https://www.trendmicro.com/vinfo/us/security/news/cybercrime-and-digital-threats/malicious-spam-campaign-uses-iso-image-files-to-deliver-lokibot-and-nanocore
A malicious spam campaign conducted in April used ISO image files to deliver the notorious LokiBot and NanoCore trojans.
iso imagemaliciousspamcampaignuses