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What is the XSSAttack option_name for in the options table?

I am working on eliminating malware from a site and reviewed the entries in the options table. Found an "option_name" of XSSAttack with an "option_value" of 1.

Lots of searches on google and on the WordPress.org site as well as others. Cannot find any information on this.

Is it something I should leave there, or is it something entered by malware?