Leak site responding

Brain Cipher ransomware group

Brain Cipher is one of the extortion operations we watch continuously. This page covers what is known about the group and the current state of its leak site, which we last saw change 17h ago.

Leak site statusOnlineresponding to checks

Tracked sinceAug 31earliest record we hold

Last activity17h ago4 Sep 2026 19:27 UTC

Sectors observed—none stated

Who they are

Brain Cipher ransomware surfaced in mid-2024, rapidly gaining notoriety after a high-impact attack on Indonesia’s National Data Center, which disrupted over 160 government services including immigration systems. The group operates with a double-extortion model, encrypting data using a LockBit 3.0-based payload (Salsa20/RSA hybrid) and threatening leaks via a Tor-hosted portal. Distinct behaviors include encrypting both file contents and filenames, and customizing encrypted file names with appended random extensions. Initial access methods include phishing and purchases from initial-access brokers. Ransom demands have ranged from tens of thousands up to $8 million USD, though victims have sometimes been offered decryption keys without payment. Victims span sectors such as government, healthcare, education, media, and manufacturing across Southeast Asia, Europe, and the Americas.

Descriptions are compiled from public reporting and vendor research. They describe how a group has historically operated and can lag its current behaviour; the status and timings above are our own.

Current status

Brain Cipher's leak site is answering our checks. That does not mean the group is actively posting — plenty of sites stay up for months with nothing new on them — but the infrastructure is live.

The last change we recorded on it was 17h ago (4 Sep 2026 19:27 UTC).

Which organisations this group has named, and when, is part of the SINON platform rather than this page. Create an account to search it, or to be told automatically if a name you care about turns up.

Sectors targeted

Industries this group has been observed going after, most common first.

This group does not state an industry on its site, so we have nothing reliable to report. Most crews are opportunistic rather than sector-specific in any case — they hit what they can reach.

Leak site capture

Brain Cipher's extortion site as we last captured it, served through our own origin — opening the real thing would put you on their infrastructure.

Capture of the Brain Cipher ransomware leak site

Watching for your name

If Brain Cipher posts your company, a supplier or a subsidiary, you want to hear it from us rather than from a journalist. SINON checks these sites continuously and alerts on the names you give it.

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