On the eve of Independence Day, a notorious APT group, REvil, executed a massive ransomware attack exploiting a zero-day vulnerability in Kaseya VSA software. This sophisticated supply chain compromise struck over 1,500 businesses in one fell swoop. Trainees will delve into the intricacies of this attack, from the initial infiltration to the decryption key acquisition, and explore the $70 million ransom demand that held global businesses at ransom.