Function at 0x4034c5
Capabilities:
Accept command line arguments
Check os version
Copy file
Delete file
Get common file path
Get file system object information
Set current directory
Set environment variable
Shutdown system
Terminate process

Disassembly:
sub esp, 0x2d4
push ebx
push esi
push edi
push 0x20
pop edi
xor ebx, ebx
push 0x8001
mov dword [esp + 0x14], ebx
mov dword [esp + 0x10], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x1c], ebx
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_GetVersion]
and eax, 0xbfffffff
cmp ax, 6
mov dword [0x434f0c], eax
je 0x403515
push ebx
call fcn.00406806
cmp eax, ebx
je 0x403515
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406796
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x40351a
push 0xb
call fcn.00406806
push 9
call fcn.00406806
push 7
mov dword [0x434f04], eax
call fcn.00406806
cmp eax, ebx
je 0x40355d
push 0x1e
call eax
test eax, eax
je 0x40355d
or byte [0x434f0f], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x434fd8], eax
push ebx
lea eax, [esp + 0x34]
push 0x2b4
push eax
push ebx
push 0x42b228
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push str.Instalador_de_Firefox
call fcn.00406411
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov ebp, 0x440000
push eax
push ebp
call fcn.00406411
cmp word [0x440000], 0x22
mov dword [0x434f00], 0x400000
mov eax, ebp
jne 0x4035c6
push 0x22
mov eax, 0x440002
pop edi
push edi
push eax
call fcn.00405d13
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov dword [esp + 0x18], ecx
mov ax, word [ecx]
cmp ax, bx
je 0x4036f7
push 0x20
pop ebx
cmp ax, bx
jne 0x4035f5
inc ecx
inc ecx
cmp word [ecx], bx
je 0x4035ee
cmp word [ecx], 0x22
jne 0x403600
inc ecx
push 0x22
inc ecx
pop ebx
cmp word [ecx], 0x2f
jne 0x4036c3
inc ecx
inc ecx
cmp word [ecx], 0x53
jne 0x40362b
mov ax, word [ecx + 2]
cmp ax, 0x20
je 0x403621
test ax, ax
jne 0x40362b
mov dword [0x434fc0], 1
movzx eax, word [0x40a2c2]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40a2c0]
cdq
movzx edx, word [str.NCRC]
or edi, eax
movzx eax, word [0x40a2be]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx]
or edi, edx
cmp eax, esi
jne 0x403681
mov eax, dword [ecx + 4]
cmp eax, edi
jne 0x403681
mov ax, word [ecx + 8]
cmp ax, 0x20
je 0x40367c
test ax, ax
jne 0x403681
or dword [esp + 0x1c], 4
movzx eax, word [0x40a2b6]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40a2b4]
cdq
movzx edx, word [str.__D]
or edi, eax
movzx eax, word [0x40a2b2]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx - 4]
or edi, edx
cmp eax, esi
jne 0x4036c3
mov eax, dword [ecx]
cmp eax, edi
je 0x4036e2
push ebx
push ecx
call fcn.00405d13
mov ecx, eax
cmp word [ecx], 0x22
jne 0x4036d4
inc ecx
inc ecx
mov ax, word [ecx]
test ax, ax
jne 0x4035e6
jmp 0x4036f5
and word [ecx - 4], 0
add ecx, 4
push ecx
push 0x440800
call fcn.00406411
xor ebx, ebx
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x442800
push esi
push 0x400
call edi
call fcn.00403494
test eax, eax
jne 0x403769
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push 0x40a2a4
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.00403494
test eax, eax
jne 0x403769
push esi
push 0x3fc
call edi
push 0x40a29c
push esi
call sub.KERNEL32.dll_lstrcatW
mov edi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push esi
push str.TEMP
call edi
push esi
push 0x40a288
call edi
call fcn.00403494
test eax, eax
je 0x403834
push 0x442000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push dword [esp + 0x1c]
call fcn.00403015
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403834
cmp dword [0x434f20], ebx
je 0x403824
push ebx
push ebp
call fcn.00405d13
mov edi, eax
cmp edi, ebp
jb 0x4037ee
movzx eax, word [0x40a282]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov ebx, eax
movzx eax, word [0x40a280]
movzx ecx, word [0x40a27c]
cdq
or ebx, eax
movzx eax, word [0x40a27e]
shl eax, 0x10
or eax, ecx
xor ecx, ecx
cdq
or ecx, eax
mov eax, ebx
or eax, edx
mov edx, dword [edi]
cmp edx, ecx
jne 0x4037e6
mov edx, dword [edi + 4]
cmp edx, eax
je 0x4037ec
dec edi
dec edi
cmp edi, ebp
jae 0x4037d9
xor ebx, ebx
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403860
mov word [edi], bx
add edi, 8
push edi
call fcn.00405dee
test eax, eax
je 0x403834
push edi
push 0x440800
call fcn.00406411
push edi
push 0x441000
call fcn.00406411
mov dword [esp + 0x10], ebx
or dword [0x434fcc], 0xffffffff
call fcn.00403ae0
mov dword [esp + 0x14], eax
call fcn.00403a06
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x40396a
push 0x200010
push dword [esp + 0x10]
call fcn.00405a77
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004059e2
push 0x40a270
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatW
cmp edi, ebx
je 0x403881
push 0x40a26c
push esi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatW
mov ebp, 0x441800
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x403834
cmp edi, ebx
push esi
je 0x4038a9
call fcn.00405948
jmp 0x4038ae
call fcn.004059c5
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x440800], bx
jne 0x4038c9
push ebp
push 0x440800
call fcn.00406411
push dword [esp + 0x18]
push section..ndata
call fcn.00406411
movzx eax, word [0x40a25a]
movzx ecx, word [0x40a258]
shl eax, 0x10
or eax, ecx
push 0x1a
mov dword [0x436800], eax
pop ebp
mov edi, 0x42aa28
mov eax, dword [0x434f14]
push dword [eax + 0x120]
push edi
call fcn.0040644e
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
cmp dword [esp + 0x10], ebx
je 0x403954
push 1
push edi
push 0x443800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403954
push ebx
push edi
call fcn.004061d7
mov eax, dword [0x434f14]
push dword [eax + 0x124]
push edi
call fcn.0040644e
push edi
call fcn.004059fa
cmp eax, ebx
je 0x403954
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc word [0x436800]
dec ebp
jne 0x4038f7
push ebx
push esi
call fcn.004061d7
jmp 0x403834
cmp dword [0x434fb4], ebx
je 0x4039ee
lea eax, [esp + 0x14]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x4039be
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebx
push ebx
lea eax, [esp + 0x24]
push ebx
push eax
push ebx
push dword [esp + 0x28]
mov dword [esp + 0x34], 1
mov dword [esp + 0x40], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406806
cmp eax, ebx
mov esi, 0x80040002
je 0x4039da
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x4039e7
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4039ee
push 9
call fcn.0040140b
mov eax, dword [0x434fcc]
cmp eax, 0xffffffff
je 0x4039fc
mov dword [esp + 0x10], eax
push dword [esp + 0x10]
call dword [sym.imp.KERNEL32.dll_ExitProcess]