Most antivirus scanners play a classic cat and mouse game: They work by checking software against a frequently updated list of potential threats. In response, a whole industry has built up to help occlude and conceal hacking tools. That includes services that automate the process of checking all sorts of tools, from malware to malicious URLs, against dozens of defense scanners to see if they would get blocked. The feedback helps bad actors know what to tweak further, and whats ready to use.
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