The National Cyber Security Centre – in association with partners – has issued an advisory about an Iranian state sponsored hacking group “MuddyWaters”.
Joint advisory on MuddyWater actor – NCSC.GOV.UK
If you are interested in some of the background and how these type of nation backed groups operate the article by the US Cybersecurity and Infrastructure Security Agency (CISA) is worth a read. However the big thing I got from the report which I have shared above is the advice CISA puts at the top of the page.