Spammers are always looking for creative ways to bypass spam filters. As a spammer, one of the problems with creating your own architecture to deliver mail is that, once the spam starts flowing, these sources (IPs/domains) can be blocked. Spam can more easily find its way into the inbox if it is delivered from an unexpected or legitimate source. Realizing this, many spammers have elected to attack web pages and mail servers of legitimate organizations, so they may use these “pirated” resources to send unsolicited email.
There are many ways spammers accomplish this task: One is to abuse web pages connected to backend SMTP infrastructure, and another uses breached email/password credentials to try and log into email accounts they can use to send spam. Cisco Talos has new research that explores both styles of attack and delves into some of the tools used by spammers.
Web form abuse
The HTML
tag was released with HTML version 2.0, nearly 30 years ago. Since then, spammers have found creative ways to abuse web forms. The lack of proper input validation left many of these forms open to manipulation by attackers. Over time, these HTML form attacks bec ..Support the originator by clicking the read the rest link below.