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Malicious package

gen-ai-opt-innpm

Advisory published Updated

gen-ai-opt-in is a confirmed malicious npm package (MAL-2026-6761) that opens a backdoor for remote access (malicious versions 99.0.0, 99.0.1, 99.0.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in gen-ai-opt-in (npm)

MAL-2026-6761
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall gen-ai-opt-in

What this malware does

On npm install, postinstall.js executes automatically and collects installer host identifiers (os.hostname(), os.userInfo().username) plus public IP/geo data fetched from ip-api.com (city, region, country, ISP, org), then transmits them as query-string parameters over plain HTTP to a hardcoded Burp Collaborator subdomain at p1r2d74iwjk057raam6myf7e258wzkt8i.oastify.com. The package ships no legitimate functionality — the tarball's only effect is the recon beacon. The name 'gen-ai-opt-in' combined with version 99.0.2 (an artificially inflated version number) and an empty description matches the dependency-confusion attack shape, where a public package is published to override an organization's internal package of the same name so that a compromised internal build resolves the attacker's copy and executes the postinstall.

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 'gen-ai-opt-in' @ 99.0.2 (npm) as malicious.

It is considered malicious because:

  • The package communicates with a domain associated with malicious activity.

Malicious versions

3 flagged
99.0.099.0.199.0.2

Indicators of compromise (SHA-256)

f727264d43e45f813a3ce1cc7cb7e59a763ea8a59f93a9af3593bdb40c8bb47b
371ed0f5f59f881d5fa2a296e7e3d44833f1ae46129da09714cab2edadcf440a
17cc3c470c798cb01e71c8e8d0433e1d63eaf1fdcc5c9792f40059b65bc5eb49
3653831a01d3068b12688a9f6ae11926a1b1edde27f8f37a6c48f3f0dba99231
40fd78cc8cbd3de5b23d555b528ae347abe2e3fe990d594574075e4b80332f40

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for gen-ai-opt-in (3 malicious versions).

  2. If you installed it — respond

    gen-ai-opt-in 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 gen-ai-opt-in 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. gen-ai-opt-in on npm has been identified as a malicious package (versions 99.0.0, 99.0.1, 99.0.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GHSA-jwrj-q2c7-8g47IN-MAL-2026-008083IN-MAL-2026-008084IN-MAL-2026-008079

References

Credits

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

Detect & block this

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

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database
gen-ai-opt-in (npm) malicious package — MAL-2026-6761 | O3 Security