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)

WastedLocker: A New Ransomware Variant Developed By The Evil Corp Group

Authors: Nikolaos Pantazopoulos, Stefano Antenucci (@Antelox) Michael Sandee and in close collaboration with NCC’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 landscape. Cyber security is an … Continue reading WastedLocker: A New Ransomware Variant Developed By The Evil Corp Group

In-depth analysis of the new Team9 malware family

Author: Nikolaos Pantazopoulos Co-author: Stefano Antenucci (@Antelox) And in close collaboration with NCC's RIFT. 1. Introduction Publicly discovered in late April 2020, the Team9 malware family (also known as ‘Bazar [1]’) appears to be a new malware being developed by the group behind Trickbot. Even though the development of the malware appears to be recent, … Continue reading In-depth analysis of the new Team9 malware family

LDAPFragger: Command and Control over LDAP attributes

Written by Rindert Kramer Introduction A while back during a penetration test of an internal network, we encountered physically segmented networks. These networks contained workstations joined to the same Active Directory domain, however only one network segment could connect to the internet. To control workstations in both segments remotely with Cobalt Strike, we built a … Continue reading LDAPFragger: Command and Control over LDAP attributes

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

Syncing yourself to Global Administrator in Azure Active Directory

This blog describes a vulnerability discovered by Fox-IT last year in Azure AD Connect, which would allow anyone with account creation privileges in the on-premise Active Directory directory to modify the password of any cloud-only account in Azure AD. Because of the way accounts are commonly configured, this could often enable an attacker to take … Continue reading Syncing yourself to Global Administrator in Azure Active Directory

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