Function at 0x4039b6
Capabilities:
Accept command line arguments
Check os version
Copy file
Delete file
Get common file path
Get file attributes
Get file system object information
Set current directory
Set environment variable
Shutdown system
Terminate process

Disassembly:
sub esp, 0x3f8
push ebp
push esi
push edi
push 0x20
pop edi
xor ebp, ebp
push 0x8001
mov dword [esp + 0x20], ebp
mov dword [esp + 0x18], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x10], ebp
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExW]
lea eax, [esp + 0x34]
push eax
mov dword [esp + 0x4c], ebp
mov dword [esp + 0x14c], ebp
mov dword [esp + 0x150], ebp
mov dword [esp + 0x38], 0x11c
call esi
test eax, eax
jne 0x403a42
lea eax, [esp + 0x34]
mov dword [esp + 0x34], 0x114
push eax
call esi
mov ax, word [esp + 0x48]
mov ecx, dword [esp + 0x62]
sub ax, 0x53
add ecx, 0xffffffd0
neg ax
sbb eax, eax
mov byte [esp + 0x14e], 4
not eax
and eax, ecx
mov word [esp + 0x148], ax
cmp dword [esp + 0x38], 0xa
jae 0x403a4f
and word [esp + 0x42], 0
mov eax, dword [esp + 0x40]
movzx ecx, byte [esp + 0x3c]
mov dword [0x438178], eax
xor eax, eax
mov ah, byte [esp + 0x38]
movzx eax, ax
or eax, ecx
xor ecx, ecx
mov ch, byte [esp + 0x148]
movzx ecx, cx
shl eax, 0x10
or eax, ecx
movzx ecx, byte [esp + 0x14e]
or eax, ecx
mov dword [0x43817c], eax
cmp word [0x43817e], 0x600
je 0x403aa4
push ebp
call fcn.00407150
cmp eax, ebp
je 0x403aa4
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.004070e0
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x403aa9
push 0xc
call fcn.00407150
push 0xa
call fcn.00407150
push 8
mov dword [0x4380c4], eax
call fcn.00407150
cmp eax, ebp
je 0x403aec
push 0x1e
call eax
test eax, eax
je 0x403aec
or byte [0x43817c], 0x80
push ebx
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebp
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x438180], eax
push ebp
lea eax, [esp + 0x158]
push 0x2b4
push eax
push ebp
push 0x42cbc0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x4370c0
call fcn.00406b0e
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov ebx, 0x443000
push eax
push ebx
call fcn.00406b0e
cmp word [0x443000], 0x22
mov dword [0x4380c0], 0x400000
mov eax, ebx
jne 0x403b58
push 0x22
mov eax, 0x443002
pop edi
push edi
push eax
call fcn.0040640a
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov dword [esp + 0x14], ecx
mov ax, word [ecx]
cmp ax, bp
je 0x403c89
push 0x20
pop ebp
cmp ax, bp
jne 0x403b87
inc ecx
inc ecx
cmp word [ecx], bp
je 0x403b80
cmp word [ecx], 0x22
jne 0x403b92
inc ecx
push 0x22
inc ecx
pop ebp
cmp word [ecx], 0x2f
jne 0x403c55
inc ecx
inc ecx
cmp word [ecx], 0x53
jne 0x403bbd
mov ax, word [ecx + 2]
cmp ax, 0x20
je 0x403bb3
test ax, ax
jne 0x403bbd
mov dword [0x438160], 1
movzx eax, word [0x40bfb6]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40bfb4]
cdq
movzx edx, word [str.NCRC]
or edi, eax
movzx eax, word [0x40bfb2]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx]
or edi, edx
cmp eax, esi
jne 0x403c13
mov eax, dword [ecx + 4]
cmp eax, edi
jne 0x403c13
mov ax, word [ecx + 8]
cmp ax, 0x20
je 0x403c0e
test ax, ax
jne 0x403c13
or dword [esp + 0x10], 4
movzx eax, word [0x40bfaa]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40bfa8]
cdq
movzx edx, word [str.__D]
or edi, eax
movzx eax, word [0x40bfa6]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx - 4]
or edi, edx
cmp eax, esi
jne 0x403c55
mov eax, dword [ecx]
cmp eax, edi
je 0x403c74
push ebp
push ecx
call fcn.0040640a
mov ecx, eax
cmp word [ecx], 0x22
jne 0x403c66
inc ecx
inc ecx
mov ax, word [ecx]
test ax, ax
jne 0x403b78
jmp 0x403c87
and word [ecx - 4], 0
add ecx, 4
push ecx
push 0x443800
call fcn.00406b0e
xor ebp, ebp
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x445800
push esi
push 0x400
call edi
call fcn.00403985
test eax, eax
jne 0x403cfb
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.00403985
