Which versions of stellarfixer are malicious?

The following npm versions of stellarfixer are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate stellarfixer if I installed it?

stellarfixer is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed stellarfixer — how do I know if it already compromised me?

If stellarfixer was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Is stellarfixer part of a known attack campaign?

Yes — stellarfixer is associated with the IN-MAL-2026-015811 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find stellarfixer across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for stellarfixer (version 1.0.0).

Malicious package

stellarfixernpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

stellarfixer is a confirmed malicious npm package (MAL-2026-13353) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in stellarfixer (npm)

MAL-2026-13353

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall stellarfixer

What this malware does

On npm install, the package's postinstall script unconditionally executes a bundled Windows PE at bin/stellarfn.exe via execFileSync. The binary is a.NET remote-access trojan: it opens a socket-based C2 channel (ClientSocket/BeginConnect/ConnectServer, SendMSG, SendBot/ChatID) with plugin loading (WriteAllBytes/ReadAllBytes), installs a low-level keyboard hook (SetWindowsHookEx + WH_KEYBOARD_LL + LowLevelKeyboardProc + ToUnicodeEx) tagged with active-window titles (GetForegroundWindow/GetActiveWindowTitle) for system-wide credential-grade keystroke capture, captures webcam frames (capCreateCaptureWindowA/capGetDriverDescriptionA), propagates to removable drives (USBThread/USBStart/USBSpread/RunDisk), and includes AV-exclusion, SetCurrentProcessIsCritical anti-kill, AES payload encryption, and an uninstaller. Installing this package on a Windows host results in immediate full-host compromise, remote attacker control, credential theft, and worm-like USB propagation.

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

bd3a96aa989ed6cadd106e8e7d04317ea30f83434a40eabc307578cb0690b78f

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for stellarfixer (version 1.0.0).
If you installed it — respond
stellarfixer is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If stellarfixer was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. stellarfixer on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015811

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks stellarfixer-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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