Function at 0x4021f0
Capabilities:
Check os version
Get system information on windows

Disassembly:
push ebp
mov ebp, esp
push 0xffffffffffffffff
push 0x41790b
mov eax, dword fs:[0]
push eax
sub esp, 0x17c
mov eax, dword [0x4223fc]
xor eax, ebp
mov dword [ebp - 0x10], eax
push esi
push eax
lea eax, [ebp - 0xc]
mov dword fs:[0], eax
lea eax, [ebp - 0x34]
push eax
call dword [sym.imp.KERNEL32.dll_GetSystemInfo]
lea eax, [ebp - 0x158]
push eax
mov dword [ebp - 0x158], 0x11c
call dword [sym.imp.KERNEL32.dll_GetVersionExW]
test eax, eax
je 0x402468
mov eax, dword [0x425db8]
test al, 1
jne 0x40227f
or eax, 1
mov dword [0x425db8], eax
xor eax, eax
push 0x417ea0
mov dword [0x425d9c], 7
mov dword [0x425d98], 0
mov word [0x425d88], ax
call fcn.00408a59
add esp, 4
mov eax, dword [ebp - 0x154]
mov esi, 0x425d88
sub eax, 4
je 0x40236b
dec eax
je 0x40230e
dec eax
je 0x4022ac
push 7
push str.UnKnown
mov ecx, esi
call fcn.00403420
jmp case.default.0x4022bb
mov eax, dword [ebp - 0x150]
cmp eax, 3
ja case.default.0x4022bb
jmp dword [eax*4 + 0x402484]
cmp byte [ebp - 0x3e], 1
mov ecx, esi
jne 0x4022d4
push str.Microsoft_Windows_Vista
jmp 0x4023ab
push str.Microsoft_Windows_Server_2008
jmp 0x4023ab
cmp byte [ebp - 0x3e], 1
mov ecx, esi
jne 0x4022f0
push str.Microsoft_Windows_7
jmp 0x4023ab
push str.Microsoft_Windows_Server_2008_R2
jmp 0x4023ab
push str.Microsoft_Windows_8
jmp 0x4023a9
push str.Microsoft_Windows_8.1
jmp 0x4023a9
mov eax, dword [ebp - 0x150]
sub eax, 0
je 0x402364
dec eax
je 0x40235d
dec eax
jne case.default.0x4022bb
cmp byte [ebp - 0x3e], 1
jne 0x402337
cmp word [ebp - 0x34], 9
jne 0x402337
push str.Microsoft_Windows_XP_Professional_x64_Edition
jmp 0x4023a9
push 0x59
call dword [sym.imp.USER32.dll_GetSystemMetrics]
test eax, eax
jne 0x40234a
push str.Microsoft_Windows_Server_2003
jmp 0x4023a9
push 0x59
call dword [sym.imp.USER32.dll_GetSystemMetrics]
test eax, eax
je case.default.0x4022bb
push str.Microsoft_Windows_Server_2003_R2
jmp 0x4023a9
push str.Microsoft_Windows_XP
jmp 0x4023a9
push str.Microsoft_Windows_2000
jmp 0x4023a9
mov eax, dword [ebp - 0x150]
test eax, eax
je 0x40238d
cmp eax, 0xa
je 0x402386
cmp eax, 0x5a
jne case.default.0x4022bb
push str.Microsoft_Windows_Me
jmp 0x4023a9
push str.Microsoft_Windows_98
jmp 0x4023a9
mov eax, dword [ebp - 0x148]
cmp eax, 2
jne 0x40239f
push str.Microsoft_Windows_NT_4.0
jmp 0x4023a9
cmp eax, 1
jne case.default.0x4022bb
push str.Microsoft_Windows_95
mov ecx, esi
call fcn.004033d0
push 0
push ecx
push dword [0x425d98]
push ecx
mov ecx, esi
call fcn.00403c20
test eax, eax
jne 0x4023d3
push 7
push str.UnKnown
mov ecx, esi
call fcn.00403420
push 0x41f13c
mov edx, esi
lea ecx, [ebp - 0x188]
call fcn.00403950
lea ecx, [ebp - 0x144]
push ecx
mov edx, eax
lea ecx, [ebp - 0x170]
mov dword [ebp - 4], 0
call fcn.00403a40
add esp, 8
mov ecx, esi
push eax
call fcn.00403320
cmp dword [ebp - 0x15c], 8
jb 0x402422
push dword [ebp - 0x170]
call fcn.00408a9d
add esp, 4
xor eax, eax
cmp dword [ebp - 0x174], 8
mov dword [ebp - 0x15c], 7
mov dword [ebp - 0x160], 0
mov word [ebp - 0x170], ax
jb 0x402456
push dword [ebp - 0x188]
call fcn.00408a9d
add esp, 4
cmp dword [0x425d9c], 8
cmovae esi, dword [0x425d88]
mov eax, esi
jmp 0x40246a
xor eax, eax
mov ecx, dword [ebp - 0xc]
mov dword fs:[0], ecx
pop ecx
pop esi
mov ecx, dword [ebp - 0x10]
xor ecx, ebp
call fcn.004082d3
mov esp, ebp
pop ebp
ret