ENISA study looks at reliability of botnet size estimates. Total annual global economic loss attributed to malicious software activities is estimated at more than US$ 10 billion. Authors say existing approaches to measuring the size of botnets are often wildly off-base because there is a high incentive for exaggeration. The number of infected machines alone is an inappropriate measure of the threat, they say. The size of a botnet is only one way to factor the threat it poses, says the editor of the report.”]
Source: https://www.csoonline.com/article/2127463/botnets–size-isn-t-everything–says-new-report.html