com (10.58.144.87) with Microsoft
> SMTP Server (TLS) id 15.1.286.14 via Frontend Transport; Tue, 6 Oct 2015
> 10:43:53 +0000
>
> I suspect this may be a forged header, because I couldn't connect to
> 10.58.144.87 (even if BN1BFFO11FD024.mail.protection.outlook.com resolved
> to a 10.x address) - but I suppose it would be possible the mail server
> could be behind NAT, and report its own internal IP...
>
> The thing is, ali-syd-1.albury.net.au is NOT 208.117.108.170
>
> 208.117.108.170 is (currently) showing as another host:
> 170.108.117.208.in-addr.arpa domain name pointer mail.stridersports.com.
>
> Are spammers now getting sufficiently "crafty" to be changing PTR records
> to assist with the delivery of their spam and malware, or am I just being
> paranoid?
>
> (Has anyone else noticed this, or is it something you'd only notice if you
> were specifically looking for it?)
>
> R.
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