Counter:Side decrypt

[luke927]

So the game is called Counter:Side and it has both mobile and PC version.
Some sample files in the link below:
https://drive.google.com/drive/folders/ ... sp=sharing

According to the analysis from a blog post (https://blog.palug.cn/2966.html), the file should be xor encrypted, and the key is B732691C659E9B53E17C152C75FEE281A742482298CBC50C7C883A8DB355B661
The first 212 bytes were encrypted.

But when I was using the key to do the decryption, only a small portion of the files can be decrypted correctly and parsed by AssetStudio.

Other files either has the error such as lz4 block is corrupted, or invalid length has been given.

Can anyone help? The decrypt algorithm seems not just simply xor with key rotation.

Much appreciated!

[gef48]

attach the file, I tested the blog exe and everything went as it should