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In this write up we will examine an operational Sweet Orange Exploit Kit. The focus will be on the exploits delivered and the behaviour of the exploit kit. The Sweet Orange kit that we will be examining was using an iframe injected into a compromised website to load the exploit landing page.

The iframe loads the exploit kit landing page which contains some fairly simple obfuscated javascript and a Java applet. If the server deems you un-exploitable you get a nice error this may also be used to avoid detection. Once we de-obfuscate the javascript we sweet orange java obfuscated binary trading see that it's written a Java JNLP applet tag to the document. There is also another applet on the page that does not use JNLP. With the Java security warning safely circumvented the exploit kit is free to run the applet.

Let's start by decompiling the main class piXDw. Once we decompile the class files we can see that they are obfuscated. At first these look pretty difficult to decipher but upon closer inspection we can see there is just some junk code added all of the Math. To illustrate I've included a snip of some obfuscated code before de-obfuscation. After we de-obfuscate we can see the init for the applet simply checks to see if the victim is running Java 1.

Taking a look at GVep. We will get to just what is inside the mp4 file in a minute but for now we have spotted the exploit that is being used: Well this is interesting, let's take a look at the wgSqXvtqE. At first we see we will need to de-obfuscate the ascii by removing And now we are left with what appears to be an ascii representation of the hex bytes of a class file. We can use some python to quickly convert this into binary and decompile into it's original java.

Judging by the similarity of the exploit structure to other examples of "Sweet Orange" we can assume that this is some variation of the Sweet Orange exploit kit. An excellent writeup on the the sweet orange java obfuscated binary trading can be found here. Now that we have confirm that this is indeed CVE what happens after the security manager is disabled? We can see that there is one line of code after the security manger has been disabled, let's sweet orange java obfuscated binary trading there.

If we follow this example all the way through we can see that the malware constructs a url request like so in order to download the binary payload the count. After some manual testing it was confirmed that the count. The binare optionen norbert kaufmann kit uses dynamic DNS provided by http: The kit uses a subdomain generation algorithm to generate a new subdomain every few minutes. Old subdomains are unregistered making research a bit more difficult.

After tracking the subdomain generation for 24h it is confirmed that all subdomains that have been used resolve to this IP: The url pattern for landing page: The url pattern for the payload binary is: The payload is also re-generated sweet orange java obfuscated binary trading few minutes.

This article was transferred from the herrcore blog. The Drive-By The Sweet Orange kit that we will be examining was using an iframe injected into a compromised website to load the exploit landing page.

The Exploit Kit Landing Page The iframe loads the exploit kit landing page which contains some fairly simple obfuscated javascript and a Java applet. Inside the Exploit With the Java security warning safely circumvented the exploit kit is free to run the applet. If we work backwards we can see that "String as[]" contains the applet params. Let's decrypt these sweet orange java obfuscated binary trading Param Decrypted Value qUsN fnlczho. Review Before we move on to behavioural analysis we will recap what we have learned so far: A list of identified domains can be found below.

File MD5 Virus Total 50ee5cc1cdcbdb0 virustotal 43aa3cf64c9f5aeaac1 virustotal d0a05fdb78d7ea1fe1f virustotal Update Updated indicators:

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Herman, Jonas Burghoff, Matthias Will, Stefan Nolte, and Andreas Tunnermann Opt. Lett. 30 (9) 964-966 (2005). Citing articles from OSA journals and other participating publishers are listed here.