Turla Hackers Exploit SharePoint Vulnerability in France

The notorious cyber espionage group known as Turla has once again made headlines after exploiting a vulnerability in Microsoft SharePoint to infiltrate French networks. This group, linked to Russia’s Federal Security Service, has been active for over twenty years, targeting sensitive sectors such as government and defense across various nations.

Turla’s Diverse Infiltration Techniques

Turla is recognized for its diverse array of methods to gain unauthorized access to networks. These include using phishing emails, compromised websites, and vulnerable systems. Their strategy often starts with seemingly innocuous files or poorly secured servers, eventually allowing deeper penetration into organizational networks.

According to a report by France’s Cyber Crisis Coordination Center (C4) and CERT-FR, Turla’s operations have impacted not only prominent governmental entities but also ordinary businesses and individuals. This highlights the group’s capacity to exploit a wide range of targets as part of their espionage infrastructure.

SharePoint Flaw Exploited for Access

In 2019, Turla hackers took advantage of a vulnerability in Microsoft SharePoint to compromise a server within a French justice-sector organization. This server, which hosted a continuing-education platform, provided access to a vast number of user accounts, illustrating how a single security flaw can lead to extensive privacy breaches.

Turla’s campaigns have impacted various sectors, including ministries, diplomatic bodies, and technology firms. Their techniques often involve using compromised systems as intermediary relays, making detection more challenging by blending malicious activities with legitimate network traffic.

Persistent Threat and Evolving Tactics

Turla is known for deploying custom malware families such as Uroburos and Kazuar, alongside publicly available tools like Mimikatz and Metasploit to mask their intrusions as normal activity. Their operations remain active against Ukraine, NATO countries, and EU member states, contributing to intelligence gathering during geopolitical conflicts.

The group has demonstrated a sophisticated ability to chain multiple vulnerabilities, including software flaws and social engineering attacks, to compromise targets. Their infrastructure relies on compromised servers and networks, ensuring their operations remain concealed from detection.

The insights from French investigators stress the critical need for rapid security patch implementation, particularly for internet-facing services like SharePoint. Organizations are advised to monitor for unusual server behavior, restrict administrative access, and evaluate if compromised systems are used as part of larger attacks.

Overall, the findings emphasize the importance of treating breaches as potentially far-reaching incidents, impacting communications and sensitive data well beyond the initially affected systems. Strengthening proactive defense measures is crucial to preventing significant security incidents and financial damage.