Black Basta Group Claims Ransomware Attack at UK Water Treatment Company

April 2, 2024


Southern Water, a water treatment company serving millions across the United Kingdom, was the victim of a ransomware attack claimed by the Black Basta ransomware gang.

"At this point there is no evidence that our customer relationships or financial systems have been affected. Our services are not impacted and are operating normally," Southern Water said today. It's unclear where the root cause of the breach lies. Some documents leaked online are branded with Greensands logos – the parent company of Southern Water.

Black Basta said it stole 750 GB worth of data in total, comprised of personal data and corporate documents, which is consistent with the small sample leaked online.

Incident Date

January 23, 2024

Estimated Cost

No cost values disclosed.

Type of Malware

No Malware identified

Threat Source