Microsoft warns of new signed malware that implements remote monitoring tools as backdoors

• Microsoft warns of phishing campaigns with fake conferencing tools
• Malware disguised using valid digital certificates
• Broad enterprise targeting with persistent backdoor risk

Microsoft is warning of a new phishing campaign that aims to install persistent backdoors onto victim computers.

In a new in-depth analysis, the company’s researchers said they have recently seen several phishing campaigns, currently not attributed to any known threat actors, sending emails with weaponized PDF files (financial documents, invoices), fake meeting invitations or organizational messages.