网马解密大讲堂——网马解密中级篇006(Base64篇)

roxiel · 发表于 2009-8-20 11:47

本帖最后由 roxiel 于 2009-8-20 11:49 编辑

by kongzi

一. Base64加密原理：(摘自小聪大牛的博客)

  把每三个字符，共24位2进制的ASCII码，折分成连续4个6位的ASCII码，再在每个ASCII码前面补00变成8位，最后对应一个码表来变成编码字符：

码表为（从0～63分别依次对应）：
0对应A………………………………………………………………………………63对应/
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
如果最后不够3位数，则补0，这时后面对应的编码是“=”
例：原文：             a                b             c
　 ASCII码： 01100001 | 01100010 | 01100011
   分成4个： 011000 | 010110 | 001001 | 100011
   补足位数： 00011000 | 00010110 | 00001001 | 00100011
   数值大小：       24             22             9                35
   对应编码：       Y                W             J                j
   编码结果： YWJj

      如果只有ab两个字符，则第三个字符用全0来代替，这时结果为YWI=
      其实按照算法，=对应的编码其实也可以认为是为0，所以QQ==和QQAA用来解密的话，都是A，但是后面补0时用“=”是加密算法自己的设置，所以加密结果只能是QQ==而不会是QQAA
知道了加密原理，解密原理就反其道而行之就行了，呵呵……

二.  加密特征：

大小写字母及数字混排，末尾可能包含等号

三. Base64解密方法：

我们还是以一个实例来简单讲解base64解密方法，在实际的网马解密中，这种加密方式很少见。今天我们提供一种解密的方法，
在这里用到的解密工具为：notepad++ 这个软件(附件为notepad++)。后续我们还会讲解使用一些其他的解密工具来解密base64。

npp_5.4.5.0.rar (2.83 MB, 下载次数: 571)

我们来看一个base64的源代码：

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

将上述代码复制粘贴到notepad++，详细步骤参看下例截图：

接下来ctrl+a选中代码，
点击TextFX菜单下TextFXTools下的Base64 Decode后，
点击file下的save as(另存为)，将代码保存为扩展名为txt(文件名任意)的文件。
直接打开保存好的文档即可看到解密后的内容。

最终的解密结果相见下图，红色框中内容均为病毒的下载地址(可能已失效)：

噢麦噶 · 发表于 2009-8-24 14:52

好东西是要拿出来分享学习

xieyuzhe · 发表于 2009-9-11 17:40

你这样的东西对付一些网络封包有帮助吗？

DieEarst · 发表于 2009-9-21 10:31

学习了..

谢谢楼主

xiaoshut · 发表于 2010-4-14 17:36

只会操作啊。。。

fvs · 发表于 2010-8-28 00:15

真的感谢你的东西非常好

royzua · 发表于 2010-10-27 01:11

感谢52pojie的团队和所有乐于奉献的朋友，希望52pojie越做越好。。。

farmem · 发表于 2011-1-11 22:19

支持感谢学习中您辛苦了

sixsung · 发表于 2011-4-10 13:26

感谢啊，好贴

jpi000 · 发表于 2011-4-23 18:20

膜拜楼主。。

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