“This was something new. This was ransomware done right,” said John Bambenek, president of Bambenek Consulting, who was involved in the working group that tracked CryptoLocker and talked about the operation at the Black Hat USA conference here Thursday. “It made for a good case study on how to do threat intelligence.”
The working group that came together to defeat CryptoLocker was global and had people with all kinds of different skill sets: malware reverse engineering, math, botnet tracking and intelligence. Some members worked on taking part the domain-generation algorithm while others looked at the command-and-control infrastructure and still others broke down the malware itself. What the researchers began to notice as they dug deeper into the CryptoLocker operation was that the crew behind the ransomware had done a lot of things right, but had also exhibited some oddly inconsistent behaviors.