{"id":1553,"date":"2022-10-18T19:29:31","date_gmt":"2022-10-18T11:29:31","guid":{"rendered":"https:\/\/www.zhiwanyuzhou.com\/?p=1553"},"modified":"2022-10-18T19:29:31","modified_gmt":"2022-10-18T11:29:31","slug":"%e4%b8%8d%e5%90%8c%e5%b9%b3%e5%8f%b0%e6%9e%b6%e6%9e%84upx%e6%89%8b%e5%b7%a5%e5%af%bb%e6%89%beoep%e5%b0%8f%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.zhiwanyuzhou.com\/index.php\/2022\/10\/18\/%e4%b8%8d%e5%90%8c%e5%b9%b3%e5%8f%b0%e6%9e%b6%e6%9e%84upx%e6%89%8b%e5%b7%a5%e5%af%bb%e6%89%beoep%e5%b0%8f%e8%ae%b0\/","title":{"rendered":"\u4e0d\u540c\u5e73\u53f0\u67b6\u6784UPX\u624b\u5de5\u5bfb\u627eOEP\u5c0f\u8bb0"},"content":{"rendered":"\n

\u4e00\u3001\u7b80\u4ecb<\/h2>\n\n\n\n

UPX (the Ultimate Packer for eXecutables)\u662f\u4e00\u6b3e\u5148\u8fdb\u7684\u53ef\u6267\u884c\u7a0b\u5e8f\u6587\u4ef6\u538b\u7f29\u5668\uff0c\u538b\u7f29\u8fc7\u7684\u53ef\u6267\u884c\u6587\u4ef6\u4f53\u79ef\u7f29\u5c0f50%-70% \uff0c\u8fd9\u6837\u51cf\u5c11\u4e86\u78c1\u76d8\u5360\u7528\u7a7a\u95f4\u3001\u7f51\u7edc\u4e0a\u4f20\u4e0b\u8f7d\u7684\u65f6\u95f4\u548c\u5176\u5b83\u5206\u5e03\u4ee5\u53ca\u5b58\u50a8\u8d39\u7528\u3002 \u901a\u8fc7 UPX \u538b\u7f29\u8fc7\u7684\u7a0b\u5e8f\u548c\u7a0b\u5e8f\u5e93\u5b8c\u5168\u6ca1\u6709\u529f\u80fd\u635f\u5931\u548c\u538b\u7f29\u4e4b\u524d\u4e00\u6837\u53ef\u6b63\u5e38\u5730\u8fd0\u884c\uff0c\u5bf9\u4e8e\u652f\u6301\u7684\u5927\u591a\u6570\u683c\u5f0f\u6ca1\u6709\u8fd0\u884c\u65f6\u95f4\u6216\u5185\u5b58\u7684\u4e0d\u5229\u540e\u679c\u3002 UPX \u652f\u6301\u8bb8\u591a\u4e0d\u540c\u7684\u53ef\u6267\u884c\u6587\u4ef6\u683c\u5f0f \u5305\u542b Windows 95\/98\/ME\/NT\/2000\/XP\/CE \u7a0b\u5e8f\u548c\u52a8\u6001\u94fe\u63a5\u5e93\u3001DOS \u7a0b\u5e8f\u3001 Linux \u53ef\u6267\u884c\u6587\u4ef6\u548c\u6838\u5fc3\u3002<\/p>\n\n\n\n

\u5bf9\u4e8e\u53ef\u6267\u884c\u7a0b\u5e8f\u8d44\u6e90\u538b\u7f29,\u662f\u4fdd\u62a4\u6587\u4ef6\u7684\u5e38\u7528\u624b\u6bb5. \u4fd7\u79f0\u52a0\u58f3,\u52a0\u58f3\u8fc7\u7684\u7a0b\u5e8f\u53ef\u4ee5\u76f4\u63a5\u8fd0\u884c,\u4f46\u662f\u4e0d\u80fd\u67e5\u770b\u6e90\u4ee3\u7801.\u8981\u7ecf\u8fc7\u8131\u58f3\u624d\u53ef\u4ee5\u67e5\u770b\u6e90\u4ee3\u7801\u3002<\/p>\n\n\n\n

