Function at 0x4030ec
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]
cmp ax, 6
je 0x403134
push ebx
call fcn.004060a5
cmp eax, ebx
je 0x403134
push 0xc00
call eax
push ebp
push str.UXTHEME
call fcn.0040603b
push str.USERENV
call fcn.0040603b
push str.SETUPAPI
call fcn.0040603b
push 9
call fcn.004060a5
push 7
call fcn.004060a5
mov dword [0x7a1f64], eax
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x7a2018], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x79d518
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x7a1760
call fcn.00405d10
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x7a8000
push eax
push ebp
call fcn.00405d10
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x7a8000], 0x22
mov dword [0x7a1f60], eax
mov eax, ebp
jne 0x4031d1
mov byte [esp + 0x14], 0x22
mov eax, 0x7a8001
push dword [esp + 0x14]
push eax
call fcn.004057ad
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x4032ab
cmp cl, 0x20
jne 0x4031f6
inc eax
cmp byte [eax], 0x20
je 0x4031f0
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x403206
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x40329b
inc eax
cmp byte [eax], 0x53
jne 0x40322b
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403221
cmp cl, bl
jne 0x40322b
mov dword [0x7a2000], 1
movsx ecx, byte [0x409183]
movsx edx, byte [0x409182]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x409181]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x40326b
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403266
cmp cl, bl
jne 0x40326b
or dword [esp + 0x20], 4
movsx ecx, byte [0x40917b]
movsx edx, byte [0x40917a]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x409179]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x4032b7
push dword [esp + 0x14]
push eax
call fcn.004057ad
cmp byte [eax], 0x22
jne 0x4032ab
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x4031eb
jmp 0x4032c8
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x7a8400
call fcn.00405d10
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x7a9400
push esi
push 0x400
call edi
call fcn.004030bb
test eax, eax
jne 0x40333a
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004030bb
test eax, eax
jne 0x40333a
push esi
push 0x3fc
call edi
push 0x40916c
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 0x409160
call edi
call fcn.004030bb
test eax, eax
je 0x4033e8
push 0x7a9000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402c66
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x4033e8
cmp dword [0x7a1f7c], ebx
je 0x4033d8
push ebx
push ebp
call fcn.004057ad
mov edi, eax
cmp edi, ebp
jb 0x4033a3
movsx eax, byte [0x40915b]
movsx ecx, byte [0x40915a]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x409159]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x4033a3
dec edi
cmp edi, ebp
jae 0x40339a
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403414
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405870
test eax, eax
je 0x4033e8
push edi
push 0x7a8400
call fcn.00405d10
push edi
push 0x7a8800
call fcn.00405d10
mov dword [esp + 0x10], ebx
or dword [0x7a200c], 0xffffffff
call fcn.00403690
mov dword [esp + 0x18], eax
call fcn.004035b6
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x40351c
push 0x200010
push dword [esp + 0x10]
call fcn.00405506
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405489
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403435
push 0x40914c
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x7a8c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x4033e8
cmp edi, ebx
push esi
je 0x40345d
call fcn.004053ef
jmp 0x403462
call fcn.0040546c
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x7a8400], bl
jne 0x40347c
push ebp
push 0x7a8400
call fcn.00405d10
push dword [esp + 0x1c]
push section..ndata
call fcn.00405d10
movsx cx, byte [0x409140]
xor eax, eax
push 0x1a
mov ah, byte [0x409141]
pop ebp
or eax, ecx
mov edi, 0x79d118
mov word [0x7a3400], ax
mov eax, dword [0x7a1f70]
push dword [eax + 0x120]
push edi
call fcn.00405d32
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403507
push 1
push edi
push 0x7a9c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403507
push ebx
push edi
call fcn.00405bcb
mov eax, dword [0x7a1f70]
push dword [eax + 0x124]
push edi
call fcn.00405d32
push edi
call fcn.004054a1
cmp eax, ebx
je 0x403507
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x7a3400]
dec ebp
jne 0x4034aa
push ebx
push esi
call fcn.00405bcb
jmp 0x4033e8
cmp dword [0x7a1ff4], ebx
je 0x40359e
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 0x40356f
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.004060a5
cmp eax, ebx
mov esi, 0x80040002
je 0x40358b
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403597
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x40359e
push 9
call fcn.0040140b
mov eax, dword [0x7a200c]
cmp eax, 0xffffffff
je 0x4035ac
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]