62 lines
1.1 KiB
NASM
62 lines
1.1 KiB
NASM
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BITS 64
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; https://dennisbabkin.com/blog/?t=how-to-implement-getprocaddress-in-shellcode
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GetKernel32ModuleHandle:
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mov rax, gs:[60h]
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mov rax, [rax + 18h]
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mov rax, [rax + 20h]
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mov rax, [rax]
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mov rax, [rax]
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mov rax, [rax + 20h]
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ret
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GetAddressOf_GetProcAddress:
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mov eax, [rcx + 3ch]
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add rax, rcx
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lea rax, [rax + 88h]
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mov edx, [rax]
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lea rax, [rcx + rdx]
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mov edx, [rax + 18h]
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mov r8d, [rax + 20h]
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lea r8, [rcx + r8]
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mov r10, 41636f7250746547h ; "GetProcA"
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mov r11, 0073736572646441h ; "Address\0"
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.1:
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mov r9d, [r8]
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lea r9, [rcx + r9]
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; Function name comparision
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cmp r10, [r9]
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jnz .2
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cmp r11, [r9 + 7]
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jnz .2
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; Found GetProcAddress
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neg rdx
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mov r10d, [rax + 18h]
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lea rdx, [r10 + rdx]
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mov r10d, [rax + 24h]
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lea r10, [rcx + r10]
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movzx rdx, word [r10 + rdx * 2]
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mov r10d, [rax + 1ch]
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lea r10, [rcx + r10]
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mov r10d, [r10 + rdx * 4]
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lea rax, [rcx + r10] ; Function address
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jmp .end
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.2:
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add r8, 4
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dec rdx
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jnz .1
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.end:
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ret
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