\u5176\u5b9e\u662f\u5229\u7528\u7279\u6b8a\u7684\u7b97\u6cd5\uff0c\u5bf9EXE\u3001DLL\u6587\u4ef6\u91cc\u7684\u8d44\u6e90\u8fdb\u884c\u538b\u7f29\u3002\u7c7b\u4f3cWINZIP \u7684\u6548\u679c\uff0c\u53ea\u4e0d\u8fc7\u8fd9\u4e2a\u538b\u7f29\u4e4b\u540e\u7684\u6587\u4ef6\uff0c\u53ef\u4ee5\u72ec\u7acb\u8fd0\u884c\uff0c\u89e3\u538b\u8fc7\u7a0b\u5b8c\u5168\u9690\u853d\uff0c\u90fd\u5728\u5185\u5b58\u4e2d\u5b8c\u6210\u3002\u89e3\u538b\u539f\u7406\uff0c\u662f\u52a0\u58f3\u5de5\u5177\u5728\u6587\u4ef6\u5934\u91cc\u52a0\u4e86\u4e00\u6bb5\u6307\u4ee4\uff0c\u544a\u8bc9CPU\uff0c\u600e\u4e48\u624d\u80fd\u89e3\u538b\u81ea\u5df1\u3002\u5f53\u52a0\u58f3\u65f6\uff0c\u5176\u5b9e\u5c31\u662f\u7ed9\u53ef\u6267\u884c\u7684\u6587\u4ef6\u52a0\u4e0a\u4e2a\u5916\u8863\u3002\u7528\u6237\u6267\u884c\u7684\u53ea\u662f\u8fd9\u4e2a\u5916\u58f3\u7a0b\u5e8f\u3002\u5f53\u6267\u884c\u8fd9\u4e2a\u7a0b\u5e8f\u7684\u65f6\u5019\u8fd9\u4e2a\u58f3\u5c31\u4f1a\u628a\u539f\u6765\u7684\u7a0b\u5e8f\u5728\u5185\u5b58\u4e2d\u89e3\u5f00\uff0c\u89e3\u5f00\u540e\uff0c\u4ee5\u540e\u7684\u5c31\u4ea4\u7ed9\u771f\u6b63\u7684\u7a0b\u5e8f\u3002<\/p>\n\n\n\n

EP(Entry Point)\uff0c\u610f\u5373\u7a0b\u5e8f\u7684\u5165\u53e3\u70b9\u3002\u800cOEP\u662f\u7a0b\u5e8f\u7684\u539f\u59cb\u5165\u53e3\u70b9\uff0c\u4e00\u4e2a\u6b63\u5e38\u7684\u7a0b\u5e8f\u53ea\u6709EP\uff0c\u53ea\u6709\u5165\u53e3\u70b9\u88ab\u4fee\u6539\u7684\u7a0b\u5e8f(\u52a0\u58f3\u7b49)\uff0c\u624d\u4f1a\u62e5\u6709OEP\u3002<\/p>\n\n\n\n

\u4e8c\u3001\u51c6\u5907\u5de5\u4f5c<\/h2>\n\n\n\n

\u8fd0\u884c\u73af\u5883\uff1a<\/p>\n\n\n\n

1\u3001Windows 7 x64
gcc\uff08mingw\uff09
OllyDBG
Ghidra

2\u3001Ubuntu 20.04
sudo apt install -y upx gcc-arm-linux-gnueabihf gcc-mips-linux-gnu gdb gdb-multiarch qemu-user<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u6211\u4eec\u51c6\u5907\u4e00\u6bb5\u7b80\u5355\u7684\u4ee3\u7801\uff0c\u4e0b\u9762\u662f\u7ecf\u5178\u7684helloworld\u4ee3\u7801\uff1a<\/p>\n\n\n\n

