On December 4, 2024, hacker group Brain Cipher added Deloitte UK to its Tor-based leaked web site. The gang claimed to have stolen one terabyte of compressed data from the company.
A Deloitte spokesperson addressed these claims, stating that the source of data is a single client’s system, which is not connected to the company’s network. The company emphasized that “No Deloitte systems have been impacted”, based on their ongoing investigation.
The hackers are threatening to make the stolen files available unless a ransom is paid, and it set a deadline of December 15 for Deloitte to respond.
The Brain Cipher hacker group has been active since at least April 2024. On June 20, 2024, the group targeted an Indonesian data center, causing the disruption of around 210 critical government services, including customs and immigration. The cyber attack also caused significant airport delays. The Brain Cipher ransomware group initially demanded an $8 million ransom but later released the decryptor for free.
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