Function at 0x403854
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, 0x3ec
push ebx
push ebp
push edi
push 4
push 0x40000000
xor ebx, ebx
mov edi, str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
push str.C:Mircmirc.ini
mov dword [esp + 0x18], ebx
mov ebp, ebx
call fcn.00406ae0
cmp eax, 0xffffffff
je 0x40388c
pop edi
pop ebp
xor eax, eax
pop ebx
add esp, 0x3ec
ret
push esi
push 0x8001
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExW]
lea eax, [esp + 0x2c]
xorps xmm0, xmm0
mov dword [esp + 0x40], ebx
push eax
movlpd qword [esp + 0x144], xmm0
mov dword [esp + 0x30], 0x11c
call esi
test eax, eax
jne 0x4038f8
lea eax, [esp + 0x2c]
mov dword [esp + 0x2c], 0x114
push eax
call esi
push 0x53
pop eax
mov dl, 4
mov byte [esp + 0x146], dl
cmp word [esp + 0x40], ax
jne 0x4038f4
mov eax, dword [esp + 0x5a]
add eax, 0xffffffd0
mov word [esp + 0x140], ax
jmp 0x4038ff
xor eax, eax
jmp 0x4038ea
mov dl, byte [esp + 0x146]
cmp dword [esp + 0x30], 0xa
jae 0x403911
movzx eax, word [esp + 0x38]
mov dword [esp + 0x38], eax
jmp 0x403915
mov eax, dword [esp + 0x38]
mov dword [0x429638], eax
movzx eax, byte [esp + 0x30]
shl ax, 8
movzx ecx, ax
movzx eax, byte [esp + 0x34]
or ecx, eax
movzx eax, byte [esp + 0x140]
shl ax, 8
shl ecx, 0x10
movzx eax, ax
or ecx, eax
movzx eax, dl
or ecx, eax
mov eax, 0x600
mov dword [0x42963c], ecx
sar ecx, 0x10
cmp cx, ax
je 0x40396a
push ebx
call fcn.00406aab
test eax, eax
je 0x40396a
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406363
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc esi
add esi, eax
cmp byte [esi], bl
jne 0x40396f
push 0xc
call fcn.00406aab
push 0xa
call fcn.00406aab
push 8
mov dword [0x428530], eax
call fcn.00406aab
test eax, eax
je 0x4039b0
push 0x1e
call eax
test eax, eax
je 0x4039b0
or byte [0x42963c], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x2b4
mov dword [0x4295a0], eax
lea eax, [esp + 0x150]
push eax
push ebx
push 0x4085f0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x428540
call fcn.00406cdf
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
mov esi, 0x434000
push esi
call fcn.00406cdf
movzx ecx, word [0x434000]
push 0x22
pop ebx
push 0x20
pop edx
cmp cx, bx
mov dword [0x428534], 0x400000
mov eax, ebx
mov dword [esp + 0x14], ebx
cmovne eax, edx
mov edx, 0x434002
movzx eax, ax
push eax
mov eax, esi
cmove eax, edx
push eax
call fcn.004067bb
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov ebx, ecx
mov dword [esp + 0x18], ebx
movzx eax, word [ecx]
test ax, ax
je 0x403b2b
mov esi, eax
push 0x20
pop edx
movzx eax, si
cmp si, dx
jne 0x403a67
add ecx, 2
movzx eax, word [ecx]
cmp ax, dx
je 0x403a5c
mov ebx, edx
movzx esi, ax
movzx edx, ax
cmp ax, word [esp + 0x14]
jne 0x403a7f
movzx edx, word [ecx + 2]
push 0x22
pop eax
mov ebx, eax
cmp si, word [esp + 0x14]
lea eax, [ecx + 2]
cmovne eax, ecx
cmp dx, 0x2f
jne 0x403ae9
push 0x53
add eax, 2
pop ecx
push 0x20
pop edx
cmp word [eax], cx
jne 0x403ab6
movzx ecx, word [eax + 2]
cmp cx, dx
je 0x403aac
test cx, cx
jne 0x403ab6
mov dword [0x429620], 1
cmp dword [eax], 0x43004e
jne 0x403ad8
cmp dword [eax + 4], 0x430052
jne 0x403ad8
movzx ecx, word [eax + 8]
cmp cx, dx
je 0x403ad5
test cx, cx
jne 0x403ad8
or ebp, 4
cmp dword [eax - 4], 0x2f0020
jne 0x403ae9
cmp dword [eax], 0x3d0044
je 0x403b13
push ebx
push eax
call fcn.004067bb
mov ecx, eax
push 0x22
pop ebx
movzx eax, word [ecx]
mov edx, eax
cmp ax, bx
jne 0x403b05
add ecx, 2
movzx edx, word [ecx]
movzx esi, dx
test dx, dx
jne 0x403a51
jmp 0x403b27
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x434800
call fcn.00406cdf
mov ebx, dword [esp + 0x18]
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
push 0x436800
push 0x400
call esi
call fcn.00403e79
test eax, eax
jne 0x403bb1
push 0x3fb
