Fuego Elite is a kernel module for Microsoft Windows XP that provides the ability to draw boxes around any player in Counter-Strike 1.6.
To achieve that it patches the System Service Descriptor Table (SSDT) and hooks NtGdiExtEscape, which is called during redraw in Counter-Strike, to access memory and draw the boxes using NtGdiSetPixel. Offsets for the player information are retrieved dynamically using pattern matching.
Please note that this software is only a Proof of Concept (POC). You will need the HLSDK to compile.
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