TASKomertsbank

The organisation is known by the alias TASKomertsbank.
Its headquarters is located in Ukraine.

On 27 June 2017 a cyberattack involving the NotPetya malware was launched against Ukrainian systems.
The NotPetya malware presented itself as ransomware but was actually designed to cause irreversible damage to infected computers.
The primary target of the attack was Ukrainian critical infrastructure.
The initial infection vector was a compromised update mechanism for a widely used tax accounting software package.

The attack disrupted banking operations throughout Ukraine.
Radiation monitoring systems at the Chernobyl nuclear site were affected.
Transportation networks experienced service interruptions.
Various government functions were impaired as a result of the infection.
The malware subsequently spread beyond Ukraine, impacting multinational corporations worldwide.
The incident caused financial losses estimated in the billions of dollars.

Ukrainian authorities and international cybersecurity firms attributed the attack to Russian military‑linked actors.
This attribution was based on observed patterns of prior cyber aggression attributed to those groups.
The Russian government denied any involvement in the operation.
The event is commonly referenced as the 2017 Ukraine ransomware attacks.
A detailed description of the incident can be found in the Wikipedia article on the 2017 Ukraine ransomware attacks.