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This is not the first time I've heard of checkpoints being used to distribute malware. In fact, I've heard this was a popular vector from shady international groups.

I wouldn't expect this from Bilibili's Index Team, though, given how high profile they are. It's probably(?) a false positive. Though I wouldn't use it personally, just to be safe.

The safetensors format should be used by everyone. Raw pth files and pickle files should be shunned and abandoned by the industry. It's a bad format.

I wonder if the entropy of model weights and their size causes statistical false positives to appear often?

I imagine it has more to do with whether or not the file appears to have executable python code in it, as a .pth file is usually just a a pickled python object and these can be manipulated to load arbitrary python code when loaded.

Disty of SD.Next has made a version in diffusers format.

https://huggingface.co/Disty0/Index-anisora-5B-diffusers

For the record, the dev branch of SD.Next (https://github.com/vladmandic/sdnext) already supports it.

thanks