Function at 0x403b90
Capabilities:
Create process on windows
Write and execute a file
Write file on windows

Disassembly:
push ebx
mov ebx, esp
sub esp, 8
and esp, 0xfffffff8
add esp, 4
push ebp
mov ebp, dword [ebx + 4]
mov dword [esp + 4], ebp
mov ebp, esp
push 0xffffffffffffffff
push 0x41c5bc
mov eax, dword fs:[0]
push eax
push ebx
sub esp, 0x210
mov eax, dword [0x42a018]
xor eax, ebp
mov dword [ebp - 0x14], eax
push esi
push edi
push eax
lea eax, [ebp - 0xc]
mov dword fs:[0], eax
push 0
mov dword [ebp - 4], 1
call fcn.0040c891
add esp, 4
push eax
call fcn.0040c626
add esp, 4
lea eax, [ebp - 0x1f0]
cmp dword [ebx + 0x34], 0x10
lea esi, [ebx + 0x20]
cmovae esi, dword [ebx + 0x20]
push 0x148
push 0
push eax
call fcn.00409780
add esp, 0xc
mov dword [ebp - 0x1e4], esi
mov dword [ebp - 0x1ec], 0x7a120
push 0x7a120
call fcn.00407d41
add esp, 4
mov dword [ebp - 0x1f0], eax
push dword [ebp - 0x1ec]
push 0
push eax
call fcn.00409780
add esp, 0xc
mov dword [ebp - 0x1cc], 0xfde9
mov dword [ebp - 0x1b8], 0
mov dword [ebp - 0x1b4], 0
mov dword [ebp - 0x1b0], 0
mov byte [ebp - 4], 2
lea esi, [ebx + 8]
cmp dword [ebx + 0x1c], 0x10
mov eax, dword [ebp - 0x1c4]
cmovae esi, dword [ebx + 8]
mov dword [ebp - 0x1bc], 0
test eax, eax
je 0x403c9e
push eax
call fcn.00407b01
add esp, 4
mov dword [ebp - 0x1c4], 0
push esi
lea ecx, [ebp - 0x1f0]
call fcn.00401df0
test eax, eax
je 0x404079
cmp dword [ebp - 0x1c8], 0
je 0x404075
mov eax, dword [ebp - 0x1bc]
test eax, eax
je 0x404075
cmp eax, 2
jle 0x404075
cmp eax, 0x800
jle 0x404070
lea ecx, [ebp - 0x60]
call fcn.00403670
mov byte [ebp - 4], 3
cmp dword [ebp - 0x50], 0
je 0x404035
call fcn.0040c605
cdq
mov ecx, 5
idiv ecx
lea ecx, [ebp - 0x220]
add edx, 9
call fcn.00403590
push 1
push 0x4278d4
push ecx
mov ecx, eax
mov byte [ebp - 4], 4
call fcn.004066f0
mov dword [ebp - 0x30], 0
mov dword [ebp - 0x20], 0
mov dword [ebp - 0x1c], 0
movups xmm0, xmmword [eax]
movups xmmword [ebp - 0x30], xmm0
movq xmm0, qword [eax + 0x10]
movq qword [ebp - 0x20], xmm0
mov dword [eax + 0x10], 0
mov dword [eax + 0x14], 0xf
mov byte [eax], 0
mov byte [ebp - 4], 5
lea ecx, [ebp - 0x30]
mov esi, dword [ebp - 0x1c]
mov eax, esi
mov edx, dword [ebp - 0x20]
sub eax, edx
cmp eax, 4
jb 0x403d91
cmp esi, 0x10
lea eax, [edx + 4]
mov dword [ebp - 0x20], eax
cmovae ecx, dword [ebp - 0x30]
mov eax, dword [str..exe]
mov dword [ecx + edx], eax
lea eax, [ebp - 0x30]
mov byte [ecx + edx + 4], 0
jmp 0x403da6
push 4
push str..exe
mov byte [ebp - 0x18], 0
