Leak site responding

Arcus Media ransomware group

Arcus Media 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 24earliest record we hold

Last activity17h ago4 Sep 2026 19:00 UTC

Sectors observed—none stated

Who they are

Arcus Media first emerged in May 2024 and operates as a Ransomware-as-a-Service (RaaS) with a double-extortion model—encrypting data and threatening to leak it if the ransom isn't paid. The group leverages advanced capabilities including selective encryption (partial encryption of large files with the ChaCha20 cipher and RSA‑2048 key protection), privilege escalation, disabling recovery mechanisms, and terminating critical services like SQL servers and email clients to maximize disruption and thwart defense. Initial access comes through phishing, credential theft, or exploitation of vulnerabilities, with lateral movement facilitated by tools like Mimikatz and Cobalt Strike. Since its debut, Arcus Media has — by mid‑2025 — been linked to 50+ confirmed attacks, spanning industries such as business services, retail, media, healthcare, and manufacturing across the Americas, Europe, and Asia. Victims include high-profile targets like Braz Assessoria Contábil and FILSCAP.

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

Arcus Media'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 19:00 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

Arcus Media'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 Arcus Media ransomware leak site

Watching for your name

If Arcus Media 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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