The Church of WiFi gave a presentation on some of their recent projects. The first was coWPAtty, a program for brute forcing WPA-PSK. To speed up the process they created a table for pre-hashed WPA-PSK. WPA-PSK is seeded using the SSID of the router, so they grabbed the top 1000 SSIDs from Wigle.net and calculated the hashes when using a 170,000 word dictionary. Now they are able to check 18,000 keys/sec instead of just 12 keys/sec.

The next project was Evil Bastard, a custom WRT firmware. It is similar to Rogue Squadron which is a firmware designed to spoof an access point and collect user information by phishing. Evil Bastard has even more tools like Aircrack and Driftnet. It even features a “Point ‘n 0wn” interface that lets you just click on the target you want to automatically spoof.

The CoWF is also responsible for Kiswin, Kismet for Windows, which saves you from having to install Cygwin.

Continue reading “Shmoocon 2006: The Church Of Wi-Fi Presents: An Evil Bastard, A Rainbow And A Great Dane!” →

Billy Hoffman has built a site crawler that can hide its activity within normal web traffic. Crawling a website is one of the easiest ways to find exploitable pages, but the systematic nature of the crawl makes it stand out in logs. Billy set out to design a crawler that would behave like a normal web browser. It follows more popular links first (think “news”, not “legal notice”) and it doesn’t hit deep linked pages directly without first creating an appropriate Google referrer. There are tons of other tricks involved in making the crawler look “human” which you’ll find in Billy’s slides over at SPI Labs. You can also read about the talk on Wired News.

Continue reading “Shmoocon 2006: Covert Crawling: A Wolf Among Lambs” →

A common approach to analyzing malware is to turn it loose inside of a VMware session, but some malware have methods for detecting virtual machines and will refuse to run if they encounters one. Joe Stewart has developed a tool called Truman that can be used to construct a sandnet. The sandnet expands on the idea of using VMware as a sandbox. The malware runs inside of a normal OS environment not a virtual one and it interacts with what it thinks is an entire network.

This is how the setup works: You have two machines connected using a crossover network cable. Machine 1 is the server and machine 2 is the client that the malware will be run on. Machine 2 is booted via PXE into a clean Windows install (or whatever OS your malware is for). Once booted it begins watching a directory on the server for the malware’s exe. Once you copy the executable into the directory the Windows machine copies the file and executes it. After 10 minutes the Windows machine dumps its physical memory to disk and then shuts down. An image of the newly infected Windows file system is then saved. The client machine then boots into Linux for analysis of the new Windows image. Truman improves analysis speed because you don’t have to constantly reimage the client machine by hand.

The PXE server also acts as a fauxinternet for the client machine. By watching tcpdump you can see what outbound connections the malware is trying to make. To aid in this process, Truman includes several fauxservers which are just simple Perl scripts designed to act like servers. The fauxservers tell the malware exactly what it wants to hear in hopes that it will cough up logins, passwords and other useful information.

Continue reading “Shmoocon 2006: Behavioral Malware Analysis Using Sandnets” →