Additional info to the terms beginning with: hy

Hybrid malware

Hybrid malware (combo malware), is a combination of two or more different types of attacks, like a Trojan horse or worm with adware or malware attached. It typically combines several malware families together to perform a complex attack. Hybrid malware can also act like a bot, aiming at making infected machines part of a botnet. Once the infected machines are connected to the botnet, hackers can rent them out to other threat actors. Hybrid malware may also combine a virus's ability to alter program code and stay resident in memory and it can have the ability to propagate without any action on the part of a user.

Hypercard virus

MerryXmas!

Some recources claim that this was the first hypercard virus, actually: that's not the case (Dukakis was the first, in 1988), but it was very well-known and stayed around for years. MerryXmas was released in 1991, (written in Hypertalk-language).
When an infected stack was opened, the virus script copied itself to the Home stack. From there, it spread to every other stack that was opened. In 1991 it was also able to infect a Mac-pc.
This type of viruses can cause unexpected Home stack behavior. They can shut the system down without saving open files and display messages and plays sounds. Hypercard-viruses are known to often have many variants (with totally different names) and were hard to get rid of.

Additional information (hy)

Hybrid malware

Hypercard virus

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