Function at 0x4034f1
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:
push ebp
mov ebp, esp
sub esp, 0x220
push esi
push edi
xor edi, edi
push 0x8001
mov dword [ebp - 0x10], edi
mov dword [ebp - 4], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [ebp - 8], edi
mov byte [ebp - 0xc], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExA]
lea eax, [ebp - 0xc0]
push eax
mov dword [ebp - 0xac], edi
mov dword [ebp - 0x2c], edi
mov dword [ebp - 0x28], edi
mov dword [ebp - 0xc0], 0x9c
call esi
test eax, eax
jne 0x403582
lea eax, [ebp - 0xc0]
mov dword [ebp - 0xc0], 0x94
push eax
call esi
cmp dword [ebp - 0xb0], 2
jne 0x403589
movsx cx, byte [ebp - 0x9f]
mov al, byte [ebp - 0xac]
sub ecx, 0x30
sub al, 0x53
mov byte [ebp - 0x26], 4
neg al
sbb eax, eax
not eax
and eax, ecx
mov word [ebp - 0x2c], ax
cmp dword [ebp - 0xb0], 2
jae 0x4035ad
and byte [ebp - 0x26], 0
cmp byte [ebp - 0xab], 0x41
jl 0x4035a9
movsx ax, byte [ebp - 0xab]
sub eax, 0x40
mov word [ebp - 0x2c], ax
jmp 0x4035ad
mov word [ebp - 0x2c], di
cmp dword [ebp - 0xbc], 0xa
jae 0x4035be
and word [ebp - 0xb2], 0
mov eax, dword [ebp - 0xb4]
movzx ecx, byte [ebp - 0xb8]
mov dword [0x42f4f8], eax
xor eax, eax
mov ah, byte [ebp - 0xbc]
movzx eax, ax
or eax, ecx
xor ecx, ecx
mov ch, byte [ebp - 0x2c]
movzx ecx, cx
shl eax, 0x10
or eax, ecx
movzx ecx, byte [ebp - 0x26]
or eax, ecx
mov dword [0x42f4fc], eax
cmp word [0x42f4fe], 0x600
je 0x403611
push edi
call fcn.004067b9
cmp eax, edi
je 0x403611
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040674b
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x403616
push 0xb
call fcn.004067b9
push 9
call fcn.004067b9
push 7
mov dword [0x42f444], eax
call fcn.004067b9
cmp eax, edi
je 0x403659
push 0x1e
call eax
test eax, eax
je 0x403659
or byte [0x42f4fc], 0x80
push ebx
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push edi
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42f500], eax
push edi
lea eax, [ebp - 0x220]
push 0x160
push eax
push edi
push 0x429878
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x42ec40
call fcn.004063ad
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebx, 0x435000
push eax
push ebx
call fcn.004063ad
cmp byte [0x435000], 0x22
mov dword [0x42f440], 0x400000
mov eax, ebx
jne 0x4036c4
mov byte [ebp - 0xc], 0x22
mov eax, 0x435001
push dword [ebp - 0xc]
push eax
call fcn.00405d6a
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [ebp - 0x14], eax
jmp 0x403798
cmp cl, 0x20
jne 0x4036e7
inc eax
cmp byte [eax], 0x20
je 0x4036e1
cmp byte [eax], 0x22
mov byte [ebp - 0xc], 0x20
jne 0x4036f5
inc eax
mov byte [ebp - 0xc], 0x22
cmp byte [eax], 0x2f
jne 0x403789
inc eax
cmp byte [eax], 0x53
jne 0x40371a
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403710
test cl, cl
jne 0x40371a
mov dword [0x42f4e0], 1
movsx ecx, byte [0x40a1e7]
movsx edx, byte [0x40a1e6]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a1e5]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x403759
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403755
test cl, cl
jne 0x403759
or dword [ebp - 8], 4
movsx ecx, byte [0x40a1df]
movsx edx, byte [0x40a1de]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a1dd]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x4037a4
push dword [ebp - 0xc]
push eax
call fcn.00405d6a
cmp byte [eax], 0x22
jne 0x403798
inc eax
mov cl, byte [eax]
test cl, cl
jne 0x4036dc
jmp 0x4037b6
and byte [eax - 2], 0
add eax, 2
push eax
push 0x435400
call fcn.004063ad
