Actually its a China game. Made by some Chinese software company called "Kingsoft".

Game/Mod/Application Mission Against Terror
Type First-Person, Shooter
Publisher Kingsoft
Developer Kingsoft

Description MISSION AGAINST TERROR (MAT) is an FPS game developed by Kingsoft Dalian JingCai Studio. Originally developed in China, MAT delivers an exciting online tournament experience. By integrating aspects of traditional Chinese culture, MAT provides an exhilarating local element for Asia and for worldwide players. Beyond the key elements of an FPS game, MAT also provides unique weapons, specially designed maps, different gaming modes, and customizable equipment.


If I remember correctly the company also make antivirus solutions. I remember various people saying they make very subpar softwares