push 0x436800
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push 0x436800
call sub.KERNEL32.dll_lstrcatW
call fcn.00403e79
test eax, eax
jne 0x403bb1
push 0x436800
push 0x3fc
call esi
push 0x408618
mov esi, 0x436800
push esi
call sub.KERNEL32.dll_lstrcatW
push esi
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push str.TEMP
call esi
push 0x436800
push 0x40862c
call esi
call fcn.00403e79
test eax, eax
je 0x403d92
push 0x436000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push ebp
call fcn.004034df
mov edi, eax
test edi, edi
jne 0x403d92
cmp dword [0x429544], eax
je 0x403c39
xor ebp, ebp
push ebp
push 0x434000
call fcn.004067bb
mov esi, eax
mov eax, 0x434000
jmp 0x403bfe
cmp dword [esi], 0x5f0020
jne 0x403bfb
cmp dword [esi + 4], 0x3d003f
je 0x403c02
sub esi, 2
cmp esi, eax
jae 0x403bea
mov edi, str.Error_launching_installer
cmp esi, eax
jb 0x403c4c
xor eax, eax
mov word [esi], ax
add esi, 8
push esi
call fcn.004067fd
test eax, eax
je 0x403ddc
push esi
push 0x434800
call fcn.00406cdf
push esi
push 0x435000
call fcn.00406cdf
mov edi, ebp
or dword [0x42962c], 0xffffffff
call fcn.00405c12
mov ebx, eax
jmp 0x403d96
call fcn.004066c1
push 0x436800
mov dword [esp + 0x1c], eax
call sub.KERNEL32.dll_lstrlenW
push ebx
push section..ndata
mov esi, eax
call fcn.00406cdf
cmp word [0x434800], bp
jne 0x403c84
push 0x435800
push 0x434800
call fcn.00406cdf
xor ebx, ebx
lea eax, [esi*2 + 0x436800]
inc ebx
mov dword [esp + 0x14], eax
mov esi, ebp
movzx ebp, bx
push ebp
push str.nsu_X.tmp
push eax
call dword [sym.imp.USER32.dll_wsprintfW]
mov eax, dword [0x429550]
add esp, 0xc
push dword [eax + 0x120]
push 0x42c800
call fcn.0040606d
cmp dword [esp + 0x18], 0
push 0x436800
je 0x403ccf
call fcn.00406012
jmp 0x403cd4
call fcn.00405ff2
test eax, eax
je 0x403d21
push 0x42c800
call dword [sym.imp.KERNEL32.dll_GetFileAttributesW]
test eax, 0x400
jne 0x403dba
push 0x42c800
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
test eax, eax
je 0x403dba
push 1
push 0x436800
call fcn.004068de
mov eax, esi
inc esi
test eax, eax
jne 0x403dba
mov eax, dword [esp + 0x14]
jmp 0x403c97
push 0x436800
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
push 0
push 0x436800
call fcn.00406402
push 1
push 0x42c800
push 0x437800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403d92
push 0
push 0x42c800
call fcn.00406402
mov eax, dword [0x429550]
push dword [eax + 0x124]
push 0x42d000
call fcn.0040606d
push 0x42d000
call fcn.0040689b
test eax, eax
jne 0x403dcd
mov eax, esi
inc esi
test eax, eax
jne 0x403d92
push 0x42c800
call fcn.00406794
test eax, eax
je 0x403d18
mov ebx, dword [esp + 0x10]
xor ebp, ebp
call fcn.00403812
call dword [sym.imp.ole32.dll_OleUninitialize]
test edi, edi
je 0x403de0
push 0x200010
push edi
call fcn.00406c6d
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
mov eax, dword [esp + 0x14]
inc ebx
push 0
pop ebp
test bx, bx
jne 0x403c92
jmp 0x403d92
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
xor ebp, ebp
mov edi, ebp
mov ebx, edi
jmp 0x403d98
mov ebx, ebp
jmp 0x403d96
cmp dword [0x429614], 0
je 0x403e65
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 0x403e35
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebp
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebp
push ebp
push ebp
lea eax, [esp + 0x28]
mov dword [esp + 0x28], 1
push eax
push ebp
push dword [esp + 0x2c]
mov dword [esp + 0x40], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406aab
mov esi, 0x80040002
test eax, eax
je 0x403e51
push esi
push 0x25
push ebp
push ebp
push ebp
call eax
test eax, eax
je 0x403e5e
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403e65
push 9
call fcn.00401533
cmp dword [0x42962c], 0xffffffff
cmovne ebx, dword [0x42962c]
push ebx
jmp 0x403db4