Meet Brain Cipher — The new ransomware behind Indonesia's data center attack

**Executive summary:** Brain Cipher is a newly observed ransomware operation using a LockBit 3.0–derived encryptor that attacked Indonesia's temporary National Data Center on June 20, encrypting files (including filename encryption), disrupting services for over 200 government agencies, demanding up to $8 million in Monero, and launching a data-leak site to enable double-extortion; samples and negotiation chats indicate active exploitation and lateral-network compromise via stolen domain admin credentials.