Function at 0x4020ac
Capabilities:
Allocate or change rwx memory
Check os version
Enumerate pe sections
Execute shellcode via indirect call
Get system information on windows

Disassembly:
push ebp
mov ebp, esp
push eax
mov eax, 4
add esp, 0xfffff004
push eax
dec eax
jne 0x4020b5
mov eax, dword [ebp - 4]
add esp, 0xfffffb4c
push ebx
push esi
push edi
mov eax, dword [ebp + 8]
lea edi, [ebp - 0xa8]
mov dword [ebp - 0x2c], eax
mov esi, 0x490e7a
mov ecx, 8
lea eax, [ebp - 0x43d8]
rep movsd dword es:[edi], dword [esi]
push 0x4330
push 0x4a8a1c
push eax
call fcn.004053c0
add esp, 0xc
lea edx, [ebp - 0xa8]
lea ecx, [ebp - 0x43d8]
push 0x4330
push edx
push 0x64
push ecx
call fcn.0040321c
add esp, 0x10
lea edi, [ebp - 0x43f8]
mov esi, 0x490e9a
mov ecx, 8
lea eax, [ebp - 0x43ba]
rep movsd dword es:[edi], dword [esi]
lea edi, [ebp - 0x4418]
mov ecx, 8
mov esi, 0x490eba
lea edx, [ebp - 0x43f8]
rep movsd dword es:[edi], dword [esi]
push 0x20
push eax
push edx
call fcn.004053c0
add esp, 0xc
cmp byte [ebp - 0x43c7], 0
je 0x40217c
mov ecx, dword [ebp + 0x1c]
push ecx
push 8
push 0x64
lea eax, [ebp - 0x4418]
push eax
lea edx, [ebp - 0x43f8]
push edx
call fcn.0040310c
add esp, 0x14
mov ebx, dword [ebp + 0x10]
cmp ebx, 0xfa000
jle 0x40218c
mov ebx, 0xfa000
push ebx
lea eax, [ebp - 0x43f8]
push eax
push 0x64
mov edx, dword [ebp + 8]
push edx
call fcn.004034f0
add esp, 0x10
mov eax, dword [ebp + 0x10]
sub eax, ebx
cmp eax, 0x9c4000
jbe 0x4021b3
mov eax, 0x9c4000
test eax, eax
jbe 0x4021d3
push eax
lea edx, [ebp - 0x4418]
push edx
mov cx, word [ebp - 0x43bc]
push ecx
add ebx, dword [ebp - 0x2c]
push ebx
call fcn.0040321c
add esp, 0x10
cmp byte [ebp - 0x43c5], 0
cmp byte [ebp - 0x43c6], 0
je 0x402246
mov eax, dword [ebp - 0x43cc]
mov dword [ebp - 0x30], eax
mov edx, dword [ebp + 0x1c]
push edx
push 0x80
push 0x64
mov ecx, dword [ebp - 0x2c]
add ecx, dword [ebp - 0x30]
push ecx
mov eax, dword [ebp - 0x2c]
add eax, dword [ebp - 0x30]
push eax
call fcn.00403160
add esp, 0x14
cmp byte [ebp - 0x4190], 0xa
jb 0x40221f
cmp byte [ebp - 0x4190], 0x20
jb 0x402231
cmp byte [ebp - 0x4190], 0x28
je 0x402231
cmp byte [ebp - 0x4190], 0x8c
jne 0x402246
mov edx, dword [ebp + 0x1c]
push edx
push 0x20
mov ecx, dword [ebp - 0x2c]
add ecx, dword [ebp - 0x30]
push ecx
call fcn.004031b4
add esp, 0xc
mov edi, dword [ebp + 8]
mov eax, dword [edi + 0x3c]
add eax, edi
mov dword [ebp - 4], eax
push 0xf8
mov edx, dword [ebp - 4]
push edx
call sub.KERNEL32.DLL_IsBadReadPtr
dec eax
je 0x40226d
mov ecx, dword [ebp - 4]
cmp dword [ecx], 0x4550
je 0x402274
xor eax, eax
jmp 0x4027c3
mov edx, dword [ebp - 4]
movzx ecx, word [edx + 0x14]
add ecx, dword [ebp - 4]
add ecx, 0x18
mov dword [ebp - 8], ecx
mov dword [ebp - 0x34], 0x28
mov edx, dword [ebp - 4]
