Thread:Project:Support desk/Still getting User spam even after disabling registration/reply (6)

Ok, if that is all, it does not look like a hack, but just like "ordinary" spam.

Yes, there for example is the extension Deleteuser. However, this may damage your database. Better would be User Merge and Delete, which also allows you to remove user accounts. You just have to merge them to "no account", which will remove them.