Function at 0x4037ad
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, 0x184
push ebx
push esi
push edi
xor ebx, ebx
push 0x8001
mov dword [esp + 0x18], ebx
mov dword [esp + 0x10], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x20], ebx
mov byte [esp + 0x14], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_GetVersion]
and eax, 0xbfffffff
cmp ax, 6
mov dword [0x425c6c], eax
je 0x4037ff
push ebx
call fcn.00406cdc
cmp eax, ebx
je 0x4037ff
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406c6e
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403804
push 0xb
call fcn.00406cdc
push 9
call fcn.00406cdc
push 7
mov dword [0x425c64], eax
call fcn.00406cdc
cmp eax, ebx
je 0x403846
push 0x1e
call eax
test eax, eax
je 0x403846
or byte [0x425c6f], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x425d38], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x420600
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x425460
call fcn.00406689
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x42b000
push eax
push ebp
call fcn.00406689
cmp byte [0x42b000], 0x22
mov dword [0x425c60], 0x400000
mov eax, ebp
jne 0x4038b0
mov byte [esp + 0x14], 0x22
mov eax, 0x42b001
push dword [esp + 0x14]
push eax
call fcn.0040604c
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x40398a
cmp cl, 0x20
jne 0x4038d5
inc eax
cmp byte [eax], 0x20
je 0x4038cf
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x4038e5
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x40397a
inc eax
cmp byte [eax], 0x53
jne 0x40390a
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403900
cmp cl, bl
jne 0x40390a
mov dword [0x425d20], 1
movsx ecx, byte [0x40a83b]
movsx edx, byte [0x40a83a]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a839]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x40394a
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403945
cmp cl, bl
jne 0x40394a
or dword [esp + 0x20], 4
movsx ecx, byte [0x40a833]
movsx edx, byte [0x40a832]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a831]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x403996
push dword [esp + 0x14]
push eax
call fcn.0040604c
cmp byte [eax], 0x22
jne 0x40398a
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x4038ca
jmp 0x4039a7
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x42b400
call fcn.00406689
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x42c400
push esi
push 0x400
call edi
call fcn.0040377c
test eax, eax
jne 0x403a19
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.0040377c
test eax, eax
jne 0x403a19
push esi
push 0x3fc
call edi
push 0x40a824
push esi
call sub.KERNEL32.dll_lstrcatA
mov edi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableA]
push esi
push str.TEMP
call edi
push esi
push 0x40a818
call edi
call fcn.0040377c
test eax, eax
je 0x403ace
push 0x42c000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.0040333c
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403ace
cmp dword [0x425c80], ebx
je 0x403ab7
push ebx
push ebp
call fcn.0040604c
mov edi, eax
cmp edi, ebp
jb 0x403a82
movsx eax, byte [0x40a813]
movsx ecx, byte [0x40a812]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a811]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x403a82
dec edi
cmp edi, ebp
jae 0x403a79
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403afa
mov byte [edi], bl
add edi, 4
push edi
call fcn.0040610f
test eax, eax
je 0x403ace
push edi
push 0x42b400
call fcn.00406689
push edi
push 0x42b800
call fcn.00406689
mov dword [esp + 0x10], ebx
or dword [0x425d2c], 0xffffffff
call fcn.00403d97
push 1
mov dword [esp + 0x1c], eax
call fcn.004069fd
call fcn.00403c9c
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403c02
push 0x200010
push dword [esp + 0x10]
call fcn.00405d50
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405cbb
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403b1b
push 0x40a804
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x42bc00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403ace
cmp edi, ebx
push esi
je 0x403b43
call fcn.00405c21
jmp 0x403b48
call fcn.00405c9e
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x42b400], bl
jne 0x403b62
push ebp
push 0x42b400
call fcn.00406689
push dword [esp + 0x1c]
push section..ndata
call fcn.00406689
movsx cx, byte [0x40a7f8]
xor eax, eax
push 0x1a
mov ah, byte [0x40a7f9]
pop ebp
or eax, ecx
mov edi, 0x420200
mov word [0x426400], ax
mov eax, dword [0x425c74]
push dword [eax + 0x120]
push edi
call fcn.0040671c
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403bed
push 1
push edi
push 0x42cc00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403bed
push ebx
push edi
call fcn.00406468
mov eax, dword [0x425c74]
push dword [eax + 0x124]
push edi
call fcn.0040671c
push edi
call fcn.00405cd3
cmp eax, ebx
je 0x403bed
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x426400]
dec ebp
jne 0x403b90
push ebx
push esi
call fcn.00406468
jmp 0x403ace
cmp dword [0x425d14], ebx
je 0x403c84
lea eax, [esp + 0x18]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
push 2
test eax, eax
pop edi
je 0x403c55
lea eax, [esp + 0x24]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push ebx
push ebx
lea eax, [esp + 0x28]
push ebx
push eax
push ebx
push dword [esp + 0x2c]
mov dword [esp + 0x38], 1
mov dword [esp + 0x44], edi
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406cdc
cmp eax, ebx
mov esi, 0x80040002
je 0x403c71
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403c7d
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403c84
push 9
call fcn.0040140b
mov eax, dword [0x425d2c]
cmp eax, 0xffffffff
je 0x403c92
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]