As reported by the National Cyber Security Centre last week, Microsoft has identified a phishing campaign that has been evolving via new techniques to avoid detection by email security filters.
The actor has been modifying email attachments by obfuscating them in various ways to prevent email content filters from identifying and flagging them as malicious.
Microsoft's article shows an evolution of sophistication in techniques used in spear phishing. Spear phishing is a targeted form of phishing, where the message is designed to look like it's from a person the recipient knows and/or trusts.
The NCSC has released guidance on how to defend your organisation from phishing attacks and how to report potential phishing message or scam websites.
Reporting
Report all Fraud and Cybercrime to Action Fraud by calling 0300 123 2040 or online. Forward suspicious emails to report@phishing.gov.uk. Report SMS scams by forwarding the original message to 7726 (spells SPAM on the keypad).