Botconf Author Listing

Yonathan Klijnsma

Bio: “Yonathan was a very talented security researcher. But more importantly, he was a very kind person. I hope he will be remembered for his kindness in sharing his research and in supporting other people in their work.” (Martijn Grooten, 11/01/2021)
Date: 2015-12-02
Ponmocup, the full story: A giant hiding in the shadows
Maarten van Dantzig 🗣 | Yonathan Klijnsma 🗣

Abstract (click to view)

Ponmocup is one of the most successful and longest running botnets of the past decade. First detected in 2006, as Vundo or Virtumonde, and detected as Ponmocup starting in 2011, we believe this is one of the most underestimated botnets still under continuous development.
Though Ponmocup has received a minimal amount of attention from the security community, it is in fact a sophisticated botnet serving different purposes. Though these purposes have often been described as low-risk functionalities, the malware is actually used by a group of sophisticated criminals who use the botnet for various (financials) gains, and are likely conducting a limited amount of targeted attacks.

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Date: 2015-12-04
The story of Cryptowall: a historical analysis of a large scale cryptographic ransomware threat
Yonathan Klijnsma 🗣

Abstract (click to view)

For almost two years Cryptowall has been making its rounds encrypting the files of victims and extorting them for money in the form of Bitcoins. Following in the footsteps of Cryptolocker Cryptowall has made many victims including law enforcement, large organizations as well as the general public.

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