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Malicious package

zvfossilc41xzth215RubyGems

Advisory published Updated

zvfossilc41xzth215 is a confirmed malicious RubyGems package (MAL-2026-9814) that executes malicious code on install (malicious version 0.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in zvfossilc41xzth215 (RubyGems)

MAL-2026-9814
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
gem uninstall zvfossilc41xzth215

Malicious versions

1 flagged
0.0.1

Indicators of compromise (SHA-256)

73a72d915bf807478abef11d00c370fd3f950f6134dc1e694c26945e9723c2c1
00df70cb2d4b1df842146f0b41ee31cbde8a77f054684ba8b34761e703d34426

Detection & response playbook

Malicious package
  1. Find it

    Search your lockfiles and build artifacts for zvfossilc41xzth215 (version 0.0.1).

  2. If you installed it — respond

    Remove zvfossilc41xzth215 from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

  3. Did it already run?

    If zvfossilc41xzth215 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. zvfossilc41xzth215 on RubyGems has been identified as a malicious package (version 0.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-04465RLUA-2026-10403

References

Credits

  • ReversingLabs · finder

Detect & block this

O3 blocks zvfossilc41xzth215-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Explore

zvfossilc41xzth215 (RubyGems) malicious package — MAL-2026-9814 | O3 Security