Function at 0x180021c00
Capabilities:
Query environment variable
Resume thread
Terminate process

Disassembly:
push rbp
push rbx
push rsi
push rdi
push r12
push r14
push r15
lea rbp, [rsp - 0x410]
sub rsp, 0x510
mov rax, qword [0x1802609a8]
xor rax, rsp
mov qword [rbp + 0x400], rax
mov r15, r8
mov edi, edx
mov r14d, ecx
lea rdx, [rbp - 0x20]
xor ebx, ebx
lea rcx, str.WINDIR
mov r8d, 0x104
mov qword [rsp + 0x50], rbx
mov r12, r9
call qword [sym.imp.KERNEL32.dll_GetEnvironmentVariableW]
lea ecx, [rdi - 1]
mov esi, eax
cmp ecx, 0xfff
ja 0x180021e74
mov r9, r15
lea rcx, [rsp + 0x50]
mov r8d, edi
mov edx, r14d
call fcn.1800236e0
mov rdi, qword [rsp + 0x50]
test eax, eax
je 0x180021e65
lea eax, [rsi - 1]
cmp eax, 0x102
ja 0x180021e65
mov ecx, 0x104
lea rax, [rbp - 0x20]
nop dword [rax]
cmp word [rax], bx
je 0x180021caf
add rax, 2
sub rcx, 1
jne 0x180021ca0
mov eax, 0x104
sub rax, rcx
test rcx, rcx
cmove rax, rbx
je 0x180021e65
mov r8d, 0x104
lea rcx, [rbp - 0x20]
lea rcx, [rcx + rax*2]
sub r8, rax
je 0x180021d0f
add rax, 0x7ffffefa
lea r9, str._syswow64_rundll32.exe
add rax, r8
sub r9, rcx
nop word [rax + rax]
test rax, rax
je 0x180021d0f
movzx edx, word [r9 + rcx]
test dx, dx
je 0x180021d0f
mov word [rcx], dx
dec rax
add rcx, 2
sub r8, 1
jne 0x180021cf0
test r8, r8
lea rax, [rcx - 2]
cmovne rax, rcx
mov word [rax], bx
je 0x180021e65
lea r9, [rdi + 0xc]
mov edx, 0x104
lea r8, str.rundll32.exe___hs__1
lea rcx, [rbp + 0x1f0]
call fcn.180023be0
test eax, eax
js 0x180021e65
xorps xmm1, xmm1
mov dword [rsp + 0x70], 0x68
xor eax, eax
lea rdx, [rbp + 0x1f0]
mov qword [rsp + 0x68], rax
lea rcx, [rbp - 0x20]
mov dword [rbp - 0x2c], eax
xorps xmm0, xmm0
lea rax, [rsp + 0x58]
xor r9d, r9d
mov qword [rsp + 0x48], rax
xor r8d, r8d
lea rax, [rsp + 0x70]
mov qword [rsp + 0x40], rax
mov qword [rsp + 0x38], rbx
mov qword [rsp + 0x30], rbx
mov dword [rsp + 0x28], 4
mov dword [rsp + 0x20], ebx
movups xmmword [rsp + 0x58], xmm0
movups xmmword [rsp + 0x74], xmm1
movups xmmword [rbp - 0x7c], xmm1
movups xmmword [rbp - 0x6c], xmm1
movups xmmword [rbp - 0x5c], xmm1
movups xmmword [rbp - 0x4c], xmm1
movups xmmword [rbp - 0x3c], xmm1
call r12
test eax, eax
je 0x180021e65
mov r9d, dword [rdi]
lea rdx, [0x1801b9cd8]
mov rcx, qword [rsp + 0x58]
mov r8, rdi
call fcn.1800222f0
test eax, eax
jne 0x180021e06
mov rcx, qword [rsp + 0x58]
mov edx, 0xffffffff
call qword [sym.imp.KERNEL32.dll_TerminateProcess]
mov rcx, qword [rsp + 0x58]
call qword [sym.imp.KERNEL32.dll_CloseHandle]
mov rcx, qword [rsp + 0x60]
call qword [sym.imp.KERNEL32.dll_CloseHandle]
jmp 0x180021e65
mov rcx, qword [rsp + 0x60]
call qword [sym.imp.KERNEL32.dll_ResumeThread]
mov rcx, qword [rsp + 0x60]
call qword [sym.imp.KERNEL32.dll_ResumeThread]
mov rcx, qword [rsp + 0x58]
mov edx, 0xffffffff
call qword [sym.imp.KERNEL32.dll_WaitForSingleObject]
mov rcx, qword [rsp + 0x58]
lea rdx, [rsp + 0x50]
mov dword [rsp + 0x50], 0x1f4
call qword [sym.imp.KERNEL32.dll_GetExitCodeProcess]
mov rcx, qword [rsp + 0x58]
call qword [sym.imp.KERNEL32.dll_CloseHandle]
mov rcx, qword [rsp + 0x60]
call qword [sym.imp.KERNEL32.dll_CloseHandle]
cmp dword [rsp + 0x50], ebx
jne 0x180021e65
mov ebx, 1
test rdi, rdi
je 0x180021e7f
mov rcx, rdi
call fcn.18015dea8
jmp 0x180021e7f
mov ecx, 0x57
call qword [sym.imp.KERNEL32.dll_SetLastError]
mov eax, ebx
mov rcx, qword [rbp + 0x400]
xor rcx, rsp
call fcn.18015e5e0
add rsp, 0x510
pop r15
pop r14
pop r12
pop rdi
pop rsi
pop rbx
pop rbp
ret