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x436400
push esi
push 0x400
call edi
call fcn.004034c0
test eax, eax
jne 0x403828
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004034c0
test eax, eax
jne 0x403828
push esi
push 0x3fc
call edi
push 0x40a1d0
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 0x40a1c4
call edi
call fcn.004034c0
test eax, eax
je 0x4038d3
push 0x436000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [ebp - 8]
call fcn.00402f5c
test eax, eax
mov dword [ebp - 4], eax
jne 0x4038d3
cmp dword [0x42f45c], eax
je 0x4038c4
push eax
push ebx
call fcn.00405d6a
mov edi, eax
cmp edi, ebx
jb 0x40388f
movsx eax, byte [0x40a1bf]
movsx ecx, byte [0x40a1be]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a1bd]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x40388f
dec edi
cmp edi, ebx
jae 0x403886
cmp edi, ebx
mov dword [ebp - 4], str.Error_launching_installer
jb 0x4038ff
and byte [edi], 0
add edi, 4
push edi
call fcn.00405e2d
test eax, eax
je 0x4038d3
push edi
push 0x435400
call fcn.004063ad
push edi
push 0x435800
call fcn.004063ad
and dword [ebp - 4], 0
or dword [0x42f4ec], 0xffffffff
call fcn.00403b93
mov dword [ebp - 0x10], eax
call fcn.00403aa1
call dword [sym.imp.ole32.dll_OleUninitialize]
xor edi, edi
pop ebx
cmp dword [ebp - 4], edi
je 0x403a0d
push 0x200010
push dword [ebp - 4]
call fcn.00405ac3
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405a2e
push str.nsu
push esi
mov ebx, eax
call sub.KERNEL32.dll_lstrcatA
test ebx, ebx
je 0x403920
push 0x40a1b0
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov edi, 0x435c00
push edi
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x4038d3
test ebx, ebx
push esi
je 0x403948
call fcn.00405994
jmp 0x40394d
call fcn.00405a11
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x435400], 0
jne 0x403968
push edi
push 0x435400
call fcn.004063ad
push dword [ebp - 0x14]
push section..ndata
call fcn.004063ad
movsx cx, byte [0x40a1a4]
xor eax, eax
mov dword [ebp - 8], 0x1a
mov ah, byte [0x40a1a5]
mov edi, 0x429478
or eax, ecx
mov word [0x430400], ax
mov eax, dword [0x42f450]
push dword [eax + 0x120]
push edi
call fcn.00406440
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
xor ebx, ebx
cmp dword [ebp - 4], ebx
je 0x4039f6
push 1
push edi
push 0x436c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x4039f6
push ebx
push edi
call fcn.00406186
mov eax, dword [0x42f450]
push dword [eax + 0x124]
push edi
call fcn.00406440
push edi
call fcn.00405a46
cmp eax, ebx
je 0x4039f6
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [ebp - 4], ebx
inc byte [0x430400]
dec dword [ebp - 8]
jne 0x403999
push ebx
push esi
call fcn.00406186
jmp 0x4038d3
cmp dword [0x42f4d4], edi
je 0x403a8b
lea eax, [ebp - 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 0x403a5b
lea eax, [ebp - 0x20]
push eax
push str.SeShutdownPrivilege
push edi
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push edi
push edi
lea eax, [ebp - 0x24]
push edi
push eax
push edi
push dword [ebp - 0x14]
mov dword [ebp - 0x24], 1
mov dword [ebp - 0x18], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.004067b9
cmp eax, edi
mov esi, 0x80040002
je 0x403a77
push esi
push 0x25
push edi
push edi
push edi
call eax
test eax, eax
je 0x403a84
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403a8b
push 9
call fcn.0040140b
mov eax, dword [0x42f4ec]
cmp eax, 0xffffffff
je 0x403a98
mov dword [ebp - 0x10], eax
push dword [ebp - 0x10]
call dword [sym.imp.KERNEL32.dll_ExitProcess]