Here's an article I found on that: https://www.khanacademy.org/science/ap-biology/natural-selection/common-ancestry-and-continuing-evolution/a/evolution-of-viruses
The key takeaways are:
    - Viruses undergo evolution and natural selection, just like cell-based life, and most of them evolve rapidly.
    - When two viruses infect a cell at the same time, they may swap genetic material to make new, "mixed" viruses with unique properties. For example, flu strains can arise this way.
    - RNA viruses have high mutation rates that allow especially fast evolution. An example is the evolution of drug resistance in HIV.

So, yes, they do undergo evolution in the same way that any other creature evolves, including other viruses.
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