EXTORY Intrinsics Challenge => https://www.virustotal.com/gui/file/7db71da650e096af7d351b03005593a368e75de8bb69d1761d30d7fd3a59708b/detection

extory_solver.py

def decrypt_debug_strings():
	e_array = [bytes.fromhex('a100ef00ed00bd00bb00be00f700bc00a100bc'), bytes.fromhex('8d00b800aa00b200b400be00ab00f700bc00a100bc'),
		bytes.fromhex('b000bd00b800ef00ed00f700bc00a100bc0000'), bytes.fromhex('b300b800af00b800ae00f700bc00a100bc0000')]
	n = 0
	d_bytes = ''
	
	for encrypted_string in range(len(e_array)):
		for _ in range(len(e_array[encrypted_string]) - 10):
			d_bytes += chr(e_array[encrypted_string][n] ^ 0xD9)
			n += 2
		d_bytes += chr(0xA)
		n = 0
		
	return d_bytes


def decrypt_response():
	rand_ascii_array = ["hgblelelbkjjgldd", "hielblaldkdd"]
	n = 0 
	d_bytes = ''
	
	for i in range(len(rand_ascii_array)):
		for _ in range(int(len(rand_ascii_array[i]) / 2)):
			tmp_byte = (((ord(rand_ascii_array[i][n+1]) << 2) + ord(rand_ascii_array[i][n+1])) * 2) + ord(rand_ascii_array[i][n])
			d_bytes += chr(tmp_byte - 0x42B)
			n += 2
		d_bytes += chr(0xA)
		n = 0
		
	return d_bytes


def solve(input):
	e_input = bytearray(16)
	output = bytearray(16)

	key = bytes.fromhex('a500cd00b600a400e000c500c600c600af00ab00aa00fc00c400d000ec00d600')

	for i in range(len(input)):
		e_input[i] = input[i] ^ 0xCD

	n = 0
	for i in range(len(input)):
		output[i] = e_input[i] ^ key[n]
		n += 2

	return output


def main():
	d_bytes = decrypt_debug_strings()	
	print("Decrypted Debugger Strings!\n" + d_bytes)
	
	d_bytes = decrypt_response()
	print("\nDecrypted Responses\n" + d_bytes)

	hardcoded_input = bytes.fromhex("5D410A1C785A2E662A52137434444F22")
	password = solve(hardcoded_input)
	print("\nDecrypted Password =>")
	print(password)

	
if __name__ == '__main__':
	main()