MalwarePublished 5 Aug 2026Updated 6 Aug 2026

@ccfly/setup-darwin-x64 (npm) · Malicious Code

Affects @ccfly/setup-darwin-x64Source GCVE Database

Malicious package : remove @ccfly/setup-darwin-x64 and rotate any secrets on hosts that installed it.

Data as of 6 Aug 2026, 18:24 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-12313

What to do

Remove @ccfly/setup-darwin-x64 from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npm@ccfly/setup-darwin-x64	Affected =0.1.7	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (409d11825a61bed068425296e83dcc0c87427579f7b5d724ec52e5e87465f2b5) The package ships a prebuilt darwin/x64 Mach-O binary containing a Go agent (module github.com/ccfly/rescue) that, when executed, connects to a hardcoded remote broker at cc.hn / ccfly over WebSocket (ws://ccfly, wss://, https://cc.hn) using github.com/gorilla/websocket, spawns a pseudo-terminal via github.com/creack/pty, and pipes the WebSocket stream into that PTY. Symbols include agent.serve, agent.startPTY, agent.waitAuthorized, agent.wsBase and unixPTY.Read/Write/Resize/Close, giving the remote party interactive shell control of the host. A second stage (setup.downloadCcfly, setup.fetchAndExtract, setup.npmTarballURL, setup.extractFromTarGz, setup.runCcflyInstall, setup.redeemEnrollToken, setup.(*brokerClient).escalateToRescue, with a rodata reference to https://registry.npmjs.org) fetches and executes a further ccfly npm tarball after the broker approves an enrollment token — the additional code executed on the host is chosen by the remote broker, not the installer. The binary also inspects shell RC files and /etc/hosts (setup.scanShellProfilesForProxy, setup.checkProxyResidue, setup.checkHostsResidue, setup.runEnvChecks, setup.envReport) and POSTs an environment report back to the broker (setup.(*brokerClient).post; rodata latest.zshrc, export.ccfly).

Impact

Successful execution of this package results in full remote shell access to the affected macOS host, enabling arbitrary command execution by the attacker. The attacker can also gather environment information and dynamically deploy further malicious payloads, significantly compromising host confidentiality, integrity, and availability.

Defensive guidance

Users should avoid installing or using @ccfly/setup-darwin-x64 version 0.1.7. Remove any installations of this package and audit affected systems for signs of compromise. Monitor for connections to the indicated broker domains and consider network-level blocking of these endpoints.

Summary

The @ccfly/setup-darwin-x64 npm package (version 0.1.7) includes a Mach-O binary that runs a Go agent connecting to a hardcoded remote broker over WebSocket. The agent spawns a pseudo-terminal and pipes the WebSocket stream into it, granting the remote party interactive shell access. The binary inspects local shell RC files and /etc/hosts, reporting environment details back to the broker. It also supports a second stage where, upon broker approval, it downloads and executes additional npm tarballs with arbitrary code chosen by the attacker. This design allows persistent and flexible remote control of the infected host.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Aug 2026, 17:22 UTC

Technical details

References

Community reviews