Colt Telecom has been victim of a ransomware attack
Timing: Attack started Aug 12, 2025
Impact:
- Multi-day outage of operations, including hosting, porting, Colt Online and Voice API platforms
- Financial, employee, customer, executive data, internal emails and software development info have been leaked
Attacker: WarLock ransomware group has claimed responsibility
Remediation:
- Authorities have been notified
- Third-party cybersecurity experts have been engaged to investigate and restore systems
Colt Telecom attack claimed by WarLock ransomware, data up for sale
UK-based telecommunications company Colt Technology Services is dealing with a cyberattack that has caused a multi-day outage of some of the company's operations, including hosting and porting services, Colt Online and Voice API platforms.