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IT Security and Insecurity Portal |
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unescape decryption |
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 Posted: Mon Nov 16, 2009 11:00 am |
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| devinmason7711 |
| Beginner |
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| Joined: Nov 16, 2009 |
| Posts: 2 |
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hey guys I know how to decode unescape, but this is different...
<!--Advanced Unescape Start-->
<html>
<head><SCRIPT type="text/javascript">eval(unescape("function%20ew_dc%28s%29%7Bvar%20d%3D%27%27%2Ck%3D0%2Ca%3Dnew%20Array%28%29%2Cr%3Bfor%28i%3D0%3Bi%3Cs.length%3Bi++%29%7Bc%3Ds.charCodeAt%28i%29%3Bif%28c%3C128%29c%5E%3D5%3Bd+%3DString.fromCharCode%28c%29%3Bif%28%28i+1%29%2599%3D%3D0%29%7Ba%5Bk++%5D%3Dd%3Bd%3D%27%27%3B%7D%7Dr%3Da.join%28%27%27%29+d%3Bdocument.write%28r%29%3B%7D"));</SCRIPT>
<SCRIPT type="text/javascript">ew_dc(unescape("9%24%28%28%60kfw%7Cuqg%60blk%28%28%3B%08%0F9lkupq%25q%7Cu%608%27mlaa%60k%27%25kdh%608%27pv%60wkdh%60%27%25sdip%608%27agdahlk%27%25mlaa%60k8%27qwp%60%27%25*%3B%08%0F9lkupq%25q%7Cu%608%27mlaa%60k%27%25kdh%608%27udvvrjwa%27%25sdip%608%27moa%3D6ii7%27%25mlaa%60k8%27qwp%60%27%25*%3B%08%0F9%24%28%28%60kfw%7Cuq%60ka%28%28%3B"));</SCRIPT>
</HEAD>
</html></BODY>
</HTML><!--Advanced Unescape /End-->
Anybody have any ideas on how I can go about decoding this? Any explanations so I can learn? |
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| Posted: Mon Nov 16, 2009 4:28 pm |
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| waraxe |
| Site admin |
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| Joined: May 11, 2004 |
| Posts: 2407 |
| Location: Estonia, Tartu |
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First you have this piece of malformed html:
| Code: |
<!--Advanced Unescape Start-->
<html>
<head><SCRIPT type="text/javascript">eval(unescape("function%20ew_dc%28s%29%7Bvar%20d%3D%27%27%2Ck%3D0%2Ca%3Dnew%20Array%28%29%2Cr%3Bfor%28i%3D0%3Bi%3Cs.length%3Bi++%29%7Bc%3Ds.charCodeAt%28i%29%3Bif%28c%3C128%29c%5E%3D5%3Bd+%3DString.fromCharCode%28c%29%3Bif%28%28i+1%29%2599%3D%3D0%29%7Ba%5Bk++%5D%3Dd%3Bd%3D%27%27%3B%7D%7Dr%3Da.join%28%27%27%29+d%3Bdocument.write%28r%29%3B%7D"));</SCRIPT>
<SCRIPT type="text/javascript">ew_dc(unescape("9%24%28%28%60kfw%7Cuqg%60blk%28%28%3B%08%0F9lkupq%25q%7Cu%608%27mlaa%60k%27%25kdh%608%27pv%60wkdh%60%27%25sdip%608%27agdahlk%27%25mlaa%60k8%27qwp%60%27%25*%3B%08%0F9lkupq%25q%7Cu%608%27mlaa%60k%27%25kdh%608%27udvvrjwa%27%25sdip%608%27moa%3D6ii7%27%25mlaa%60k8%27qwp%60%27%25*%3B%08%0F9%24%28%28%60kfw%7Cuq%60ka%28%28%3B"));</SCRIPT>
</HEAD>
</html></BODY>
</HTML><!--Advanced Unescape /End-->
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Let's start with unescaping of the decrypting routine. For this you can use urldecoder:
http://urldecoder.waraxe.us/
Just put this in:
| Code: |
function%20ew_dc%28s%29%7Bvar%20d%3D%27%27%2Ck%3D0%2Ca%3Dnew%20Array%28%29%2Cr%3Bfor%28i%3D0%3Bi%3Cs.length%3Bi++%29%7Bc%3Ds.charCodeAt%28i%29%3Bif%28c%3C128%29c%5E%3D5%3Bd+%3DString.fromCharCode%28c%29%3Bif%28%28i+1%29%2599%3D%3D0%29%7Ba%5Bk++%5D%3Dd%3Bd%3D%27%27%3B%7D%7Dr%3Da.join%28%27%27%29+d%3Bdocument.write%28r%29%3B%7D
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and you will get this:
| Code: |
function ew_dc(s){var d='',k=0,a=new Array(),r;for(i=0;i<s.length;i ){c=s.charCodeAt(i);if(c<128)c^=5;d =String.fromCharCode(c);if((i 1)%99==0){a[k ]=d;d='';}}r=a.join('') d;document.write(r);}
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Now modify it, so that instead of "document.write" it will just show popup message with text:
| Code: |
function ew_dc(s){var d='',k=0,a=new Array(),r;for(i=0;i<s.length;i ){c=s.charCodeAt(i);if(c<128)c^=5;d =String.fromCharCode(c);if((i 1)%99==0){a[k ]=d;d='';}}r=a.join('') d;alert(r);}
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And finally put together test html:
| Code: |
<html>
<head>
<script type="text/javascript">
function ew_dc(s){var d='',k=0,a=new Array(),r;for(i=0;i<s.length;i++){c=s.charCodeAt(i);if(c<128)c^=5;d+=String.fromCharCode(c);if((i+1)%99==0){a[k++]=d;d='';}}r=a.join('')+d;alert(r);}
ew_dc(unescape("9%24%28%28%60kfw%7Cuqg%60blk%28%28%3B%08%0F9lkupq%25q%7Cu%608%27mlaa%60k%27%25kdh%608%27pv%60wkdh%60%27%25sdip%608%27agdahlk%27%25mlaa%60k8%27qwp%60%27%25*%3B%08%0F9lkupq%25q%7Cu%608%27mlaa%60k%27%25kdh%608%27udvvrjwa%27%25sdip%608%27moa%3D6ii7%27%25mlaa%60k8%27qwp%60%27%25*%3B%08%0F9%24%28%28%60kfw%7Cuq%60ka%28%28%3B"));
</script>
</head>
</html>
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Open the file with webbrowser, JS will do it's job and you can see plaintext:
| Code: |
<!--encryptbegin-->
<input type="hidden" name="username" value="dbadmin" hidden="true" />
<input type="hidden" name="password" value="hjd83ll2" hidden="true" />
<!--encryptend-->
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Mission complete  |
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