The issue of rootless malicious command overrides is solved by typing the whole path, such as "/bin/sudo".
No, don't do that as a precaution. As others have already answered correctly - it's too late to worry about such things if a malicious agent has write access to your ${HOME} dir.
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No, don't do that as a precaution. As others have already answered correctly - it's too late to worry about such things if a malicious agent has write access to your ${HOME} dir.