"Free AV as sole corporate malware defense is not an industry best practice," Chuvakin said.
Nevertheless, it's not unusual to find Malwarebytes in corporate environments, Peter Firstbrook, an analyst for Gartner, said.
"Malwarebytes is often in use in our big enterprise customers, but mostly for malware removal rather than a first line of defense," he said. "More traditional AV players like Symantec, McAfee, Trend Micro, Kaspersky and Sophos are more common."
In terms of being able to catch malware, free versions of AV software is often as effective as paid versions from the same vendor, because the signatures are the same.
"When it comes to free antivirus versus paid, it comes down to features the user wants, administration capabilities and frequency of updates," Candis Orr, senior security analyst for consulting firm Bishop Fox, said. "An enterprise level antivirus that one has to pay for will have all these features, while a free antivirus will be lacking in one or more areas."
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