test eax, eax
jne 0x403cfb
push esi
push 0x3fc
call edi
push 0x40bf90
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 0x40bf7c
call edi
call fcn.00403985
test eax, eax
je 0x403f09
push 0x445000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push dword [esp + 0x10]
call fcn.00403506
cmp eax, ebp
mov dword [esp + 0x18], eax
jne 0x403f09
cmp dword [0x4380dc], ebp
je 0x403dba
push ebp
push ebx
call fcn.0040640a
mov edi, eax
cmp edi, ebx
jb 0x403d80
movzx eax, word [0x40bf76]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov ebp, eax
movzx eax, word [0x40bf74]
movzx ecx, word [str.___]
cdq
or ebp, eax
movzx eax, word [0x40bf72]
shl eax, 0x10
or eax, ecx
xor ecx, ecx
cdq
or ecx, eax
mov eax, ebp
or eax, edx
mov edx, dword [edi]
cmp edx, ecx
jne 0x403d78
mov edx, dword [edi + 4]
cmp edx, eax
je 0x403d7e
dec edi
dec edi
cmp edi, ebx
jae 0x403d6b
xor ebp, ebp
cmp edi, ebx
mov dword [esp + 0x18], str.Error_launching_installer
jb 0x403dd6
mov word [edi], bp
add edi, 8
push edi
call fcn.004064e5
test eax, eax
je 0x403f09
push edi
push 0x443800
call fcn.00406b0e
push edi
push 0x444000
call fcn.00406b0e
mov dword [esp + 0x18], ebp
or dword [0x43816c], 0xffffffff
call fcn.004040d6
push 1
mov dword [esp + 0x24], eax
call fcn.00406e6b
jmp 0x403f09
call fcn.00406080
push esi
mov dword [esp + 0x20], eax
call sub.KERNEL32.dll_lstrlenW
push dword [esp + 0x14]
mov edi, eax
push section..ndata
call fcn.00406b0e
cmp word [0x443800], bp
jne 0x403e0d
push 0x444800
push 0x443800
call fcn.00406b0e
lea eax, [edi*2 + 0x445800]
mov dword [esp + 0x10], 1
mov dword [esp + 0x24], eax
mov edi, 0x43b800
mov ebx, 0x43c000
mov dword [esp + 0x14], ebp
movzx ebp, word [esp + 0x10]
push ebp
push str.nsu_X.tmp
push dword [esp + 0x2c]
call dword [sym.imp.USER32.dll_wsprintfW]
mov eax, dword [0x4380d0]
add esp, 0xc
push dword [eax + 0x120]
push edi
call fcn.00406b4b
cmp dword [esp + 0x1c], 0
push esi
je 0x403e66
call fcn.00406009
jmp 0x403e6b
call fcn.00406063
test eax, eax
je 0x403ea9
push edi
call dword [sym.imp.KERNEL32.dll_GetFileAttributesW]
test ah, 4
jne 0x403e9a
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
test eax, eax
je 0x403e9a
push 1
push esi
call fcn.004061c1
mov eax, dword [esp + 0x14]
inc dword [esp + 0x14]
test eax, eax
je 0x403e33
inc dword [esp + 0x10]
xor ebp, ebp
cmp word [esp + 0x10], bp
jne 0x403e2a
jmp 0x403f09
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
push 0
push esi
call fcn.004068ce
push 1
push edi
push 0x446800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403f07
push 0
push edi
call fcn.004068ce
mov eax, dword [0x4380d0]
push dword [eax + 0x124]
push ebx
call fcn.00406b4b
push ebx
call fcn.00406098
test eax, eax
jne 0x403f31
mov eax, dword [esp + 0x14]
inc dword [esp + 0x14]
test eax, eax
jne 0x403f07
push edi
call fcn.004070b9
test eax, eax
je 0x403e33
xor ebp, ebp
call fcn.00403fdb
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x18], ebp
pop ebx
je 0x403f3f
push 0x200010
push dword [esp + 0x18]
call fcn.00406115
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
and dword [esp + 0x18], 0
jmp 0x403f07
cmp dword [0x438154], ebp
je 0x403fc3
lea eax, [esp + 0x18]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x403f93
lea eax, [esp + 0x28]
push eax
push str.SeShutdownPrivilege
push ebp
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebp
push ebp
lea eax, [esp + 0x2c]
push ebp
push eax
push ebp
push dword [esp + 0x2c]
mov dword [esp + 0x3c], 1
mov dword [esp + 0x48], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00407150
cmp eax, ebp
mov esi, 0x80040002
je 0x403faf
push esi
push 0x25
push ebp
push ebp
push ebp
call eax
test eax, eax
je 0x403fbc
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403fc3
push 9
call fcn.0040140b
mov eax, dword [0x43816c]
cmp eax, 0xffffffff
je 0x403fd1
mov dword [esp + 0x1c], eax
push dword [esp + 0x1c]
call dword [sym.imp.KERNEL32.dll_ExitProcess]