At present, Emotet Trojan is the biggest threat of malware. His aggressiveness has increased over the years. Until now, Emotet was limited and operated only on computers and servers on the same network. However, security researchers have published that the Emotet module may, in some circumstances, overcome the WiFi vulnerability to other nearby systems. The new WiF module is spreading due to weak user passwords, but also opens a new vector that infects companies. The range is increasing.

https://www.zdnet.com/article/emotet-trojan-evolves-to-spread-via-a-wifi-connection/