Function at 0x421440
Capabilities:
Check if file exists
Get file attributes
Query environment variable

Disassembly:
push ebp
lea ebp, [esp - 0xa6c]
sub esp, 0xa6c
push 0xffffffffffffffff
push 0x52d6c0
mov eax, dword fs:[0]
push eax
push ecx
mov eax, dword [0x585184]
xor eax, ebp
mov dword [ebp + 0xa68], eax
push ebx
push esi
push edi
push eax
lea eax, [ebp - 0xc]
mov dword fs:[0], eax
mov esi, ecx
mov ebx, dword [ebp + 0xa74]
test ebx, ebx
je 0x4214ce
mov edi, dword [esi]
mov dword [ebp + 0x5c], 0
mov dword [ebp + 0x5c], edi
test edi, edi
je 0x4214a0
mov eax, dword [edi]
test eax, eax
je 0x4214a0
push eax
call dword [sym.imp.KERNEL32.dll_EnterCriticalSection]
mov dword [ebp - 4], 0
mov eax, dword [esi]
cmp byte [eax + 0x48], 0
jne 0x4214d5
mov dword [ebp - 4], 0xffffffff
test edi, edi
je 0x4214ce
mov eax, dword [edi]
test eax, eax
je 0x4214c7
push eax
call dword [sym.imp.KERNEL32.dll_LeaveCriticalSection]
mov dword [ebp + 0x5c], 0
xor al, al
jmp 0x421783
push str.COMCTL32.DLL
mov dword [ebp + 0x3c], 8
mov dword [ebp + 0x40], 0xff
call dword [sym.imp.KERNEL32.dll_LoadLibraryA]
push 0x55c600
push eax
call dword [sym.imp.KERNEL32.dll_GetProcAddress]
test eax, eax
je 0x421504
lea ecx, [ebp + 0x3c]
push ecx
call eax
push str.User32.dll
call dword [sym.imp.KERNEL32.dll_LoadLibraryA]
push 0x55c624
push eax
call dword [sym.imp.KERNEL32.dll_GetProcAddress]
mov dword [ebp - 0x10], eax
test eax, eax
je 0x4215ec
mov eax, dword [esi]
cmp dword [eax + 0x74], 0
je 0x4215ec
cmp dword [eax + 0x5c], 0
je 0x4215ec
add eax, 0x64
lea ecx, [ebp + 0x44]
push eax
call fcn.00405950
mov byte [ebp - 4], 1
lea ecx, [ebp + 0x44]
push 2
push 0x55c630
call fcn.00407830
mov ecx, ebx
lea edx, [ecx + 2]
mov ax, word [ecx]
add ecx, 2
test ax, ax
jne 0x421560
sub ecx, edx
sar ecx, 1
push ecx
push ebx
lea ecx, [ebp + 0x44]
call fcn.00407830
mov ecx, dword [esi]
add ecx, 0x4c
cmp dword [ecx + 0x14], 8
jb 0x421586
mov ecx, dword [ecx]
cmp dword [ebp + 0x58], 8
lea eax, [ebp + 0x44]
push 0
cmovae eax, dword [ebp + 0x44]
push ecx
push eax
push 0
call dword [ebp - 0x10]
mov byte [ebp - 4], 0
mov edx, dword [ebp + 0x58]
cmp edx, 8
jb 0x4215d8
mov ecx, dword [ebp + 0x44]
lea edx, [edx*2 + 2]
mov eax, ecx
cmp edx, 0x1000
jb 0x4215ce
mov ecx, dword [ecx - 4]
add edx, 0x23
sub eax, ecx
add eax, 0xfffffffc
cmp eax, 0x1f
ja 0x4217a8
push edx
push ecx
call fcn.00502621
add esp, 8
xor eax, eax
mov dword [ebp + 0x54], 0
mov dword [ebp + 0x58], 7
mov word [ebp + 0x44], ax
push 0x208
lea eax, [ebp + 0x860]
push 0
push eax
call fcn.00504c10
mov ebx, dword [esi]
add esp, 0xc
cmp dword [ebx + 0x90], 8
lea esi, [ebx + 0x7c]
jb 0x421612
mov esi, dword [esi]
lea ecx, [ebp + 0x860]
mov edx, 0x103
mov eax, ecx
sub esi, eax
lea eax, [edx + 0x7ffffefb]
test eax, eax
je 0x42163f
movzx eax, word [esi + ecx]
test ax, ax
je 0x42163f
mov word [ecx], ax
add ecx, 2
sub edx, 1
jne 0x421621
test edx, edx
lea eax, [ecx - 2]
cmovne eax, ecx
xor ecx, ecx
mov word [eax], cx
cmp word [ebp + 0x860], cx
je 0x421762
cmp byte [ebx + 0x94], cl
je 0x42167a
lea ecx, [ebp + 0x860]
call fcn.0042b3a0
xor eax, eax
mov word [ebp + 0x860], ax
jmp 0x421762
push 0x800
lea eax, [ebp + 0x60]
push 0
push eax
call fcn.00504c10
mov ebx, dword [sym.imp.KERNEL32.dll_ExpandEnvironmentStringsW]
lea eax, [ebp + 0x60]
add esp, 0xc
push 0x3fe
push eax
push str._programfiles_Internet_Exploreriexplore.exe
call ebx
mov esi, dword [sym.imp.KERNEL32.dll_GetFileAttributesW]
dec eax
cmp eax, 0x3fd
ja 0x4216c0
lea eax, [ebp + 0x60]
push eax
call esi
cmp eax, 0xffffffff
je 0x4216c0
test al, 0x10
je 0x4216eb
push 0x3fe
lea eax, [ebp + 0x60]
push eax
push str._programfiles_x86__Internet_Exploreriexplore.exe
call ebx
dec eax
cmp eax, 0x3fd
ja 0x421762
lea eax, [ebp + 0x60]
push eax
call esi
cmp eax, 0xffffffff
je 0x421762
test al, 0x10
jne 0x421762
lea eax, [ebp + 0x60]
mov dword [ebp], 0x3c
xorps xmm0, xmm0
mov dword [ebp + 0x10], eax
lea eax, [ebp + 0x860]
movlpd qword [ebp + 0x20], xmm0
push str.Shell32.dll
movlpd qword [ebp + 0x28], xmm0
movlpd qword [ebp + 0x30], xmm0
mov dword [ebp + 4], 0
mov dword [ebp + 8], 0
mov dword [ebp + 0xc], 0
mov dword [ebp + 0x14], eax
mov dword [ebp + 0x18], 0
mov dword [ebp + 0x1c], 1
mov dword [ebp + 0x38], 0
call dword [sym.imp.KERNEL32.dll_LoadLibraryA]
test eax, eax
je 0x421762
push 0x55b6f4
push eax
call dword [sym.imp.KERNEL32.dll_GetProcAddress]
test eax, eax
je 0x421762
lea ecx, [ebp]
push ecx
call eax
mov dword [ebp - 4], 0xffffffff
test edi, edi
je 0x421781
mov eax, dword [edi]
test eax, eax
je 0x42177a
push eax
call dword [sym.imp.KERNEL32.dll_LeaveCriticalSection]
mov dword [ebp + 0x5c], 0
mov al, 1
mov ecx, dword [ebp - 0xc]
mov dword fs:[0], ecx
pop ecx
pop edi
pop esi
pop ebx
mov ecx, dword [ebp + 0xa68]
xor ecx, ebp
call fcn.00502346
lea esp, [ebp + 0xa6c]
pop ebp
ret 4
call fcn.00506759
int3