Depending on the malware quality and setup, it could take more than six months or even a year to discover and contain malware. For instance, AIDS Trojan, the first ransomware, was programmed to start after the infected system was turned on 90 times. A high-quality malware can have long-term consequences. The best proof is Mydoom, a worm that first appeared in 2004. At some point, it was responsible for 25% of all emails sent worldwide. Even now, 17 years later, it still generates around 1% of all phishing emails.