The virusChecker software for OS X is a fake application that claims to check computers for viruses, but in reality is a fraudulent software.
Unfortunately, virusChecker's effectiveness as an antivirus program is dubious at best. It doesn't actually check for viruses, which makes its purported function misleading. Instead, virusChecker only focuses on checking the files in your system and keeps you up-to-date about its progress.
So, if you really need a reliable antivirus software to keep your Mac secure, virusChecker might not be your best bet. But, for users who just want a low-maintenance command-line script to provide a basic level of security, virusChecker could be an option to consider.