After staying relatively quiet for the large part of the year, Necurs, the world's largest spam botnet, has sprung back to life this summer. Most recently, researchers from Proofpoint and Cofense have independently observed the botnet launching large waves of malicious emails primarily targeting banks and other financial institutions.
Article Link: https://blog.barkly.com/necurs-botnet-banks-iqy-pub-file-campaigns-2018