Private health insurer Medibank yesterday said that more data was stolen in a recent hack than it initially realised. Up to 4 million current Medibank customers may be affected, and they say sensitive information linked to past customers is also part of the data that has been breached. Medibank says private medical records have been stolen, but it still doesn’t know the exact number affected. Calling it a “distressing development”, CEO David Koczkar apologised again to members. “This is a malicious attack that has been committed by criminals with a view of causing maximum fear and damage,” he said. If you’re a member and are worried about it, they say their cybercrime hotline is worth a ring.