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

Getting in the Zone: dumping Active Directory DNS using adidnsdump

Zone transfers are a classical way of performing reconnaissance in networks (or even from the internet). They require an insecurely configured DNS server that allows anonymous users to transfer all records and gather information about host in the network. What not many people know however is that if Active Directory integrated DNS is used, any … Continue reading Getting in the Zone: dumping Active Directory DNS using adidnsdump

Your trust, our signature

Written and researched by Mark Bregman and Rindert Kramer Sending signed phishing emails Every organisation, whatever its size, will encounter phishing emails sooner or later. While the number of phishing attacks is increasing every day, the way in which phishing is used within a cyber-attack has not changed: an attacker comes up with a scenario … Continue reading Your trust, our signature

Phishing – Ask and ye shall receive

During penetration tests, our primary goal is to identify the difference in paths that can be used to obtain the goal(s) as agreed upon with our customers. This often succeeds due to insufficient hardening, lack of awareness or poor password hygiene. Sometimes we do get access to a resource, but do not have access to … Continue reading Phishing – Ask and ye shall receive