#include <stdio.h>\r\n#include <stdlib.h>\r\n\r\nint main(int argc, char *argv)\r\n{\r\n    printf(\"hello world\\n\");\r\n    return 0;\r\n}<\/code><\/pre>\n\n\n\n
\u7f16\u8bd1\u4e0d\u540c\u67b6\u6784\u7684\u7a0b\u5e8f<\/p>\n\n\n\n
\u5e8f\u53f7<\/td>\u5e73\u53f0\u67b6\u6784<\/td>\u53c2\u6570<\/td><\/tr>
1<\/td>Windows x86<\/td>gcc helloworld.c -o hello.exe<\/td><\/tr>
2<\/td>Linux x86<\/td>gcc helloworld.c -o hello.x86 -m32 -static<\/td><\/tr>
3<\/td>Linux arm32<\/td>arm-linux-gnueabihf-gcc helloworld.c -o hello.arm32 -static<\/td><\/tr>
4<\/td>Linux mips32<\/td>mips-linux-gnu-gcc helloworld.c -o hello.mips32 -static<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u4f7f\u7528upx\u7ed9\u7f16\u8bd1\u597d\u7684\u7a0b\u5e8f\u8fdb\u884c\u52a0\u58f3\u64cd\u4f5c\uff0c\u547d\u4ee4\uff1aupx -1 \u6587\u4ef6\u540d -o \u65b0\u6587\u4ef6\u540d<\/p>\n\n\n\n
# upx -h\r\n                       Ultimate Packer for eXecutables\r\n                          Copyright (C) 1996 - 2018\r\nUPX 3.95        Markus Oberhumer, Laszlo Molnar & John Reiser   Aug 26th 2018\r\n\r\nUsage: upx [-123456789dlthVL] [-qvfk] [-o file] file..\r\n\r\nCommands:\r\n  -1     compress faster                   -9    compress better\r\n  --best compress best (can be slow for big files)\r\n  -d     decompress                        -l    list compressed file\r\n  -t     test compressed file              -V    display version number\r\n  -h     give this help                    -L    display software license<\/code><\/pre>\n\n\n\n
\u4e09\u3001\u624b\u5de5\u5bfb\u627eOEP<\/h2>\n\n\n\n
1\u3001Windows\u5e73\u53f0<\/h4>\n\n\n\n
\u901a\u5e38\u624b\u52a8\u8131\u58f3\uff0c\u53ef\u4ee5\u91c7\u7528\u5806\u6808\u5e73\u8861\u6cd5\uff0c\u4f7f\u7528OD\u8c03\u8bd5\uff0c\u627e\u5230PUSHAD\uff08\u628a\u4eceEAX\u5230EDI\u5bc4\u5b58\u5668\u538b\u5165\u5806\u6808\uff0c\u4fdd\u5b58\u73b0\u573a\uff09<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4f7f\u7528\u5355\u6b65\u6cd5\uff0c\u5148\u4e00\u6b65\u6b65\u5411\u4e0b\u67e5\u770b\uff0c\u76f4\u5230\u627e\u5230POPAD\u8bed\u53e5\u51fa\u73b0\u7684\u5730\u65b9\uff0c\u56e0\u4e3a\u4e00\u822cUPX\u58f3\u90fd\u662f\u52a0\u5728\u539f\u7a0b\u5e8f\u7684\u4e0a\u65b9\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u627e\u5230\u4e00\u4e2a\u5927\u8df3\u8f6c\uff0cjmp<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u8df3\u8fc7\u53bb\uff0c\u627e\u5230\u5165\u53e3\u70b9<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u6700\u540e\u4e0e\u539f\u59cb\u7a0b\u5e8f\u5bf9\u6bd4\uff0c\u7684\u786e\u662fOEP\uff0c\u662f_mainCRTStartup\u51fd\u6570\u7684\u5f00\u5934\u3002<\/p>\n\n\n\n
2\u3001Linux x86\u5e73\u53f0<\/h4>\n\n\n\n