push dword [ebp - 0x18]
push 4
call fcn.00402640
movups xmm1, xmmword [eax]
movq xmm0, qword [eax + 0x10]
movups xmmword [ebp - 0x208], xmm1
mov dword [eax + 0x10], 0
movq qword [ebp - 0x1f8], xmm0
mov dword [eax + 0x14], 0xf
mov byte [eax], 0
mov byte [ebp - 4], 6
lea edx, [ebp - 0x208]
cmp dword [ebp - 0x1f4], 0x10
mov eax, dword [ebp - 0x4c]
mov esi, dword [ebp - 0x50]
mov ecx, dword [ebp - 0x1f8]
movd edi, xmm1
push ecx
cmovae edx, edi
sub eax, esi
push edx
cmp ecx, eax
ja 0x403e25
cmp dword [ebp - 0x4c], 0x10
lea eax, [ecx + esi]
mov dword [ebp - 0x50], eax
lea eax, [ebp - 0x60]
cmovae eax, dword [ebp - 0x60]
add esi, eax
push esi
call fcn.00409140
mov eax, dword [ebp - 0x1f8]
add esp, 0xc
mov byte [eax + esi], 0
lea eax, [ebp - 0x60]
jmp 0x403e3b
mov byte [ebp - 0x18], 0
push dword [ebp - 0x18]
push ecx
lea ecx, [ebp - 0x60]
call fcn.00402640
mov edi, dword [ebp - 0x208]
push eax
lea ecx, [ebp - 0x48]
call fcn.00405850
mov eax, dword [ebp - 0x1f4]
cmp eax, 0x10
jb 0x403e7a
lea ecx, [eax + 1]
mov eax, edi
cmp ecx, 0x1000
jb 0x403e70
mov edi, dword [edi - 4]
add ecx, 0x23
sub eax, edi
add eax, 0xfffffffc
cmp eax, 0x1f
ja 0x404140
push ecx
push edi
call fcn.00407d33
add esp, 8
mov edx, dword [ebp - 0x1c]
cmp edx, 0x10
jb 0x403eae
mov ecx, dword [ebp - 0x30]
inc edx
mov eax, ecx
cmp edx, 0x1000
jb 0x403ea4
mov ecx, dword [ecx - 4]
add edx, 0x23
sub eax, ecx
add eax, 0xfffffffc
cmp eax, 0x1f
ja 0x404140
push edx
push ecx
call fcn.00407d33
add esp, 8
mov edx, dword [ebp - 0x20c]
mov dword [ebp - 0x20], 0
mov dword [ebp - 0x1c], 0xf
mov byte [ebp - 0x30], 0
cmp edx, 0x10
jb 0x403efa
mov ecx, dword [ebp - 0x220]
inc edx
mov eax, ecx
cmp edx, 0x1000
jb 0x403ef0
mov ecx, dword [ecx - 4]
add edx, 0x23
sub eax, ecx
add eax, 0xfffffffc
cmp eax, 0x1f
ja 0x404140
push edx
push ecx
call fcn.00407d33
add esp, 8
cmp dword [ebp - 0x34], 0x10
lea eax, [ebp - 0x48]
cmovae eax, dword [ebp - 0x48]
cmp dword [ebp - 0x1c8], 0
je 0x403f5e
cmp dword [ebp - 0x1bc], 0
je 0x403f5e
push 0
push 0x80
push 2
push 0
push 1
push 0x40000000
push eax
call dword [sym.imp.KERNEL32.dll_CreateFileA]
mov esi, eax
cmp esi, 0xffffffff
je 0x403f5e
push 0
lea eax, [ebp - 0x18]
mov dword [ebp - 0x18], 0
push eax
push dword [ebp - 0x1bc]
push dword [ebp - 0x1c8]
push esi
call dword [sym.imp.KERNEL32.dll_WriteFile]
push esi
call dword [sym.imp.KERNEL32.dll_CloseHandle]
cmp dword [ebp - 0x34], 0x10
lea ecx, [ebp - 0x28]
push ecx
lea ecx, [ebp - 0xa8]
mov dword [ebp - 0xa8], 0x44
push ecx
push 0
push 0
