To learn the tools, tactics and motives involved in computer and network attacks, and share the lessons learned.

Blogs

Is that PDF so scary?

- "it bypasses DEP and ASLR using impressive tricks and unusual methods" - Vupen

- "it uses a previously unpublished technique to bypass ASLR" - Metasploit Blog

- "exploit uses the ROP technique to bypass the ASLR and DEP" - ZDnet/Kasperky

Forensic Challenge 2010/5 - Log Mysteries is now live

After a short break, I am pleased to announce the next forensic challenge: Forensic Challenge 5 - Log Mysteries. This challenge takes you into the world of virtual systems and confusing log data. Figure out what happened to a virtual server using all the logs from a possibly compromised server.

Challenge 5 has been created by Raffael Marty from the Bay Area Chapter, Anton Chuvakin from the Hawaiian Chapter, and Sebastien Tricaud from the French Chapter. It is a bit more open ended than the last challenges, so I am really looking forward to some creative answers!

Submission deadline is September 30th and we will be announcing winners around October 21st. We have a few small prizes for the top three submission.

Enjoy!

Export Address Table Filtering (EMET v2)

I'll tell you the truth: Export Address Table Filtering, the feature of the upcoming release of EMET, "designed to break nearly all shell code in use today", intrigued me a bit.

PHoneyC DOM Emulation – Browser Personality

A new improvement in PHoneyC DOM emulation code was committed in SVN r1624. The idea is to better emulate the DOM behaviour depending on the selected browser personality. Let's take a look at the code starting from the personalities definition in config.py.

39 UserAgents = [
40     (1,
41      "Internet Explorer 6.0 (Windows 2000)",
42      "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727)",
43      "Mozilla",
44      "Microsoft Internet Explorer",

TraceExploit

The Discoverer module (see zhongjie's blog entry) has been completed.
It consists of 2 programs, the Format Discovery and Pre-Replay processing.
Format Discovery is pretty much what i've blogged about in my earlier post.
Since that entry, I've completed the to-do tasks:

1) have a function to summarise all output for this program.

2) solve a memory leak problem in this program.

3) match replay packet to format, and if length segment changes (eg: due to shellcode change), then length field needs to change.

4) from replay ip, find IP tokens and change it.

TraceExploit: Replaying method dissection

I've been working on the GSOC Project 14 in recent months. We are meant to start a new tool which can replay the collected exploit traces.

We know that during the process of exploit replay, there're many fields need to be changed in the original application messages. Some of them are platform independent, and the others are platform specific. Platform-independent variables are those changed each time we exploit, like timestamp, cookie, length, etc. And platform-specific variables are those changed only if the target system is changed, like target address, return address point to the shellcode.

Another great step forward

“Dionaea is meant to be a Nepenthes successor, embedding Python as scripting language, using libemu to detect shellcodes, supporting IPv6 and TLS” (taken from Dionaea homepage). Besides being the most interesting project for trapping malware exploiting vulnerabilities, Dionaea supports a really cool feature which allows it to log to XMPP services as described here. TIP now exploits this feature receiving and storing such logs (really thanks to Markus Koetter for his help and support).

PHoneyC DOM Emulation - Window

A few weeks ago I started reviewing the PHoneyC DOM emulation code and realized it was turning to be hard to maintain and debug due to a huge amount of undocumented (and sometimes awful) hacks. For this reason I decided it was time to patch (and sometimes rewrite from scratch) such code. These posts will describe how the new DOM emulation code will work. The patch is not available right now since I'm testing the code but plans exists to commit it in the PHoneyC SVN in the next days.

TraceExploit

The first part to the format discovery is 90% completed.
The program is now able to tokenize the sample packets and sort them to clusters according to token pattern.
The structure for a token looks like this:

// definition of a node for initial tokenization
struct sToken {
struct inferProperty* sProperty;
struct inferSemantic* sSemantic;
struct formatDistinguisher* sFD;
struct sToken* next;
};

struct inferProperty {
char szType[4]; //"s-c/c-s" / "bin" / "txt"
unsigned char* pValue; //value of token. Will include

null and unicode, if there is

The winners of the 4th Forensic Challenge 2010 VoIP are ...

The 4th Forensic Challenge on VoIP has come to an end. We had a total of 21 submissions with several submissions from Chinese speakers which has been made possible by Julia, Jianwei and Roland from the Chinese speaking chapters.

The winners of the 4th Forensic Challenge 2010 VoIP are:

  1. Franck Guenichot (France)
  2. Fabio Panigatti (Italy)
  3. Shaun Zinck (USA)

We have posted their submissions onto the challenge web site so you can see what top notch submissions they provided. Franck, Fabio and Shaun will be awarded with small book prizes. Congratulations!

Thanks to all who participated in the challenge in particular Ben Reardon from the Australian and Sjur Eivind Usken from Norwegian Chapter who made this challenge possible.

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