mov eax, dword [ebp - 8]
sub eax, edi
movzx ecx, word [edx + 6]
imul ecx, dword [ebp - 0x34]
add eax, ecx
xor edx, edx
mov dword [ebp - 0x28], eax
xor esi, esi
mov eax, dword [ebp - 0x28]
mov dword [ebp - 0x24], eax
mov dword [ebp - 0x38], edx
mov eax, dword [ebp - 8]
lea ebx, [eax + 0xc]
jmp 0x4022d9
mov edx, dword [ebx]
mov eax, edx
add eax, dword [ebx + 4]
cmp eax, dword [ebp - 0x24]
jbe 0x4022c4
mov dword [ebp - 0x24], eax
mov ecx, dword [ebp - 4]
cmp edx, dword [ecx + 0x88]
jne 0x4022d5
movzx eax, si
mov dword [ebp - 0x38], eax
inc esi
add ebx, 0x28
mov ecx, dword [ebp - 4]
movzx edx, si
movzx eax, word [ecx + 6]
cmp edx, eax
jb 0x4022b5
lea edx, [ebp - 0x88]
push edx
call sub.KERNEL32.DLL_GetSystemInfo
mov eax, dword [ebp - 0x24]
xor edx, edx
div dword [ebp - 0x84]
mov dword [ebp - 0x20], eax
mov eax, dword [ebp - 0x24]
xor edx, edx
div dword [ebp - 0x84]
test edx, edx
je 0x402313
inc dword [ebp - 0x20]
mov ecx, dword [ebp - 0x20]
mov eax, dword [ebp + 0x14]
imul ecx, dword [ebp - 0x84]
mov dword [eax], ecx
push 0x40
push 0x1000
mov edx, dword [ebp + 0x14]
mov ecx, dword [edx]
push ecx
push 0
call sub.KERNEL32.DLL_VirtualAlloc
mov dword [ebp + 0xc], eax
cmp dword [ebp + 0xc], 0
jne 0x402359
push 0x10
push 0x490fd0
push str.Error_in_VirtualAlloc
push 0
call sub.USER32.DLL_MessageBoxA
xor eax, eax
jmp 0x4027c3
mov edx, dword [ebp - 0x28]
push edx
mov ecx, dword [ebp + 8]
push ecx
mov eax, dword [ebp + 0xc]
push eax
call fcn.004053e4
add esp, 0xc
xor esi, esi
mov eax, dword [ebp - 8]
lea ebx, [eax + 0xc]
jmp 0x4023ed
mov eax, dword [ebp + 0xc]
add eax, dword [ebx]
mov dword [ebp - 0x3c], eax
mov edx, dword [ebp + 8]
add edx, dword [ebx + 8]
mov dword [ebp - 0x40], edx
mov ecx, dword [ebx + 4]
mov dword [ebp - 0x44], ecx
mov eax, dword [ebp - 0x44]
push eax
mov edx, dword [ebp - 0x40]
push edx
mov ecx, dword [ebp - 0x3c]
push ecx
call fcn.004053e4
add esp, 0xc
mov eax, dword [ebp - 0x44]
push eax
lea edx, [ebp - 0x43ba]
push edx
mov cx, word [ebp - 0x43bc]
push ecx
mov eax, dword [ebp - 0x3c]
push eax
call fcn.0040321c
add esp, 0x10
cmp byte [ebp - 0x43d5], 0
je 0x4023e9
mov edx, dword [ebp - 0x44]
lea ecx, [ebp - 0x43ba]
push edx
push ecx
mov ax, word [ebp - 0x43bc]
push eax
mov edx, dword [ebp - 0x40]
push edx
call fcn.0040321c
add esp, 0x10
inc esi
add ebx, 0x28
mov ecx, dword [ebp - 4]
cmp si, word [ecx + 6]
jb 0x402377
cmp byte [ebp - 0x43d5], 0
je 0x40244c
mov eax, dword [ebp - 0x43d0]
push eax
mov edx, dword [ebp + 0x10]
push edx
mov ecx, dword [ebp + 8]
push ecx
call fcn.004027e8
add esp, 0xc
test eax, eax
jne 0x402441
push 0x8000
push 0
push edi
call sub.KERNEL32.DLL_VirtualFree
push 0x10
push 0x490fe3
push str.Error_in_CCF
push 0
call sub.USER32.DLL_MessageBoxA
xor eax, eax
jmp 0x4027c3
