The UK’s National Cyber Security Centre (NCSC) – a part of GCHQ – has warned that hackers based in Russia and Iran are conducting increased spear-phishing attacks.

Spear-phishing involves sending a malicious electronic communication to get someone to download malware or hand over sensitive information.

The attacks are often highly targeted to make it appear like the communication is from a loved one, friend, colleague, or business that the target knows and...