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Malicious package

@posthog/rrweb-playernpm

Malicious code in @posthog/rrweb-player (npm) Remove it immediately and rotate any exposed credentials.

MAL-2025-190891
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall @posthog/rrweb-player

What this malware does

The package @posthog/rrweb-player was found to contain malicious code.

This package was compromised by the Sha1-Hulud: The Second Coming NPM worm. The malicious payload steals tokens and credentials and publishes them to GitHub. The worm will propogate itself to NPM packages the user owns and establish persistence is a GitHub action. The package may also destroy the user's home directory.

Malicious versions

1 flagged
0.0.31

Indicators of compromise (SHA-256)

7d82edc82839a426c18772dee75ba0a7a9601a053fa6a20b3e7e4b48ac3768d9
2f9939b2bfb450c5cfd34b7a992195a3bfb2c87b6f56f1c342a70c5b2c1e4acb

Detection & response playbook

Credential / info stealer

  1. Find it

    Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for @posthog/rrweb-player (version 0.0.31). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging @posthog/rrweb-player across your stack and pipelines.

  2. If you installed it — respond

    @posthog/rrweb-player 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.

  3. Did it already run?

    If @posthog/rrweb-player 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.

  4. How O3 protects you

    O3 blocks @posthog/rrweb-player 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. @posthog/rrweb-player on npm has been identified as a malicious package (version 0.0.31 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks @posthog/rrweb-player-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