Function at 0x403311
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]
cmp ax, 6
je 0x403357
push ebx
call fcn.0040649b
cmp eax, ebx
je 0x403357
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040642b
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x40335c
push ebp
push 9
call fcn.0040649b
push 7
call fcn.0040649b
mov dword [0x7a8a24], eax
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x7a8ad8], eax
push ebx
lea eax, [esp + 0x34]
push 0x2b4
push eax
push ebx
push 0x79fee0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x7a7a20
call fcn.004060c1
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov ebp, 0x7b3000
push eax
push ebp
call fcn.004060c1
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleHandleW]
cmp word [0x7b3000], 0x22
mov dword [0x7a8a20], eax
mov eax, ebp
jne 0x4033f0
push 0x22
mov eax, 0x7b3002
pop edi
push edi
push eax
call fcn.00405aa2
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 0x403521
push 0x20
pop ebx
cmp ax, bx
jne 0x40341f
inc ecx
inc ecx
cmp word [ecx], bx
je 0x403418
cmp word [ecx], 0x22
jne 0x40342a
inc ecx
push 0x22
inc ecx
pop ebx
cmp word [ecx], 0x2f
jne 0x4034ed
inc ecx
inc ecx
cmp word [ecx], 0x53
jne 0x403455
mov ax, word [ecx + 2]
cmp ax, 0x20
je 0x40344b
test ax, ax
jne 0x403455
mov dword [0x7a8ac0], 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 0x4034ab
mov eax, dword [ecx + 4]
cmp eax, edi
jne 0x4034ab
mov ax, word [ecx + 8]
cmp ax, 0x20
je 0x4034a6
test ax, ax
jne 0x4034ab
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 [0x40a2b0]
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 0x4034ed
mov eax, dword [ecx]
cmp eax, edi
je 0x40350c
push ebx
push ecx
call fcn.00405aa2
mov ecx, eax
cmp word [ecx], 0x22
jne 0x4034fe
inc ecx
inc ecx
mov ax, word [ecx]
test ax, ax
jne 0x403410
jmp 0x40351f
and word [ecx - 4], 0
add ecx, 4
push ecx
push 0x7b3800
call fcn.004060c1
xor ebx, ebx
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x7b5800
push esi
push 0x400
call edi
call fcn.004032e0
test eax, eax
jne 0x403593
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.004032e0
test eax, eax
jne 0x403593
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.004032e0
test eax, eax
je 0x40365e
push 0x7b5000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push dword [esp + 0x1c]
call fcn.00402e82
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x40365e
cmp dword [0x7a8a3c], ebx
je 0x40364e
push ebx
push ebp
call fcn.00405aa2
mov edi, eax
cmp edi, ebp
jb 0x403618
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 0x403610
mov edx, dword [edi + 4]
cmp edx, eax
je 0x403616
dec edi
dec edi
cmp edi, ebp
jae 0x403603
xor ebx, ebx
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x40368a
mov word [edi], bx
add edi, 8
push edi
call fcn.00405b7d
test eax, eax
je 0x40365e
push edi
push 0x7b3800
call fcn.004060c1
push edi
push 0x7b4000
call fcn.004060c1
mov dword [esp + 0x10], ebx
or dword [0x7a8acc], 0xffffffff
call fcn.0040390a
mov dword [esp + 0x14], eax
call fcn.00403830
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403794
push 0x200010
push dword [esp + 0x10]
call fcn.00405806
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405789
push 0x40a270
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatW
cmp edi, ebx
je 0x4036ab
push 0x40a26c
push esi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatW
mov ebp, 0x7b4800
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x40365e
cmp edi, ebx
push esi
je 0x4036d3
call fcn.004056ef
jmp 0x4036d8
call fcn.0040576c
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x7b3800], bx
jne 0x4036f3
push ebp
push 0x7b3800
call fcn.004060c1
push dword [esp + 0x18]
push section..ndata
call fcn.004060c1
movzx eax, word [0x40a25a]
movzx ecx, word [0x40a258]
shl eax, 0x10
or eax, ecx
push 0x1a
mov dword [0x7a9800], eax
pop ebp
mov edi, 0x79f6e0
mov eax, dword [0x7a8a30]
push dword [eax + 0x120]
push edi
call fcn.004060e3
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
cmp dword [esp + 0x10], ebx
je 0x40377e
push 1
push edi
push 0x7b6800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x40377e
push ebx
push edi
call fcn.00405f62
mov eax, dword [0x7a8a30]
push dword [eax + 0x124]
push edi
call fcn.004060e3
push edi
call fcn.004057a1
cmp eax, ebx
je 0x40377e
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc word [0x7a9800]
dec ebp
jne 0x403721
push ebx
push esi
call fcn.00405f62
jmp 0x40365e
cmp dword [0x7a8ab4], ebx
je 0x403818
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 0x4037e8
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.0040649b
cmp eax, ebx
mov esi, 0x80040002
je 0x403804
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403811
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403818
push 9
call fcn.0040140b
mov eax, dword [0x7a8acc]
cmp eax, 0xffffffff
je 0x403826
mov dword [esp + 0x10], eax
push dword [esp + 0x10]
call dword [sym.imp.KERNEL32.dll_ExitProcess]