It is abnormal if more than a dozen rundll32.exe appear on your computer and occupy a lot of memory. Solution:

Some viruses often disguise themselves as RUNDLL32.exe to infect the computer, and many anti-virus software mistakenly think it is a normal program running on the system and ignore it.

So press CTRL+ALT+DEL to open the Task Manager and see how many megabytes of memory it occupies and how much CPU resources it occupies.

If it takes up more than 20M and the CPU takes up more than 50%, please right-click to end its operation. It must be a virus.