Function at 0x140020900
Capabilities:
Get system information on windows
Make suspicious ntquerysysteminformation call
Parse pe header
Query environment variable
Resolve function by parsing pe exports

Disassembly:
mov byte [rsp + 0x18], r8b
mov qword [rsp + 0x10], rdx
mov qword [rsp + 8], rcx
sub rsp, 0x158
mov rax, qword [0x1400bf080]
xor rax, rsp
mov qword [rsp + 0x140], rax
mov qword [rsp + 0x28], 0
mov dword [rsp + 0xf8], 0
lea r9, [rsp + 0xf8]
mov r8d, dword [rsp + 0xf8]
mov rdx, qword [rsp + 0x28]
mov ecx, ntohs
call qword [sym.imp.ntdll.dll_NtQuerySystemInformation]
mov dword [rsp + 0x30], eax
cmp dword [rsp + 0x30], 0xc0000004
jne 0x1400209c5
mov r8d, 0x8000
xor edx, edx
mov rcx, qword [rsp + 0x28]
call qword [sym.imp.KERNEL32.dll_VirtualFree]
mov eax, dword [rsp + 0xf8]
mov r9d, 4
mov r8d, 0x3000
mov edx, eax
xor ecx, ecx
call qword [sym.imp.KERNEL32.dll_VirtualAlloc]
mov qword [rsp + 0x28], rax
lea r9, [rsp + 0xf8]
mov r8d, dword [rsp + 0xf8]
mov rdx, qword [rsp + 0x28]
mov ecx, ntohs
call qword [sym.imp.ntdll.dll_NtQuerySystemInformation]
mov dword [rsp + 0x30], eax
jmp 0x140020960
cmp dword [rsp + 0x30], 0
jge 0x1400209e6
mov r8d, 0x8000
xor edx, edx
mov rcx, qword [rsp + 0x28]
call qword [sym.imp.KERNEL32.dll_VirtualFree]
xor eax, eax
jmp 0x140020e6b
mov rax, qword [rsp + 0x28]
mov qword [rsp + 0x40], rax
mov dword [rsp + 0x20], 0
jmp 0x140020a04
mov eax, dword [rsp + 0x20]
inc eax
mov dword [rsp + 0x20], eax
mov rax, qword [rsp + 0x40]
mov eax, dword [rax]
cmp dword [rsp + 0x20], eax
jae 0x140020e56
mov eax, dword [rsp + 0x20]
imul rax, rax, 0x128
mov rcx, qword [rsp + 0x40]
lea rax, [rcx + rax + 8]
mov ecx, dword [rsp + 0x20]
imul rcx, rcx, 0x128
mov rdx, qword [rsp + 0x40]
movzx ecx, word [rdx + rcx + 0x2e]
lea rax, [rax + rcx + 0x28]
mov rdx, rax
lea rcx, [rsp + 0x120]
call fcn.14000a580
nop
lea rcx, [rsp + 0x120]
call fcn.14000a2c0
mov rdx, qword [rsp + 0x160]
mov rcx, rax
call qword [sym.imp.api_ms_win_crt_string_l1_1_0.dll__stricmp]
test eax, eax
jne 0x140020e44
mov eax, dword [rsp + 0x20]
imul rax, rax, 0x128
mov rcx, qword [rsp + 0x40]
lea rax, [rcx + rax + 0x30]
mov rdx, rax
lea rcx, [rsp + 0x100]
call fcn.14000a580
nop
lea rcx, str.SYSTEMROOT
call qword [sym.imp.api_ms_win_crt_environment_l1_1_0.dll_getenv]
mov rdx, rax
lea rcx, [rsp + 0xd8]
call fcn.14000a580
mov qword [rsp + 0x70], rax
mov rax, qword [rsp + 0x70]
mov qword [rsp + 0x78], rax
mov rax, qword [rsp + 0x78]
mov qword [rsp + 0x80], rax
lea rdx, [0x1400a7db8]
mov rcx, qword [rsp + 0x80]
call fcn.14000a310
mov qword [rsp + 0x88], rax
xor r8d, r8d
lea rdx, str.SystemRoot_
lea rcx, [rsp + 0x100]
call fcn.140019630
mov qword [rsp + 0x90], rax
mov r9, qword [rsp + 0x88]
mov r8d, ntohs
mov rdx, qword [rsp + 0x90]
lea rcx, [rsp + 0x100]
call fcn.1400197e0
nop
lea rcx, [rsp + 0xd8]
call fcn.140005600
lea rcx, [rsp + 0x100]
call fcn.14000a2c0
mov r8d, 1
xor edx, edx
mov rcx, rax
call qword [sym.imp.KERNEL32.dll_LoadLibraryExA]
mov qword [rsp + 0x38], rax
mov rax, qword [rsp + 0x38]
mov qword [rsp + 0x58], rax
mov rax, qword [rsp + 0x58]
movzx eax, word [rax]
cmp eax, 0x5a4d
je 0x140020bb6
mov qword [rsp + 0x98], 0
lea rcx, [rsp + 0x100]
call fcn.140005600
nop
lea rcx, [rsp + 0x120]
call fcn.140005600