push 0x4a8a1c
call dword [0x4a87e4]
mov edi, dword [ebp + 0xc]
mov eax, dword [edi + 0x3c]
add eax, edi
mov dword [ebp - 4], eax
mov edx, dword [ebp - 4]
add edx, 0xf8
mov dword [ebp - 8], edx
mov dword [0x4a8a00], edi
cmp dword [ebp - 0x38], 0
je 0x402497
call fcn.00402810
dec eax
jne 0x402497
mov ecx, dword [ebp - 0x38]
lea ecx, [ecx + ecx*4]
mov eax, dword [ebp - 8]
mov edx, dword [ebp + 8]
add dword [eax + ecx*8 + 0xc], edx
mov ecx, dword [ebp - 0x38]
lea ecx, [ecx + ecx*4]
mov eax, dword [ebp - 8]
mov edx, dword [ebp + 8]
add dword [eax + ecx*8 + 0x14], edx
mov ecx, dword [ebp - 4]
mov eax, dword [ecx + 0x80]
mov dword [ebp - 0x48], eax
cmp dword [ebp - 0x48], 0
jne 0x4024d0
push 0x8000
push 0
push edi
call sub.KERNEL32.DLL_VirtualFree
push 0x10
push 0x491004
push str.Error_in_GetImgDirEntryRVA
push 0
call sub.USER32.DLL_MessageBoxA
xor eax, eax
jmp 0x4027c3
mov edx, dword [ebp - 4]
mov eax, dword [ebp - 4]
mov ecx, dword [edx + 0x28]
mov edx, dword [ebp + 0x18]
add ecx, dword [eax + 0x34]
mov dword [edx], ecx
mov ecx, dword [ebp - 4]
mov eax, dword [ecx + 0x80]
mov dword [ebp - 0xc], eax
cmp dword [ebp - 0xc], 0
je 0x4024fd
mov edx, dword [ebp - 0xc]
add edx, edi
mov dword [ebp - 0xc], edx
jmp 0x402524
push 0x8000
push 0
push edi
call sub.KERNEL32.DLL_VirtualFree
push 0x10
push 0x491022
push str.Error_in_Get_ImportDesc
push 0
call sub.USER32.DLL_MessageBoxA
xor eax, eax
jmp 0x4027c3
mov edx, dword [ebp - 0xc]
cmp dword [edx + 4], 0
jne 0x40253a
mov ecx, dword [ebp - 0xc]
cmp dword [ecx + 0xc], 0
je 0x4026b9
mov eax, dword [ebp - 0xc]
mov ebx, dword [eax + 0xc]
add ebx, dword [0x4a8a00]
push ebx
call sub.KERNEL32.DLL_GetModuleHandleA
mov dword [ebp - 0x1c], eax
cmp dword [ebp - 0x1c], 0
jne 0x40255e
push ebx
call sub.KERNEL32.DLL_LoadLibraryA
mov dword [ebp - 0x1c], eax
cmp dword [ebp - 0x1c], 0
je 0x4026b0
cmp byte [ebp - 0x43d5], 0
je 0x402621
push 0x491028
push ebx
call sub.KERNEL32.DLL_lstrcmpiA
test eax, eax
jne 0x402621
mov dword [ebp - 0x44ac], 0x94
lea eax, [ebp - 0x44ac]
push eax
call sub.KERNEL32.DLL_GetVersionExA
cmp dword [ebp - 0x449c], 1
je 0x402621
push str.psapi.dll
call sub.KERNEL32.DLL_LoadLibraryA
mov dword [ebp - 0x4c], eax
cmp dword [ebp - 0x4c], 0
je 0x402618
push str.GetModuleInformation
mov edx, dword [ebp - 0x4c]
push edx
call sub.KERNEL32.DLL_GetProcAddress
mov dword [0x4a87d4], eax
push 0xc
lea ecx, [ebp - 0x44b8]
push ecx
mov eax, dword [ebp - 0x1c]
push eax
call sub.KERNEL32.DLL_GetCurrentProcess
push eax
call dword [0x4a87d4]
test eax, eax
je 0x402618
lea edx, [ebp - 0x50]
push edx
push 0x40
mov ecx, dword [ebp - 0x44b4]
push ecx
mov eax, dword [ebp - 0x44b8]
push eax
call sub.KERNEL32.DLL_VirtualProtect
test eax, eax
je 0x402618
mov dl, byte [ebp - 0x43d4]
push edx
