Intelligence-Driven Managed Detection and Response for European Enterprises

Founded in Copenhagen in 2003, CSIS Security Group is a European cybersecurity services firm built around intelligence-driven detection and response. Its customers are enterprises and public-sector bodies in banking, media, critical infrastructure, and government, along with law enforcement agencies across Europe. The company employs roughly 130 people of more than twenty nationalities, working from offices in Copenhagen, Skanderborg, Stockholm, London, and Amsterdam. It has been owned by Allurity AB, a Trill Impact portfolio group, since 2022.

The managed detection and response practice centres on Microsoft Sentinel as the analysis layer, fed by endpoint telemetry from Microsoft Defender XDR and network and OT visibility from Darktrace. More than 150 custom Sentinel detection rules, written by in-house research and incident response teams, sit on top of that stack. A proprietary Cyber Defence Feed harvests and curates threat indicators continuously, pushing them into firewalls, SIEMs, and third-party platforms such as Anomali ThreatStream to block known-bad activity before detection is needed.

Tiered service levels separate the offering: automated remediation handles low and medium severity alerts, while analysts take over high and critical cases, and the Elite tier carries an incident response guarantee under which CSIS covers response costs for incidents its detection misses. Surrounding the SOC are threat hunting, digital risk protection and anti-phishing, compromise assessment, Active Directory and cloud security consulting, emergency response retainers, and NIS2 readiness work. The 2024 addition of SecAlliance deepened the intelligence side.