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Can a malware occupy memory without getting noticed by or displayed in "Windows Task Manager"? How can we detect such malware, if any? Can you give examples of such malware?
I would assume (I'm not very knowledgeable on the subject) that it cannot escape the Processes tab but it may not appear in the Programs tab or appear in Processes under a faked name. If you sort the menu by memory usage, you can easily see it if it is using a high amount in relation to other ones . As for your second question on how it can be detected , maybe with Windows Defender (on Win10) ? Disclaimer : This is all speculation
Technically speaking, like viruses, malware can attach itself to other programs. In order to do so, it must run as administrator, something that won't happen easily nowadays anymore, so most malware runs as a standalone process, usually with a random name.
Processes
tab but it may not appear in thePrograms
tab or appear inProcesses
under a faked name. If you sort the menu by memory usage, you can easily see it if it is using a high amount in relation to other ones . As for your second question on how it can be detected , maybe with Windows Defender (on Win10) ? Disclaimer : This is all speculation