mov ecx, dword [ebp - 0x1c]
push ecx
call dword [0x4a87fc]
mov eax, dword [ebp - 0x4c]
push eax
call sub.KERNEL32.DLL_FreeLibrary
mov edx, dword [ebp - 0xc]
mov eax, dword [edx]
test eax, eax
je 0x402630
mov ebx, eax
add ebx, edi
jmp 0x402638
mov eax, dword [ebp - 0xc]
mov ebx, dword [eax + 0x10]
add ebx, edi
mov eax, dword [ebp - 0xc]
mov esi, dword [eax + 0x10]
add esi, edi
jmp 0x4026ab
mov eax, 0x80000000
test dword [ebx], eax
je 0x402661
mov edx, dword [ebx]
and edx, 0xffff
push edx
mov ecx, dword [ebp - 0x1c]
push ecx
call sub.KERNEL32.DLL_GetProcAddress
mov dword [esi], eax
jmp 0x40267a
mov eax, dword [ebx]
add eax, edi
mov dword [ebp - 0x10], eax
mov edx, dword [ebp - 0x10]
add edx, 2
push edx
mov ecx, dword [ebp - 0x1c]
push ecx
call sub.KERNEL32.DLL_GetProcAddress
mov dword [esi], eax
test esi, esi
jne 0x4026a5
push 0x8000
push 0
push edi
call sub.KERNEL32.DLL_VirtualFree
push 0x10
push 0x49106b
push str.Error_in_set_FuncAddr.
push 0
call sub.USER32.DLL_MessageBoxA
xor eax, eax
jmp 0x4027c3
add esi, 4
add ebx, 4
cmp dword [ebx], 0
jne 0x402642
add dword [ebp - 0xc], 0x14
jmp 0x402524
push edi
mov edx, dword [ebp - 4]
push edx
call fcn.00401224
add esp, 8
mov ecx, dword [ebp - 4]
cmp dword [ecx + 0xc0], 0
jbe 0x402757
mov eax, dword [ebp - 4]
mov edx, dword [eax + 0xc0]
add edx, edi
mov dword [ebp - 0x54], edx
mov ecx, dword [ebp - 0x54]
mov edx, dword [ebp - 0x54]
mov eax, dword [ecx + 4]
sub eax, dword [edx]
mov dword [ebp - 0x58], eax
push 4
push 0x1000
mov ecx, dword [ebp - 0x58]
push ecx
push 0
call sub.KERNEL32.DLL_VirtualAlloc
mov dword [0x4a87cc], eax
mov eax, dword [ebp - 0x54]
mov edx, dword [eax]
sub edx, dword [0x4a87d0]
add edx, edi
mov dword [ebp - 0x5c], edx
mov ecx, dword [ebp - 0x58]
push ecx
mov eax, dword [ebp - 0x5c]
push eax
mov edx, dword [0x4a87cc]
push edx
call fcn.004053c0
add esp, 0xc
mov ecx, dword [0x4a87cc]
mov eax, dword fs:[0x2c]
mov dword [eax], ecx
mov ecx, dword [ebp - 0x54]
mov eax, dword [ecx + 8]
sub eax, dword [0x4a87d0]
add eax, edi
mov dword [ebp - 0x60], eax
mov edx, dword [ebp - 0x60]
xor ecx, ecx
mov dword [edx], ecx
cmp byte [ebp - 0x43c4], 0
je 0x402786
mov eax, dword [ebp - 4]
mov edx, dword [eax + 0x80]
add edx, edi
mov dword [ebp - 0xc], edx
mov ecx, dword [ebp - 4]
mov eax, dword [ecx + 0x84]
push eax
push 0
mov edx, dword [ebp - 0xc]
push edx
call fcn.00405430
add esp, 0xc
mov ecx, dword [ebp - 4]
mov eax, dword [ecx + 0xa0]
add eax, edi
mov dword [ebp - 0x14], eax
cmp byte [ebp - 0x43c3], 0
je 0x4027b5
mov edx, dword [ebp - 4]
mov ecx, dword [edx + 0xa4]
push ecx
push 0
mov eax, dword [ebp - 0x14]
push eax
call fcn.00405430
add esp, 0xc
mov edx, dword [ebp + 0xc]
mov eax, 1
mov dword [0x4a8a08], edx
pop edi
pop esi
pop ebx
mov esp, ebp
pop ebp
ret