\u9996\u5148\u6211\u4eec\u7528readelf\u67e5\u770b\u5165\u53e3\u70b9\uff1a0x8093718<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4e0eWindows\u7684\u8131\u58f3\u65b9\u5f0f\u7c7b\u4f3c\uff0c\u4e5f\u662f\u627epushad\u3001popad\uff0c\u4e0d\u8fc7Linux\u4e0a\u663e\u793a\u7684\u662fpusha\u3001popa\uff0c\u4f7f\u7528gdb\u8c03\u8bd5\uff0c\u5728\u5165\u53e3\u70b9\u4e0b\u65ad\u70b9<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u6211\u4eec\u627e\u5230\u540e\u9762\u7684popa\uff0c\u4e0b\u4e2a\u65ad\u70b9\uff0c\u5982\u679c\u6709\u591a\u4e2apopa\uff0c\u53ef\u4ee5\u4e0b\u591a\u4e2a\u65ad\u70b9\uff0c\u53ef\u4ee5\u914d\u5408\u9759\u6001\u53cd\u7f16\u8bd1\u5de5\u5177\u8fdb\u884c\u67e5\u627e\uff0c\u6700\u7ec8\u65ad\u4e0b\u6765<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u6765\u5230\u4e86\u4e00\u4e2a\u51fd\u6570\uff0c\u5728\u672b\u5c3e\u6709\u4e2ajmp edx\uff0c\u53ef\u4ee5\u786e\u5b9a\u5b83\u8fdb\u884c\u4e86\u4e00\u4e9b\u64cd\u4f5c<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u8ddf\u8fdb\uff0c\u53d1\u73b0\u662f\u4e00\u4e2a\u51fd\u6570<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4f7f\u7528\u547d\u4ee4x\/1024i $pc\u67e5\u770b\u591a\u884c\u6c47\u7f16\u4ee3\u7801\uff0c\u627e\u5230\u4e00\u4e2a\u5927\u8df3\u8f6c\u7684\u5730\u65b9\uff0c\u8df3\u8f6c\u5730\u5740edi\u662f\u52a8\u6001\u751f\u6210\u7684\uff0c\u57fa\u672c\u53ef\u4ee5\u786e\u5b9a\u505a\u4e86\u4e00\u4e9b\u64cd\u4f5c<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4e0b\u65ad\u70b9\uff0c\u8fdb\u5165\uff0c\u627e\u5230\u4e86\u6700\u540e\u7684ini 80\u4e2d\u65ad\u548cpopa<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u7ee7\u7eed\u5355\u6b65\u5230ret<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u5bf9\u6bd4\u539f\u59cb\u7a0b\u5e8f\uff0c\u8fd9\u91cc\u5c31\u662f\u5b9e\u9645\u7a0b\u5e8f\u7684\u5165\u53e3\u70b9<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u67e5\u770b\u7a0b\u5e8f\u7684map<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
dump\u51fa\u73b0\u5728\u7684\u5185\u5b58\uff0c\u53ef\u4ee5\u7528\u4e8e\u9759\u6001\u5206\u6790\uff08\u65e0\u6cd5\u8fd0\u884c\u7684\uff0c\u5982\u679c\u60f3\u8981\u8fd0\u884c\uff0c\u5f97\u4fee\u590d\u533a\u6bb5\uff0c\u8fd9\u91cc\u6682\u65f6\u4e0d\u518d\u5206\u6790\uff09<\/p>\n\n\n\n
(gdb) dump memory hello.x86.dump 0x8048000 0x80e7000<\/code><\/pre>\n\n\n\n
3\u3001Linux arm\u5e73\u53f0<\/h4>\n\n\n\n
\u76f8\u6bd4x86\u67b6\u6784\uff0carm\u67b6\u6784\u5e76\u6ca1\u6709pushad\u3001popad\uff0c\u53ea\u80fd\u8fdb\u884c\u7b80\u5355\u7684\u5bc4\u5b58\u5668\u64cd\u4f5c\uff0c\u53ef\u662f\u4e0d\u7ba1\u600e\u6837\uff0c\u90fd\u5e94\u8be5\u6709\u4e00\u4e2a\u7279\u5f81\uff1a\u51fa\u73b0\u5927\u8df3\u8f6c\u4e4b\u540e\u5c31\u63a5\u8fd1\u539f\u59cb\u7684OEP\u4e86\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u5bf9\u4e8eARM\u67b6\u6784\u6765\u8bf4\uff0c\u5927\u8df3\u8f6c\u4e00\u822c\u4e0d\u4f1a\u91c7\u7528BL\u8fd9\u6837\u7684\u51fd\u6570\u8df3\u8f6c\u65b9\u5f0f\uff0c\u8981\u4e0d\u5c31\u662f\u4f7f\u7528pop {xx, pc}\uff0c\u6216\u8005add pc, xx, xx\u3001ldr pc, xx\u3001mov