So, to avoid this, the obfuscator code (not seen here) will randomly break up the text into chunks that are difficult for an automated device to piece back together. But, devices can also search for the Base64 values of bad calls. As many stateful inspection devices may block PHP that contains a call of "preg_match", bad guys will normally Base64 encode it. The actual Base64 encoded values are further obfuscated by breaking up the string into multiple segments and rejoining them with the PHP ".". '3J0aW5n' ) resolves to "error_reporting" base64_decode ( 'c'. By hand picking a few of these to test, they all return known PHP function names:īase64_decode ( 'ZXJy'. As each item is called by the code, base64_decode will run on its value and return actual text. The " $GLOBALS" section creates an array of multiple Base64-encoded function values. Each can also be identified as beginning with "". At a high level view, there are three distinct sections to this code block, with the beginning of each underlined in the code above. The initial question was what was contained within all of the Base64 sections, but let's examine this holistically. Round( 0 ),_1348942592( 49 ) => $_8 ) if ( $_9 Īs a fan of obfuscation, this clearly piqued my interest.
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