Hackers are targeting Windows machines using the ZIP file concatenation technique to deliver malicious payloads in compressed archives without security solutions detecting them. [...]
source https://www.bleepingcomputer.com/news/security/hackers-now-use-zip-file-concatenation-to-evade-detection/
source https://www.bleepingcomputer.com/news/security/hackers-now-use-zip-file-concatenation-to-evade-detection/