Ransomware attack on Southern Water cost £4.5 million

Southern Water disclosed that a Black Basta ransomware intrusion about a year ago resulted in the theft of data from a limited portion of its servers, affecting roughly 10% of its 2.5 million customers; the company has incurred £4.5 million in response costs and media reports cite leaked gang messages mentioning a $750,000 ransom, while Southern Water states it worked with NCSC and advisers and that operations were not impacted.