Chainalysis restores services after cyberattack

Chainalysis has restored its main services after a cyberattack exposed customer information and forced several products offline.

According to the company’s latest update, Data Solutions returned online on November 10, while Reactor, KYT and Address Screening had already been restored on November 7 with additional security measures.

Chainalysis said the attacker gained unauthorized access to company systems and internal tools using what it described as “offensive agentic techniques.”

The company later confirmed that names, usernames, password hashes and live tokens for users had been exposed. It also identified abnormal activity affecting some customer accounts.

“This month, Chainalysis detected an external actor using offensive agentic techniques to gain unauthorized access to Chainalysis systems and internal tools.”

As services were restored, customers were required to reset passwords and update access credentials. Chainalysis said it has found no evidence that investigation content was accessed or that its attribution data was manipulated.

Chainalysis provides blockchain intelligence and compliance tools used by financial institutions, regulators and law enforcement agencies.