Security Fix and security firm Security Fix pulled a reverse denial-of-service (DoS) attack nearly two weeks ago. The attack was using a DoS attacker’s favorite technique against the bad guys. The good guys contacted McColo’s upstream Internet neighbors and explained the situation. McColo was the host provider of choice for many of the world’s largest botnets and bad Web sites. While the 75% drop in spam stayed for nearly a week, it appears that levels are creeping back up fast.”]
Source: https://www.csoonline.com/article/2633091/one-for-the-good-guys.html