My name is Philipp C. Heckel and I write about nerdy things.
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Monthly Archives / July 2013


  • Jul 18 / 2013
  • 13
Administration, Linux, Security

How To: DNS spoofing with a simple DNS server using Dnsmasq

The Domain Name System (DNS) is one of the fundamental services of the Internet. By resolving domain names to IP addresses, it makes routing of IP packets possible and thereby lets browsers and other clients connect to remote servers using all kinds of protocols. By blindly connecting to the IP address returned by the DNS server, however, users put a lot of trust into DNS, because by default, DNS responses are not validated or verified.

In this blog post, I’d like to demonstrate how to easily set up a DNS server that allows you to easily forge certain entries manually — thereby allowing you to either block certain domains from your network or to pretend that you are a certain website. This scenario is commonly referred to as DNS forgery or DNS spoofing.

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  • Jul 07 / 2013
  • 159
Mobile, Programming, Scripting

Send WhatsApp messages via PHP using WhatsAPI

I recently discovered that once you have acquired your WhatsApp account password, it’s relatively easy to send and receive WhatsApp messages via PHP. Using the PHP-based framework WhatsAPI, a simple WhatsApp notifier script only has a dozen lines of code.

This tiny tutorial shows how to use the two very basic functions of WhatsAPI, namely to send simple outgoing messages to any number and to listen for new incoming messages from your own WhatsApp account. This is the second part of a two-part tutorial. The first part demonstrated how to sniff the WhatsApp password from your Android phone or iPhone.

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  • Jul 05 / 2013
  • 59
Android, Mobile, Security

How To: Sniff the WhatsApp password from your Android phone or iPhone

WhatsApp is a very popular SMS-like messenger for smartphones, but it’s unfortunately only available for smartphones right now. If you want to use other tools or write web applications that send or receive WhatsApp messages (e.g. WhatsAPI), you have to find a way to sniff the WhatsApp password from your smartphone. Until recently, this password was just an MD5 hash of your IMEI (or MAC address), but that has changed when that was uncovered. Since then, the WhatsApp server assigns a password to each device/account when it first registers.

This tutorial demonstrates how to capture the WhatsApp password of your WhatsApp account using the SSL/TLS proxy mitmproxy. Once you have this password, you can use it to communicate with the WhatsApp servers directly or via a framework. This is the first part of a two-part tutorial. The second part demonstrates how to send and receive WhatsApp messages via PHP.

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  • Jul 01 / 2013
  • 61
Android, Linux, Security

How To: Use mitmproxy to read and modify HTTPS traffic

Capturing HTTP and HTTPS traffic on your own machine is quite simple: Using tools like Wireshark or Firebug, sniffing the local connections is only a matter of seconds. Capturing and/or altering the HTTP/HTTPS traffic of other machines in your network (such as your smartphone or other laptops) on the other hand is not so easy. Especially sniffing into SSL-secured HTTPS-connections seems impossible at first. Using mitmproxy, however, makes this possible in a very easy and straight forward way.

This small tutorial shows how to use mitmproxy to transparently sniff into and alter (!) HTTPS connections of your phone or other devices in your network.

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