There are several issues that resemble clipboard malware problems but may have different causes. I want you to know about them before your conclude that you are having a clipboard malware on your system.
The first of these issues is that when you install a clipboard manager, it can affect the normal clipboard functions on your computer. So, if you notice abnormal behavior when using CTRL-C and CTRL-V, it may not be malware but rather a clipboard management software issue.
Before you exclaim "Malware," check and ensure that your computer is free of bugs, as bugs can be one of the culprits. The solution here is to restart the computer. If the issue persists, then we can conclude it is malware.
You may have different software that is installed on your computer that could also affect how the clipboard functions. To resolve this issue, you either update or uninstall any recent software you suspect may cause the issue.
Furthermore, if you have a browser extension designed to assist in copy and paste, it may be interfering with clipboard operations. Ensure you uninstall them to resolve the issue.
In addition, sometimes certain faulty hardware components in your computer may manifest as clipboard issues. I recommend running hardware diagnostics to identify the problem.
There are rare cases where you may start to have clipboard issues after you updated the operating system of your computer. It could be that the some settings changed. You should check your settings to ensure that they are correctly configured.
This may not be as encompassing but you get the point. If the problem persists, then read through LoyceV,
How to lose your Bitcoins with CTRL-C CTRL-V for help.