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Almost 80 percent of those recidivists launched more than one attack type. Over time, the most common
attack combinations were

 50 percent of web attackers also attempted sophisticated exploit attacks
 44 percent of malicious scanners were also spam sources
 24 percent of hosts trying to exploit other systems were identified as part of larger botnets
 20 percent of infected proxies were used to run malicious scans

Botnets are created with the goal of critical mass; the bigger the botnet, the more damage it is capable
of doing. Botnets are created by infecting a system, it could be a server, laptop, or webcam, with some
type of malware-- but cyber criminals have learned a few things in the past few years:

31 NSFOCUS 2018 H1 Cybersecurity Insights report, 2018, page 5.

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