This is a very basic explanation of the different file format structures and how does the different encryption methods used by Silent_Packer work.

ELF

In computing, the Executable and Linkable Format (ELF, formerly named Extensible Linking Format), is a common standard file format for executable files, object code, shared libraries, and core dumps.

ELF Structure

ELF Code cave

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ELF Section Insertion

ELF Silvio Text Infection

PE

The Portable Executable (PE) format is a file format for executables, object code, DLLs and others used in 32-bit and 64-bit versions of Windows operating systems. The PE format is a data structure that encapsulates the information necessary for the Windows OS loader to manage the wrapped executable code.

PE Structure

PE Code Cave

PE Section Insertion

TODO