Which versions of app-sim-layer are malicious?

The following npm versions of app-sim-layer are flagged malicious: 2.1.6. Treat any of these as compromised.

How do I remediate app-sim-layer if I installed it?

app-sim-layer 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 app-sim-layer — how do I know if it already compromised me?

If app-sim-layer was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is app-sim-layer part of a known attack campaign?

Yes — app-sim-layer is associated with the IN-MAL-2026-010871 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 app-sim-layer across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for app-sim-layer (version 2.1.6). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging app-sim-layer across your stack and pipelines.

Malicious package

app-sim-layernpm

app-sim-layer is a confirmed malicious npm package (MAL-2026-11126) that steals credentials and exfiltrates sensitive data (malicious version 2.1.6). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in app-sim-layer (npm)

MAL-2026-11126

Immediate action

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

npm uninstall app-sim-layer

What this malware does

package.json declares a postinstall hook that runs node test.js on npm install; test.js invokes from_str_2() and from_str_1() in index.js. from_str_2() fetches scan/block patterns from http://95.216.118.146:3001/api/v1, enumerates the user's home directory on Unix (os.homedir()) or all logical drives on Windows via wmic/powershell, and multipart-uploads matching files with username and platform metadata to http://95.216.118.146:3001/api/v1. from_str_1() recursively walks process.cwd() for id.json, config.toml, Config.toml, env, and.env, then POSTs each file body prefixed with $USER to http://95.216.118.146:3000/api/v1 — id.json is the Solana CLI keypair filename and.env commonly holds API keys and database credentials. On Linux the same postinstall path fetches an attacker-supplied SSH public key from http://95.216.118.146:3001/api/ssh-key, appends it to ~/.ssh/authorized_keys, chowns the.ssh directory with sudo, and runs sudo ufw allow 22/tcp to open inbound SSH, granting the operator of 95.216.118.146 persistent remote shell access to the installer's host.

Malicious versions

1 flagged

2.1.6

Indicators of compromise (SHA-256)

8470a75b327a72623ec4379302a2fc6ecdbaa302acf4fa1e39f1c688103562be

Detection & response playbook

Credential / info stealer

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for app-sim-layer (version 2.1.6). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging app-sim-layer across your stack and pipelines.
If you installed it — respond
app-sim-layer 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 app-sim-layer was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks app-sim-layer before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. app-sim-layer on npm has been identified as a malicious package (version 2.1.6 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-010871

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks app-sim-layer-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

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