To the untrained eye, the script looks and functions exactly like the real product. But beneath the surface, it has been surgically altered—often maliciously. 1. Backdoors & Remote Code Execution (The Silent Killer) The most common modification made by crackers is the insertion of a backdoor . This is a hidden PHP file (e.g., wp-shell.php , shell.php , or named to look like a system file, e.g., image_lib.php ) that allows remote attackers to execute commands on your server.
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A: Your friend is not a security researcher. Unless he personally reviewed every line of obfuscated PHP code (unlikely), it is almost certainly not clean. To the untrained eye, the script looks and