Function at 0x403859
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
mov dword [0x43f0e0], eax
cmp ax, 6
je 0x4038ab
push ebx
call fcn.00406203
cmp eax, ebx
je 0x4038ab
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406195
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x4038b0
push 0xa
call fcn.00406203
push 8
call fcn.00406203
push 6
mov dword [0x43f0e4], eax
call fcn.00406203
cmp eax, ebx
je 0x4038f5
push 0x1e
call eax
test eax, eax
je 0x4038f5
or dword [0x43f0e0], 0x40000000
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x160
mov dword [0x43f1f8], eax
lea eax, [esp + 0x3c]
push eax
push ebx
push 0x408457
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x43e8e0
call fcn.004060b2
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
push eax
mov ebp, 0x445000
push ebp
call fcn.004060b2
cmp byte [0x445000], 0x22
mov dword [0x43f0ec], 0x400000
mov eax, ebp
jne 0x40395f
mov byte [esp + 0x14], 0x22
mov eax, 0x445001
push dword [esp + 0x14]
push eax
call fcn.00405ca9
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x4039e4
cmp cl, 0x20
jne 0x403981
inc eax
cmp byte [eax], 0x20
je 0x40397b
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x403991
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x4039d4
inc eax
cmp byte [eax], 0x53
jne 0x4039b2
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x4039a8
cmp cl, bl
jne 0x4039b2
mov dword [0x43f1e0], 1
cmp dword [eax], 0x4352434e
jne 0x4039cb
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x4039c6
cmp cl, bl
jne 0x4039cb
or dword [esp + 0x20], 4
cmp dword [eax - 2], 0x3d442f20
je 0x4039ec
push dword [esp + 0x14]
push eax
call fcn.00405ca9
cmp byte [eax], 0x22
jne 0x4039e4
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x403976
jmp 0x4039fd
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x445400
call fcn.004060b2
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x446400
push esi
push 0x400
call edi
call fcn.004037fe
test eax, eax
jne 0x403a6f
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004037fe
test eax, eax
jne 0x403a6f
push esi
push 0x3fc
call edi
push 0x408440
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 0x408434
call edi
call fcn.004037fe
test eax, eax
je 0x403af0
push 0x446000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.004033f1
mov dword [esp + 0x10], eax
cmp eax, ebx
jne 0x403af0
cmp dword [0x43f158], ebx
je 0x403ae0
push ebx
push ebp
call fcn.00405ca9
mov edi, eax
jmp 0x403aa7
cmp dword [edi], 0x3d3f5f20
je 0x403aab
dec edi
cmp edi, ebp
jae 0x403a9e
mov dword [esp + 0x10], str.Error_launching_installer
cmp edi, ebp
jb 0x403b1c
mov byte [edi], bl
add edi, 4
push edi
call fcn.004063ab
test eax, eax
je 0x403af0
push edi
push 0x445400
call fcn.004060b2
push edi
push 0x445800
call fcn.004060b2
mov dword [esp + 0x10], ebx
or dword [0x43f1ec], 0xffffffff
call fcn.00405862
mov dword [esp + 0x18], eax
call fcn.0040382f
call dword [sym.imp.ole32.dll_OleUninitialize]
pop ebp
cmp dword [esp + 0xc], ebx
je 0x403c15
push 0x200010
push dword [esp + 0x10]
call fcn.00405c43
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004062b8
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403b3d
push 0x408428
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x445c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403af0
push esi
cmp edi, ebx
je 0x403b65
call fcn.00405b27
jmp 0x403b6a
call fcn.00405ba9
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x445400], bl
jne 0x403b84
push ebp
push 0x445400
call fcn.004060b2
push dword [esp + 0x1c]
push section..ndata
call fcn.004060b2
push 0x41
pop eax
push 0x1a
mov word [0x440400], ax
pop ebp
mov edi, 0x439128
mov eax, dword [0x43f0f0]
push dword [eax + 0x120]
push edi
call fcn.0040642d
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403c00
push 1
push edi
push 0x446c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403c00
push ebx
push edi
call fcn.004067ee
mov eax, dword [0x43f0f0]
push dword [eax + 0x124]
push edi
call fcn.0040642d
push edi
call fcn.00405bc6
cmp eax, ebx
je 0x403c00
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x440400]
dec ebp
jne 0x403ba3
push ebx
push esi
call fcn.004067ee
jmp 0x403af0
cmp dword [0x43f1d4], ebx
je 0x403c97
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
pop edi
test eax, eax
je 0x403c68
lea eax, [esp + 0x24]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push ebx
push ebx
push ebx
lea eax, [esp + 0x2c]
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.00406203
mov esi, 0x80040002
cmp eax, ebx
je 0x403c84
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403c90
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403c97
push 9
call fcn.0040141a
mov eax, dword [0x43f1ec]
cmp eax, 0xffffffff
je 0x403ca5
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
jmp 0x403b16