pc, xx\u7b49\u65b9\u5f0f\uff0c\u4ee5\u4e0b\u662fGhidra\u627e\u5230\u7684\u53ef\u7591\u8df3\u8f6c\uff08\u5176\u5b9e\u901a\u8fc7flags=0x7d\u3001len=0x5\u8fd9\u91cc\u53ef\u4ee5\u5224\u65ad\u51fa\u6765\u662fsys_protect\u7cfb\u7edf\u8c03\u7528\u7684\u4e00\u4e2a\u53c2\u6570\uff09<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4f7f\u7528qemu-arm\u548cgdb-multiarch\u8fdb\u884c\u8c03\u8bd5\uff0c\u9996\u5148\u4e0b\u65ad\u70b90x4353c<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4f7f\u7528\u547d\u4ee4x\/1024i $pc\u67e5\u770b\u591a\u884c\u6c47\u7f16\u4ee3\u7801\uff0c\u627e\u5230\u80fd\u591f\u8bbf\u95ee\u7684\u5185\u5b58\u672b\u5c3e\uff0c\u6700\u7ec8\u627e\u5230\u4e00\u4e2apop {xx, pc}<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u57280xff7eefe0\u4e0b\u65ad\u70b9\uff0c\u5e76\u5355\u6b65\u6b65\u8fc7\uff0c\u67e5\u770b\u5185\u5b58\u627e\u5230\u4e00\u4e2aldr pc, xx\u7684\u8df3\u8f6c<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4e0b\u65ad\u70b9\u5e76\u5355\u6b65\u6b65\u8fc7\uff0c\u6700\u7ec8\u6765\u5230\u4e3b\u7a0b\u5e8f\u7684\u5730\u5740\u8303\u56f4<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u7ee7\u7eed\u5355\u6b65\u6b65\u8fc7\uff0c\u6700\u7ec8\u6765\u5230\u4e00\u4e2a\u5730\u57400x10328\uff0c\u4e0e\u539f\u59cb\u7a0b\u5e8f\u5bf9\u6bd4\u53ef\u77e5\u662f\u5165\u53e3\u70b9<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u540e\u9762\u7684\u8131\u58f3\u4e0elinux x86\u7c7b\u4f3c\uff0c\u8fd9\u91cc\u4e0d\u518d\u8d58\u8ff0\u3002<\/p>\n\n\n\n
4\u3001Linux mips\u5e73\u53f0<\/h4>\n\n\n\n
\u4e0earm\u5e73\u53f0\u7c7b\u4f3c\uff0c\u90fd\u662f\u4f7f\u7528\u5bc4\u5b58\u5668\u76f4\u63a5\u8df3\u8f6c\u7684\uff0c\u90a3\u4e48\u627e\u5bc4\u5b58\u5668pc\u64cd\u4f5c\u7684\u5730\u65b9\u5c31\u884c\uff0c\u540c\u65f6\u627e\u5230len=0x5\u7684\u5730\u65b9\uff0c\u5e94\u8be5\u5c31\u662f\u8c03\u7528\u5730\u70b9\uff0c\u6700\u7ec8\u627e\u52300x4468b0<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4f7f\u7528qemu-mips\u548cgdb-multiarch\u8fdb\u884c\u8c03\u8bd5<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u5355\u6b65\u6b65\u8fc7<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
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\"\"<\/figure>\n\n\n\n
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\"\"<\/figure>\n\n\n\n
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\"\"<\/figure>\n\n\n\n
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\"\"<\/figure>\n\n\n\n
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upx -d \u6587\u4ef6\u540d -o \u65b0\u6587\u4ef6\u540d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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\"\"<\/figure>\n\n\n\n
\u4e94\u3001\u53c2\u8003\u94fe\u63a5<\/h2>\n\n\n\n
https:\/\/baike.baidu.com\/item\/upx\/4630968<\/a><\/p>\n\n\n\n
https:\/\/blog.csdn.net\/qq_41426887\/article\/details\/90552292<\/a><\/p>\n\n\n\n
https:\/\/baike.baidu.com\/item\/OEP\/4885720<\/a><\/p>\n\n\n\n
https:\/\/github.com\/upx\/upx<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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