![]() ![]() ![]() XOR encoding is frequently used in JavaScript exploits as an attempt to avoid detection by IDS sensors and Antivirus software. For older versions of Windows, the following encoded script is returned (heavily modified - Antivirus tools seem to love this exploit):Įs:="xxx 124 118 121 110 113 120 112 107 14 86 "ĭ:=es^x x+=1 ds:=ds+omCharXode(d) It starts with checking the browser version of the user, and then supplies the correct exploit to match. The second exploit, hidden behind the /e2/ frame, is nastier. The ZIP turns out to be an EXE obfuscated with the FSG packer, and when run downloads and executes a file called "update.exe" from the attacker's site. But things are not always what they seem. In addition to the actual exploit code, the JAR archive also contains a ZIP file. The corresponding vulnerability is pretty old (MS03-011), making "success" of this exploit highly doubtful.ĪPXLET ARCHIVE="/e1/java.jar" CODE="NudeBoxx.class" The first exploit, hidden behind the "e1" frame, is a Java based privilege escalation, a variant of the Java Bytever/Classloader family of exploits. We woudln't want a SANS ISC diary to trigger your workstation or perimeter antivirus.Įxploit #1 - Java Classloader Vulnerability Some of the original HTML off the hostile site had to be heavily modified for this write-up, mainly by cutting out sections or converting characters to "X". Here's a write-up of what we found, to sharpen your malware survivor senses. After digging around some, he found his hunches confirmed, and also two files that none of the AV vendors on seemed to recognize as hostile. With the suspicious nature common to malware survivors, ISC reader Phil "got a bit worried" when he noticed that a web site was opening a zero-width frame that seemed to hide something. Porque hablo mejor PERL que Espanol, dejo de escribir el diario de hoy en ese idioma, pero os deseo una fiesta estupenda! Es la unica del siglo con la fecha 5-5-5 :-). Los amigos Mexicanos celebran hoy el 5 de mayo, una fiesta en conmemoracion de la derrota de Maximiliano en 1867. ![]()
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