Leak site not responding

Bluesky ransomware group

Bluesky 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 3y ago.

Leak site statusOfflinenot answering

Tracked since—no dated record

Last activity3y ago17 Oct 2023 18:13 UTC

Sectors observed—none stated

Who they are

BlueSky ransomware first emerged in July 2022 and is characterized by aggressive, high-speed file encryption using a multithreaded architecture. Written with code elements reminiscent of Conti v3, it encrypts files using ChaCha20 secured with RSA‑4096, and further employs Curve25519 for key agreement. Delivery commonly comes through trojanized downloads from risky websites (e.g., “crack” or “keygen” hosts) or phishing emails. The malware also spreads laterally via SMB and evades detection by hiding threads using NtSetInformationThread. Once deployed, it renames encrypted files with the .bluesky extension and drops ransom notes in both HTML and TXT formats. Unlike double-extortion threats, BlueSky does not operate a public leak site and appears focused solely on disrupting file access. Observed activity spans large enterprises to SMBs, but the volume of attacks remained relatively low through early 2023.

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

Bluesky's leak site is not answering. Sites go dark for infrastructure trouble, a deliberate quiet period, or a takedown, and a good number return weeks later under the same name, so the entry stays on the list either way.

The last change we recorded on it was 3y ago (17 Oct 2023 18:13 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.

Watching for your name

If Bluesky 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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