Which versions of @siriusbeyond/auth are malicious?

The following npm versions of @siriusbeyond/auth are flagged malicious: 99.0.0. Treat any of these as compromised.

How do I remediate @siriusbeyond/auth if I installed it?

@siriusbeyond/auth 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 @siriusbeyond/auth — how do I know if it already compromised me?

If @siriusbeyond/auth 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 @siriusbeyond/auth part of a known attack campaign?

Yes — @siriusbeyond/auth is associated with the IN-MAL-2026-020219 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 @siriusbeyond/auth across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for @siriusbeyond/auth (version 99.0.0).

Malicious package

@siriusbeyond/authnpm

Advisory published Sep 20, 2026Updated Sep 21, 2026

@siriusbeyond/auth is a confirmed malicious npm package (MAL-2026-16320) that steals credentials and exfiltrates sensitive data (malicious version 99.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @siriusbeyond/auth (npm)

MAL-2026-16320

Immediate action

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

npm uninstall @siriusbeyond/auth

What this malware does

Package @siriusbeyond/[email protected] registers both preinstall and postinstall lifecycle scripts that execute callback.js on every npm install. callback.js collects installer host identifiers (hostname, username, platform, cwd, homedir, CI/cloud indicators, npm registry) together with a filtered list of environment variable names matching token/secret/key/password/aws/npm/git patterns, and POSTs a Markdown report to https://api.telegram.org/bot<token>/sendMessage using a hardcoded bot token and chat_id 1064260758 embedded in the source. The lifecycle commands are wrapped in 2>/dev/null || true to suppress errors and hide the beacon from install output. The version number 99.0.0 and private-scope name are the standard dependency-confusion shape targeting the @siriusbeyond scope, causing internal builds that reference that scope to resolve to this public package and beacon out. The package's self-description as a 'Dependency Confusion PoC / security research' does not change the runtime behavior: installer-owned data leaves every machine that installs it to an author-controlled Telegram channel.

The OpenSSF Package Analysis project identified '@siriusbeyond/auth' @ 99.0.0 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.

Malicious versions

1 flagged

99.0.0

Indicators of compromise (SHA-256)

4ed929a2d8cbd15860eaafb9eb773ad02f9b31f361514b47987eca8dfa1ae695

1d6b359a24803199b8b8cbc77aed1c8ceac0706a76db4ec00a9964bf1f8b1e37

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for @siriusbeyond/auth (version 99.0.0).
If you installed it — respond
@siriusbeyond/auth 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 @siriusbeyond/auth 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. @siriusbeyond/auth on npm has been identified as a malicious package (version 99.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-020219

References

npmjs.com

Credits

Amazon Inspector · finder
OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks @siriusbeyond/auth-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

All malware advisories How O3 detects malware Vulnerability database