Function at 0x1401b12d0
Capabilities:
Encode data using xor
Generate random numbers using a mersenne twister

Disassembly:
mov qword [rsp + 0x10], rbx
mov qword [rsp + 0x18], rsi
mov qword [rsp + 0x20], rdi
push rbp
push r12
push r15
lea rbp, [rsp - 0x1cc0]
mov eax, 0x1dc0
call fcn.140410240
sub rsp, rax
mov rax, qword [0x140542918]
xor rax, rsp
mov qword [rbp + 0x1cb0], rax
mov rsi, rcx
mov qword [rsp + 0x38], rcx
mov dword [rsp + 0x20], 0
call fcn.14040f9e1
mov dword [rsp + 0x28], eax
call fcn.14040f9e1
mov dword [rsp + 0x2c], eax
call fcn.14040f9e1
mov dword [rsp + 0x30], eax
call fcn.14040f9e1
mov dword [rsp + 0x34], eax
xorps xmm0, xmm0
movdqu xmmword [rsp + 0x40], xmm0
xor ecx, ecx
mov qword [rsp + 0x50], rcx
lea rbx, [rsp + 0x28]
mov rdx, qword [rsp + 0x48]
cmp rdx, rcx
je 0x1401b136c
mov eax, dword [rbx]
mov dword [rdx], eax
add rdx, 4
mov qword [rsp + 0x48], rdx
jmp 0x1401b1383
mov r8, rbx
lea rcx, [rsp + 0x40]
call fcn.14013dd00
mov rcx, qword [rsp + 0x50]
mov rdx, qword [rsp + 0x48]
add rbx, 4
lea rax, [rsp + 0x38]
cmp rbx, rax
jne 0x1401b1358
mov dword [rbp + 0x12e4], 0xffffffff
mov edx, 0x1571
mov dword [rsp + 0x64], edx
mov ecx, 1
nop dword [rax]
mov eax, edx
shr eax, 0x1e
xor eax, edx
imul edx, eax, 0x6c078965
add edx, ecx
mov dword [rsp + rcx*4 + 0x64], edx
inc rcx
cmp rcx, 0x270
jb 0x1401b13b0
lea r8, [rbp + 0x1cb0]
lea rdx, [rbp + 0x12f0]
lea rcx, [rsp + 0x40]
call fcn.140144360
xor ebx, ebx
xor edi, edi
mov r8d, 0x9c0
lea rdx, [rbp + 0x12f0]
lea rcx, [rsp + 0x64]
call sub.VCRUNTIME140.dll_memcpy
nop dword [rax]
nop word [rax + rax]
mov eax, dword [rbp + rdi*4 + 0x12f0]
mov ecx, ebx
or ecx, eax
mov ebx, eax
shr ebx, 0x1f
test rdi, rdi
cmovne ebx, ecx
inc rdi
cmp rdi, 0x270
jb 0x1401b1410
mov eax, dword [rsp + 0x64]
mov ecx, 0x80000000
test ebx, ebx
cmove eax, ecx
mov dword [rsp + 0x64], eax
mov ebx, 0x270
mov dword [rsp + 0x60], ebx
xorps xmm0, xmm0
movups xmmword [rsi], xmm0
mov qword [rsi + 0x10], 0
mov qword [rsi + 0x18], 0
mov r8d, Ordinal_27
lea rdx, str.__cpp_httplultipart_data_
mov rcx, rsi
call fcn.14013c770
mov dword [rsp + 0x20], 1
mov edi, reloc.WS2_32.dll_recv
movabs r15, 0x842108421084211
lea r12, [0x140438c00]
cmp ebx, 0x270
jne 0x1401b14f5
lea rax, [rsp + 0x68]
mov r9d, ebx
nop word [rax + rax]
mov r8d, dword [rax - 4]
xor r8d, dword [rax]
btr r8d, 0x1f
xor r8d, dword [rax - 4]
mov ecx, r8d
and cl, 1
neg cl
sbb edx, edx
and edx, 0x9908b0df
xor edx, dword [rax + 0x630]
shr r8d, 1
xor edx, r8d
mov dword [rax + 0x9bc], edx
lea rax, [rax + 4]
