A Second Look at CVE-2019-19781 (Citrix NetScaler / ADC)

Authors: Rich Warren of NCC Group FSAS & Yun Zheng Hu of Fox-IT, in close collaboration with Fox-IT’s RIFT. About the Research and Intelligence Fusion Team (RIFT): RIFT leverages our strategic analysis, data science, and threat hunting capabilities to create actionable threat intelligence, ranging from IOCs and detection capabilities to strategic reports on tomorrow’s threat … Continue reading A Second Look at CVE-2019-19781 (Citrix NetScaler / ADC)

Detecting random filenames using (un)supervised machine learning

Combining both n-grams and random forest models to detect malicious activity. Author: Haroen Bashir An essential part of Managed Detection and Response at Fox-IT is the Security Operations Center. This is our frontline for detecting and analyzing possible threats. Our Security Operations Center brings together the best in human and machine analysis and we continually … Continue reading Detecting random filenames using (un)supervised machine learning

Office 365: prone to security breaches?

Author: Willem Zeeman "Office 365 again?". At the Forensics and Incident Response department of Fox-IT, this is heard often.  Office 365 breach investigations are common at our department. You’ll find that this blog post actually doesn’t make a case for Office 365 being inherently insecure – rather, it discusses some of the predictability of Office … Continue reading Office 365: prone to security breaches?

Using Anomaly Detection to find malicious domains

Applying unsupervised machine learning to find ‘randomly generated domains. Authors: Ruud van Luijk and Anne Postma At Fox-IT we perform a variety of research and investigation projects to detect malicious activity to improve the service of  our Security Operations Center. One of these areas is applying data science techniques to real world data in real … Continue reading Using Anomaly Detection to find malicious domains

Export corrupts Windows Event Log files

Exported .evtx files may contain corrupted data - Check interpretation of forensic tools. Author: Jeffrey Wassenaar Introduction As forensic investigators, we truly love log files. During the investigation of a system with a Microsoft Windows operating system, Windows Event Log files (.evtx) can be very useful. System events (such as logons) are logged, but applications … Continue reading Export corrupts Windows Event Log files

Cryptolocker variant Torrentlocker making new victims in NL

This posting is an update to Torrentlocker blog postings of October 15 and October 21. Introduction Since past weekend, the Netherlands were hit with another spam run spreading the Cryptolocker variant known as Torrentlocker. Torrentlocker presents itself to victims as Cryptolocker in all cases, however this is a completely different malware. Fox-IT received multiple reports … Continue reading Cryptolocker variant Torrentlocker making new victims in NL

Update on the Torrentlocker ransomware

This posting is an update to the Torrentlocker blog posting of October 15. For guidance on containment and recovery, see the previous blog post. Financial aspects Payments for the ransom have to be done in Bitcoins. We have identified 7 Bitcoin addresses that received ransom payments. The total income as of the 21th of October … Continue reading Update on the Torrentlocker ransomware

New Torrentlocker variant active in the Netherlands

Introduction The Netherlands was hit with a new spam run designed to spread a cryptolocker variant known as torrentlocker from Monday October 13th 2014 onwards. Please note that torrentlocker appears to present itself to victims as cryptolocker in all cases. Fox-IT now receives multiple reports of new victims in the Netherlands and we are currently … Continue reading New Torrentlocker variant active in the Netherlands

Live blog on SSLv3 protocol vulnerability ‘POODLE’

Google has announced the discovery of a protocol vulnerability in SSLv3. This vulnerability allows an attacker to read contents of connections secured by SSLv3. SSLv3 is a Secure Sockets Layer (SSL) protocol that has been ratified in 1996. SSL is used to encrypt communications between clients and servers. It is usually integrated with webservers, mailservers or … Continue reading Live blog on SSLv3 protocol vulnerability ‘POODLE’