Call Trick

Created the Saturday 23 March 2019. Updated 3 years, 6 months ago.

This technique relies on changing the default function’s return address. In conjunction with other techniques such as Garbage Bytes, this trick may break all kind of disassemblers. Recursive traversal disassemblers may disassemble the next instruction after the CALL, but the correct next instruction was actually changed by the called function. After the CALL and before the next executed instruction, other anti-disassembly techniques, such as Garbage Bytes, can be used. Linear sweep is also affected because they do not interpret instructions and may also disassemble the next instruction after the call, getting vulnerable to other anti-disassembly techniques such as Garbage Bytes.

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