British COLT Telecom hit by WarLock Ransomware

UK-based telecommunications company Colt Technology Services suffered a cyberattack, The attack caused a multi-day outage of some of the company's operations, including hosting and porting services, Colt Online, and Voice API platforms. The company stated the impacted systems are support services, not the core customer network infrastructure. Warlock is said to be behind the attack. The group has not leaked even a snippet of the data it stole online. Instead it opted to try and sell the data privately via auction

The recovery might not be completed until late November 2025. If Colt's estimated return-to-normal timeframe is accurate, the time spent tackling the disruption would amount to more than three and a half months.

Estimated Cost

est. 3,5 mts operational disruption

Threat Source

Impacts

IT