Be wary of Ransomware.
Ransomware is a growing problem and lawyers especially have been targeted in recent years. Prevention is the best cure when it comes to hacking attacks so ensuring one has a managed IT service provider who are competent with security is a must.
It's also necessary to ensure staff are cognisant of the fact that links and attachments in emails can contain dangerous malware so one should only engage with such correspondence if one is certain it is from a trustworthy source. If one wishes to check the safety of an email, having an IT expert open it in a "sandbox" environment where it can be tested is a must.