Tesorion Selects Passguard as Partner: First MSSP to Integrate Infostealer Monitoring

Through its partnership with Passguard, Tesorion gains visibility into infected devices and the associated stolen sessions and credentials. This data is traded on closed criminal marketplaces. By leveraging these insights, Tesorion can identify risks at an early stage and proactively warn customers.

The Growing Risk of Infostealers

With the rise of infostealers, the risk of account compromise has increased significantly. Traditional security controls often fail to detect this threat, as infostealers frequently operate on unmanaged devices. Addressing this risk requires a different approach. Infostealer monitoring is therefore a logical extension of Managed Detection and Response (MDR) services, helping organizations mitigate a threat that affects virtually every business.

Tom Leijte, CEO and co-founder of Passguard, explains how infostealer intelligence is translated into concrete security services through this collaboration:

“Passguard provides visibility into infostealer infections and stolen sessions. Tesorion translates that intelligence into actionable services—within MDR, during incident response engagements, or as input for red team exercises. This ensures Tesorion customers are better protected against the rapidly growing threat of infostealers.”

Daniel Jansen explains Tesorion’s decision to select Passguard:

“We conducted a thorough comparison of multiple providers, evaluating both the quality of the data and its applicability within our services. Based on that assessment, we chose Passguard. Their specialist focus on infostealers, high-quality intelligence, and careful, Dutch-based approach were decisive factors for us.”

About Tesorion

Tesorion delivers high-quality, 24/7 Managed Detection & Response (MDR) services from the Tesorion Security Operations Center (T-SOC) in Nieuwegein. As a Dutch multidisciplinary cybersecurity provider, Tesorion helps organizations increase their cyber maturity and minimize the risk of cyber incidents through a comprehensive portfolio of services, including Threat Monitoring & Response (T-SOC), Incident Response (T-CERT), Offensive Security (Red Team), Advisory, and proprietary Threat Intelligence.

Within the Microsoft Active Protections Program (MAPP), Tesorion is the only partner in continental Europe to have achieved the status of Threat Indicator Top Contributor. Tesorion is also an associate partner of the NoMoreRansom project and a member of Melissa, the public-private partnership combating ransomware.

More information: www.tesorion.nl

About Passguard

Passguard, headquartered in Leusden, is a dark web monitoring platform specialized in detecting infostealer infections. The platform monitors criminal marketplaces and underground networks to identify stolen credentials and malware infections at an early stage, enabling organizations to take immediate action. Customers include Damen Shipyards, Royal FloraHolland, and AFAS Software.