Budapest Convention and related standards

The Convention on Cybercrime of the Council of Europe (CETS No.185), known as the Budapest Convention, is the only binding international instrument on this issue. It serves as a guideline for any country developing comprehensive national legislation against Cybercrime and as a framework for international cooperation between State Parties to this treaty.
The Budapest Convention is supplemented by a Protocol on Xenophobia and Racism committed through computer systems.

The Budapest Convention (CETS 185)
The Protocol on Xenophobia and Racism (ETS 189)
Guidance Notes

https://www.coe.int/en/web/cybercrime/the-budapest-convention

Council of Europe | Action against Cybercrime
https://www.coe.int/en/web/cybercrime/home