RE: Strange SMTP sessions with 'helo=<large negative number>' syntax

  Little-endian versus big-endian?  There's no end to the
possible bugs....

Dave
 

> -----Original Message-----
> From: Michel Arboi [mailto:[email protected]] 
> Sent: Thursday, December 29, 2005 1:01 AM
> To: max
> Cc: [email protected]
> Subject: Re: Strange SMTP sessions with 'helo=<large negative 
> number>' syntax
> 
> On 28/12/05, max <[email protected]> wrote:
> > to=<[email protected]> proto=SMTP 
> > helo=<-1217882552> Notice that helo section is a negative number 
> > (which is why my postfix rejects the message)
> 
> Spammers sometimes hide IP addresses (in URL) by using a 32 
> bits integer. And also that they often use buggy tools.<grin> 
> Maybe they tried to use this trick in the HELO command?
> 
> -1217882552+2^32 = 3077084744 = 183.104.150.72
> -1218008120+2^32 = 3076959176 = 183.102.171.200
> Both addresses seems to be unassigned, my hypothesis looks wrong :-(
> 
> > Has anyone noticed this as well?
> 
> I don't have this in my logs.
>