Chinese LuoYu Hackers Using Man-on-the-Side Attacks to Deploy WinDealer Backdoor

An "extremely sophisticated" Chinese-speaking advanced persistent threat (APT) actor dubbed LuoYu has been observed using a malicious Windows tool called WinDealer that's delivered by means of man-on-the-side attacks. "This groundbreaking development allows the actor to modify network traffic in-transit to insert malicious payloads," Russian cybersecurity company Kaspersky said in a new report.