Apple recently updated XProtect, the software built into macOS that protects the operating system from viruses and malware. The update, version 2166, was issued on February 22, and was installed automatically, which is the usual method for XProtect.  A recent blog post by Howard Oakley points out the new version, and although Apple doesn’t issue security notes about the update, Oakley says that XProtect was updated with new Yara definitions for two exploits, MACOS.KEYSTEAL.A and HONKBOX_A, B, and C.
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