Most is malware these days. Checkout Safing Portmaster and config blocking various outbound connections and pick a good DNS filter like AdGuard. Then if you get malware it won't be able to connect to CnC server.
Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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You don't need an antivirus with Linux.
Avast! runs on Linux.
Personally I prefer to just avoid clicking on dodgy links. In the last 5 years I haven't found any viruses. YMMV
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Dr Web for linux. Run it once a week.