Avaddon ransomware has been spreading this week via an old technique that’s making a comeback, Microsoft cautions on Thursday. The attacks appear to be more targeted and rely on malicious Excel 4.0 macros to download the malware directly on the system. Microsoft noticed an increase in malicious email campaigns with Excel macros over the past few months. A sample analyzed by BleepingComputer asked for a ransom of $900. The encryption routine is solid and files cannot be unlocked for free. The malware emerged at the beginning of June, delivered “with a wink and a smile”””
Source: https://www.bleepingcomputer.com/news/security/avaddon-ransomware-shows-that-excel-40-macros-are-still-effective/