Bad Rabbit, a ransomware infection thought to be a new variant of Petya, has apparently hit a number of organisations in Russia and Ukraine.
In a tweet, Russian cybersecurity firm Group-IB said that at least three media organisations in the country have been hit by file-encrypting malware.
At the same time, Russian news agency Interfax said its systems have been affected by a "hacker attack".
"Interfax Group's servers have come under a hacker attack. The technical department is taking all measures to resume news services. We apologize for inconvenience," Interfax said in a statement.
Read more: Bad Rabbit ransomware: A new variant of Petya is spreading, warn researchers | ZDNet