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Depending on the specific source, a "checker" tool usually performs one of the following tasks:
: Attackers sometimes bundle a legitimate tool with a "Trojan" that turns your PC into a proxy node or steals your keystrokes.
: ZIP files can hide malicious executables that antivirus software may skip if they are large or password-protected.
: The "checker" itself may be designed to steal the very accounts you are trying to verify. How to Safely Handle This File
: Testing a list of proxy servers to see which are currently online and responsive. Security Risks and Best Practices
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