A US IT company urged customers to shut down their servers Friday after cyberattackers smuggled ransomware onto its network platform, APA reports citing AFP.
Kaseya said Friday evening that it had limited the attack to "a very small percentage of our customers" who use its signature VSA software, "currently estimated at fewer than 40 worldwide."
Cybersecurity firm Huntress Labs had earlier said in a Reddit forum that it was working with partners targeted in the attack, and that some 200 businesses "have been encrypted."
Ransomware attacks typically involve locking away data in systems using encryption, making companies pay to regain access.
Kaseya describes itself as a leading provider of IT and security management services to small and medium-sized businesses.
VSA, the company's flagship offering, is designed to let companies manage networks of computers and printers from a single point.
The company became aware of a possible incident with VSA at midday on the US east coast and "immediately shut down" its servers as a "precautionary measure," it said.
Kaseya also "immediately notified our on-premises customers via email, in-product notes, and phone to shut down their VSA servers to prevent them from being compromised."
"We believe that we have identified the source of the vulnerability and are preparing a patch to mitigate it," the company said in a statement.
According to the New Zealand government's Computer Emergency Response Team, the attackers were from a hacking group known as REvil.