What are the viruses which eat up memory?

Viruses that consume memory are often categorized as memory-resident viruses, which embed themselves in a computer's memory and can replicate and execute while the system is running. Examples include the CMJ and Randex viruses, which can slow down systems by occupying RAM and disrupting normal operations. Additionally, some malware, like certain Trojans or worms, may also increase memory usage by performing malicious activities, leading to degraded system performance. Regular updates and antivirus software can help mitigate these threats.