Ukrainian Mobile Operator Suffers A Large-Scale Cyber Attack 

Ukraine's largest mobile network Kyivstar has suffered a massive cyber attack, knocking the service offline for an extended period from the 12th December. 

The Security Service of Ukraine (SBU) said it had opened criminal proceedings to investigate the the attack on Kyivstar, and that “one of the versions currently being investigated by SBU investigators is that the Russian special services may be behind this hacker attack.”

The Kyivstar network is estimated to have some 24 million mobile customers and a million home internet users and this attack also disrupted the air raid alert systems themselves in parts of Kyiv.

The attack on Kyivstar, which has more than 50% of Ukraine's population as mobile subscribers, was taken out services, damaged IT infrastructure and millions could not receiving mobile warnings of potential Russian air assaults. 

While the company's own website was offline, Kyivstar has posted statement on social media saying that the attack caused a “technical failure” that left customers without mobile connections or internet access. The company's Chief Executive Officer Oleksandr Komarov said the attack was a result of the war with Russia. "War is also happening in cyberspace. Unfortunately, we have been hit as a result of this war... The attack significantly damaged our infrastructure, limited access, we could not counter it at the virtual level, so we shut down Kyivstar physically to limit the enemy's access."  he told national television.

Komarov did not name who he believed to be responsible, but Russian hacktivist group Killnet claimed responsibility for the attack via a statement on the Telegram. Kyivstar's Dutch parent company Veon said it would work with Kyivstar on "additional security measures" to prevent similar incidents in future.

At the same time that Kyivstar came under attack, Monobank, one of Ukraine’s largest financial institutions, said it had also been targeted by hackers. The bank’s co-founder Oleh Gorokhovsky said on Telegram that the organisation had been struck by a “massive DDoS” attack, aimed at knocking services offline.

Ukraine Defence MinistryTSN.UA     OGo/ Telegram:   VEON:   BBC:     Reuters:      XinhuaNet:    Computing

Techcrunch:   Cyberscoop:      The Record:   

You Might Also Read: 

Ukraine’s Cyber Conflict With Russia:

___________________________________________________________________________________________

If you like this website and use the comprehensive 6,500-plus service supplier Directory, you can get unrestricted access, including the exclusive in-depth Directors Report series, by signing up for a Premium Subscription.

  • Individual £5 per month or £50 per year. Sign Up
  • Multi-User, Corporate & Library Accounts Available on Request

Cyber Security Intelligence: Captured Organised & Accessible


 



 

« Online Fraud Is Driven By Human Trafficking
Hackers Want Your Pension »

Infosecurity Europe
CyberSecurity Jobsite
Perimeter 81

Directory of Suppliers

XYPRO Technology

XYPRO Technology

XYPRO is the market leader in HPE Non-Stop Security, Risk Management and Compliance.

ZenGRC

ZenGRC

ZenGRC (formerly Reciprocity) is a leader in the GRC SaaS landscape, offering robust and intuitive products designed to make compliance straightforward and efficient.

Practice Labs

Practice Labs

Practice Labs is an IT competency hub, where live-lab environments give access to real equipment for hands-on practice of essential cybersecurity skills.

Syxsense

Syxsense

Syxsense brings together endpoint management and security for greater efficiency and collaboration between IT management and security teams.

Infosecurity Europe, 3-5 June 2025, ExCel London

Infosecurity Europe, 3-5 June 2025, ExCel London

This year, Infosecurity Europe marks 30 years of bringing the global cybersecurity community together to further our joint mission of Building a Safer Cyber World.

Kaseya

Kaseya

Kaseya is a premier provider of unified IT management and security software for managed service providers (MSPs) and small to medium-sized businesses (SMBS).

Clusit

Clusit

Clusit is the Italian Association for Information Security, a nonprofit organization devoted to promoting every aspect of information security.

Center for Strategic Cyberspace & International Studies (CSCIS)

Center for Strategic Cyberspace & International Studies (CSCIS)

CSCIS seeks to advance global cyberspace security and prosperity by providing strategic insights for cyberspace and policy solutions to decision makers.

ID Agent

ID Agent

ID Agent provides a comprehensive set of threat intelligence and identity monitoring solutions.

Sage Designs

Sage Designs

Sage Designs is a provider of SCADA, Security & Industrial Automation products and training programs.

Information Systems Security Partners (ISSP)

Information Systems Security Partners (ISSP)

ISSP is a specialized system integrator focused on the information security needs of its corporate clients and providing best in class products and services for securing organizational information.

HKCERT

HKCERT

HKCERT is the centre for coordination of computer security incident response for local enterprises and Internet Users in Hong Kong.

Oznet Cyber Security

Oznet Cyber Security

Oznet Cyber Security is dedicated to offering integral solutions oriented to the support and security of information.

UK Research & Innovation (UKRI)

UK Research & Innovation (UKRI)

UKRI works in partnership with universities, research organisations, businesses, charities, and government to create the best possible environment for research and innovation to flourish.

SOC.OS Cyber Security

SOC.OS Cyber Security

SOC.OS is an alert correlation and triage automation tool. It correlates and prioritises your alerts, boosting productivity, enhancing threat visibility and shortening mean time to respond.

Boxphish

Boxphish

Boxphish provides a proven solution to reduce Human Error and Cyber Human Risk via automated learning journeys and intelligent phishing simulations.

IPKeys Technologies

IPKeys Technologies

IPKeys delivers innovative cybersecurity and technology solutions focused on helping the federal government reduce risk and protect the US from cyberattacks.

TwoThreeFour

TwoThreeFour

ThreeTwoFour provide tailored cyber security solutions, delivered by highly-skilled, experienced consultants who respond to the real needs of you and your business.

DataSixth Security Consulting

DataSixth Security Consulting

DataSixth delivers Cybersecurity Intelligence. With our unique capabilities, we’re able to deliver value, deliver answers, and deliver actionable security intelligence.

Legit Security

Legit Security

Legit Security's mission is to secure every organization's software factory by protecting the pipelines, infrastructure, code and people for faster and more secure software releases.

SUCCESS Computer Consulting

SUCCESS Computer Consulting

SUCCESS Computer Consulting is a leader in managed IT and security services for small and medium-sized businesses in Minneapolis, St. Paul, and the surrounding Twin Cities Metro area.