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

#cybersecurity #databreach #ColtTelecom

https://www.bleepingcomputer.com/news/security/colt-telecom-attack-claimed-by-warlock-ransomware-data-up-for-sale/

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.

BleepingComputer
Amid Service Disruption, Colt Telecom Confirms 'Criminal Group' Accessed Their Data, As Ransomware Gang Threatens to Sell It - Slashdot

British telecommunications service provider Colt Telecom "has offices in over 30 countries across North America, Europe, and Asia, reports CPO magazine. "It manages nearly 1,000 data centers and roughly 75,000 km of fiber infrastructure." But now "a cyber attack has caused widespread multi-day ser...

Colt Telecom was hit hard—a zero-day flaw in SharePoint opened the door to a crafty new ransomware group. How could one vulnerability put our digital world at risk?

https://thedefendopsdiaries.com/understanding-the-warlock-ransomware-attack-on-colt-telecom/

#warlockransomware
#colttelecom
#cybersecurity
#zerodayvulnerability
#microsoftsharepoint

Understanding the WarLock Ransomware Attack on Colt Telecom

Explore the WarLock ransomware attack on Colt Telecom, revealing vulnerabilities and the need for robust cybersecurity measures.

The DefendOps Diaries