Around 1 o'clock in the morning, just finished watching a replay of a game of Kings of Glory, and was about to go on QQ to chat before going to bed. Unexpectedly, when I logged into QQ, I saw that I had inexplicably sent a DOC file to a friend.
Immediately, I changed my QQ password and enabled device lock. I tried to download that DOC file, but it was blocked by the Windows 10 firewall. After that, I checked the login IP, and it was the same as my local IP.
After some research, I think someone used QQkey to log into my QQ account and send a virus file to someone else. I will take the virus file to a virtual machine to check it when I have time.
Virus file: https://share.weiyun.com/5rG26i5
I heard that clicking on it will result in account theft, but I don't know what kind of black technology it is. I also don't know how they checked my usual login location, and the login IP is also in Guangzhou.
Update 2019.12.16
Suddenly, I found out that the login IP is my own server, which has been used for QQ boosting for a few years. This is the first time something like this has happened... Turns out there was a backdoor.