push 0
push 0
xorps xmm0, xmm0
lea eax, [ebp - 0x48]
cmovae eax, dword [ebp - 0x48]
push 0
push 0
push 0
push eax
movlpd qword [ebp - 0xa4], xmm0
movlpd qword [ebp - 0x9c], xmm0
movlpd qword [ebp - 0x94], xmm0
movlpd qword [ebp - 0x8c], xmm0
movlpd qword [ebp - 0x84], xmm0
movlpd qword [ebp - 0x7c], xmm0
movlpd qword [ebp - 0x74], xmm0
movlpd qword [ebp - 0x6c], xmm0
movups xmmword [ebp - 0x28], xmm0
call dword [sym.imp.KERNEL32.dll_CreateProcessA]
test eax, eax
je 0x403fdb
cmp dword [ebp - 0x20], 0xffffffff
jne 0x403ffa
cmp dword [ebp - 0x34], 0x10
lea eax, [ebp - 0x48]
push 0xa
cmovae eax, dword [ebp - 0x48]
push 0
push 0
push eax
push str.open
push 0
call dword [sym.imp.SHELL32.dll_ShellExecuteA]
mov edx, dword [ebp - 0x34]
cmp edx, 0x10
jb 0x40402e
mov ecx, dword [ebp - 0x48]
inc edx
mov eax, ecx
cmp edx, 0x1000
jb 0x404024
mov ecx, dword [ecx - 4]
add edx, 0x23
sub eax, ecx
add eax, 0xfffffffc
cmp eax, 0x1f
ja 0x404145
push edx
push ecx
call fcn.00407d33
add esp, 8
mov esi, 1
jmp 0x40403a
mov esi, 0xfffffffe
mov edx, dword [ebp - 0x4c]
cmp edx, 0x10
jb 0x40407e
mov ecx, dword [ebp - 0x60]
inc edx
mov eax, ecx
cmp edx, 0x1000
jb 0x404064
mov ecx, dword [ecx - 4]
add edx, 0x23
sub eax, ecx
add eax, 0xfffffffc
cmp eax, 0x1f
ja 0x40414a
push edx
push ecx
call fcn.00407d33
add esp, 8
jmp 0x40407e
or esi, 0xffffffff
jmp 0x40407e
xor esi, esi
jmp 0x40407e
mov esi, 0xfffffffd
push dword [ebp - 0x1f0]
call fcn.00407b01
add esp, 4
push dword [ebp - 0x1c8]
call fcn.00407b01
add esp, 4
push dword [ebp - 0x1c4]
call fcn.00407b01
add esp, 4
call dword [sym.imp.ole32.dll_CoUninitialize]
mov edx, dword [ebx + 0x1c]
cmp edx, 0x10
jb 0x4040de
mov ecx, dword [ebx + 8]
inc edx
mov eax, ecx
cmp edx, 0x1000
jb 0x4040d4
mov ecx, dword [ecx - 4]
add edx, 0x23
sub eax, ecx
add eax, 0xfffffffc
cmp eax, 0x1f
ja 0x40414f
push edx
push ecx
call fcn.00407d33
add esp, 8
mov edx, dword [ebx + 0x34]
mov dword [ebx + 0x18], 0
mov dword [ebx + 0x1c], 0xf
mov byte [ebx + 8], 0
cmp edx, 0x10
jb 0x404120
mov ecx, dword [ebx + 0x20]
inc edx
mov eax, ecx
cmp edx, 0x1000
jb 0x404116
mov ecx, dword [ecx - 4]
add edx, 0x23
sub eax, ecx
add eax, 0xfffffffc
cmp eax, 0x1f
ja 0x40414f
push edx
push ecx
call fcn.00407d33
add esp, 8
mov eax, esi
mov ecx, dword [ebp - 0xc]
mov dword fs:[0], ecx
pop ecx
pop edi
pop esi
mov ecx, dword [ebp - 0x14]
xor ecx, ebp
call fcn.00407af3
mov esp, ebp
pop ebp
mov esp, ebx
pop ebx
ret
call fcn.0040c1a7
call fcn.0040c1a7
call fcn.0040c1a7
call fcn.0040c1a7
int3