sub r9, 1
jne 0x1401b14b0
mov ebx, dword [rsp + 0x60]
jmp 0x1401b15df
cmp ebx, 0x4e0
jb 0x1401b15df
xor r8d, r8d
nop dword [rax]
nop dword [rax + rax]
mov edx, dword [rbp + r8*4 + 0x924]
xor edx, dword [rbp + r8*4 + 0x928]
btr edx, 0x1f
xor edx, dword [rbp + r8*4 + 0x924]
mov eax, edx
and al, 1
neg al
sbb ecx, ecx
and ecx, 0x9908b0df
xor ecx, dword [rbp + r8*4 + 0xf58]
shr edx, 1
xor ecx, edx
mov dword [rsp + r8*4 + 0x64], ecx
inc r8
cmp r8, 0xe3
jb 0x1401b1510
mov r8d, 0xe3
nop dword [rax]
mov edx, dword [rbp + r8*4 + 0x924]
xor edx, dword [rbp + r8*4 + 0x928]
btr edx, 0x1f
xor edx, dword [rbp + r8*4 + 0x924]
mov eax, edx
and al, 1
neg al
sbb ecx, ecx
and ecx, 0x9908b0df
xor ecx, dword [rbp + r8*4 - 0x428]
shr edx, 1
xor ecx, edx
mov dword [rsp + r8*4 + 0x64], ecx
inc r8
cmp r8, 0x26f
jb 0x1401b1560
mov edx, dword [rbp + 0x12e0]
xor edx, dword [rsp + 0x64]
btr edx, 0x1f
xor edx, dword [rbp + 0x12e0]
mov eax, edx
and al, 1
neg al
sbb ecx, ecx
and ecx, 0x9908b0df
shr edx, 1
xor ecx, edx
xor ecx, dword [rbp + 0x594]
mov dword [rbp + 0x920], ecx
xor ebx, ebx
mov dword [rsp + 0x60], ebx
mov eax, ebx
mov ecx, dword [rsp + rax*4 + 0x64]
inc ebx
mov dword [rsp + 0x60], ebx
mov eax, ecx
shr eax, 0xb
and eax, dword [rbp + 0x12e4]
xor ecx, eax
mov eax, ecx
and eax, 0xff3a58ad
shl eax, 7
xor ecx, eax
mov eax, ecx
and eax, 0xffffdf8c
shl eax, 0xf
xor ecx, eax
mov eax, ecx
shr eax, 0x12
xor ecx, eax
mov rax, r15
mul rcx
mov eax, ecx
sub rax, rdx
shr rax, 1
add rax, rdx
shr rax, 5
imul rax, rax, 0x3e
sub rcx, rax
movzx r9d, byte [rcx + r12]
mov rcx, qword [rsi + 0x10]
mov rdx, qword [rsi + 0x18]
cmp rcx, rdx
jae 0x1401b1664
lea rax, [rcx + 1]
mov qword [rsi + 0x10], rax
mov rax, rsi
cmp rdx, 0x10
jb 0x1401b1659
mov rax, qword [rsi]
mov byte [rax + rcx], r9b
mov byte [rax + rcx + 1], 0
jmp 0x1401b1673
xor r8d, r8d
lea edx, [r8 + 1]
mov rcx, rsi
call fcn.140140e50
sub rdi, 1
jne 0x1401b1496
mov rcx, qword [rsp + 0x40]
test rcx, rcx
je 0x1401b16c0
mov rdx, qword [rsp + 0x50]
sub rdx, rcx
and rdx, 0xfffffffffffffffc
mov rax, rcx
cmp rdx, 0x1000
jb 0x1401b16bb
add rdx, 0x27
mov rcx, qword [rcx - 8]
sub rax, rcx
add rax, 0xfffffffffffffff8
cmp rax, 0x1f
jbe 0x1401b16bb
call qword [sym.imp.api_ms_win_crt_runtime_l1_1_0.dll__invalid_parameter_noinfo_noreturn]
int3
call fcn.14040fbd0
mov rax, rsi
mov rcx, qword [rbp + 0x1cb0]
xor rcx, rsp
call fcn.14040ff40
lea r11, [rsp + 0x1dc0]
mov rbx, qword [r11 + 0x28]
mov rsi, qword [r11 + 0x30]
mov rdi, qword [r11 + 0x38]
mov rsp, r11
pop r15
pop r12
pop rbp
ret