mov rax, qword [rsp + 0x98]
jmp 0x140020e6b
mov rax, qword [rsp + 0x58]
movsxd rax, dword [rax + 0x3c]
mov rcx, qword [rsp + 0x38]
add rcx, rax
mov rax, rcx
mov qword [rsp + 0x50], rax
mov rax, qword [rsp + 0x50]
cmp dword [rax], 0x4550
je 0x140020c10
mov qword [rsp + 0xa0], 0
lea rcx, [rsp + 0x100]
call fcn.140005600
nop
lea rcx, [rsp + 0x120]
call fcn.140005600
mov rax, qword [rsp + 0xa0]
jmp 0x140020e6b
mov eax, 8
imul rax, rax, 0
mov rcx, qword [rsp + 0x50]
cmp dword [rcx + rax + 0x88], 0
jne 0x140020c5c
mov qword [rsp + 0xa8], 0
lea rcx, [rsp + 0x100]
call fcn.140005600
nop
lea rcx, [rsp + 0x120]
call fcn.140005600
mov rax, qword [rsp + 0xa8]
jmp 0x140020e6b
mov eax, 8
imul rax, rax, 0
mov rcx, qword [rsp + 0x50]
mov eax, dword [rcx + rax + 0x88]
mov rcx, qword [rsp + 0x38]
add rcx, rax
mov rax, rcx
mov qword [rsp + 0x48], rax
mov rax, qword [rsp + 0x48]
mov eax, dword [rax + 0x1c]
mov rcx, qword [rsp + 0x38]
add rcx, rax
mov rax, rcx
mov qword [rsp + 0x68], rax
mov rax, qword [rsp + 0x48]
mov eax, dword [rax + 0x20]
mov rcx, qword [rsp + 0x38]
add rcx, rax
mov rax, rcx
mov qword [rsp + 0xb0], rax
mov rax, qword [rsp + 0x48]
mov eax, dword [rax + 0x24]
mov rcx, qword [rsp + 0x38]
add rcx, rax
mov rax, rcx
mov qword [rsp + 0x60], rax
mov dword [rsp + 0x24], 0
jmp 0x140020ce0
mov eax, dword [rsp + 0x24]
inc eax
mov dword [rsp + 0x24], eax
mov rax, qword [rsp + 0x48]
mov eax, dword [rax + 0x1c]
cmp dword [rsp + 0x24], eax
jae 0x140020e36
movsxd rax, dword [rsp + 0x24]
mov rcx, qword [rsp + 0xb0]
mov eax, dword [rcx + rax*4]
mov rcx, qword [rsp + 0x38]
add rcx, rax
mov rax, rcx
mov rcx, qword [rsp + 0x168]
sub rax, rcx
movzx edx, byte [rcx]
cmp dl, byte [rcx + rax]
jne 0x140020d2b
inc rcx
test dl, dl
jne 0x140020d18
xor eax, eax
jmp 0x140020d30
sbb eax, eax
or eax, 1
test eax, eax
jne 0x140020e31
movzx eax, byte [rsp + 0x170]
test eax, eax
jne 0x140020dcb
mov eax, dword [rsp + 0x20]
imul rax, rax, 0x128
movsxd rcx, dword [rsp + 0x24]
mov rdx, qword [rsp + 0x60]
movzx ecx, word [rdx + rcx*2]
mov rdx, qword [rsp + 0x68]
mov ecx, dword [rdx + rcx*4]
mov rdx, qword [rsp + 0x40]
add rcx, qword [rdx + rax + 0x18]
mov rax, rcx
mov qword [rsp + 0xb8], rax
mov r8d, 0x8000
xor edx, edx
mov rcx, qword [rsp + 0x28]
call qword [sym.imp.KERNEL32.dll_VirtualFree]
mov rax, qword [rsp + 0xb8]
mov qword [rsp + 0xc0], rax
lea rcx, [rsp + 0x100]
call fcn.140005600
nop
lea rcx, [rsp + 0x120]
call fcn.140005600
mov rax, qword [rsp + 0xc0]
jmp 0x140020e6b
movsxd rax, dword [rsp + 0x24]
mov rcx, qword [rsp + 0x60]
movzx eax, word [rcx + rax*2]
mov rcx, qword [rsp + 0x68]
mov eax, dword [rcx + rax*4]
mov qword [rsp + 0xc8], rax
mov r8d, 0x8000
xor edx, edx
mov rcx, qword [rsp + 0x28]
call qword [sym.imp.KERNEL32.dll_VirtualFree]
mov rax, qword [rsp + 0xc8]
mov qword [rsp + 0xd0], rax
lea rcx, [rsp + 0x100]
call fcn.140005600
nop
lea rcx, [rsp + 0x120]
call fcn.140005600
mov rax, qword [rsp + 0xd0]
jmp 0x140020e6b
jmp 0x140020cd6
lea rcx, [rsp + 0x100]
call fcn.140005600
nop
lea rcx, [rsp + 0x120]
call fcn.140005600
jmp 0x1400209fa
mov r8d, 0x8000
xor edx, edx
mov rcx, qword [rsp + 0x28]
call qword [sym.imp.KERNEL32.dll_VirtualFree]
xor eax, eax
mov rcx, qword [rsp + 0x140]
xor rcx, rsp
call fcn.14008a0e0
add rsp, 0x158
ret