Which versions of swcossfabc are malicious?

The following RubyGems versions of swcossfabc are flagged malicious: 0.0.1. Treat any of these as compromised.

How do I remediate swcossfabc if I installed it?

Remove swcossfabc 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.

I already installed swcossfabc — how do I know if it already compromised me?

If swcossfabc 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.

Is swcossfabc part of a known attack campaign?

Yes — swcossfabc is associated with the RLMA-2026-03580, RLUA-2026-09493 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 swcossfabc across my projects, lockfiles, and CI pipelines?

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

Malicious package

swcossfabcRubyGems

Advisory published Jul 7, 2026Updated Sep 24, 2026

swcossfabc is a confirmed malicious RubyGems package (MAL-2026-8929) 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 swcossfabc (RubyGems)

MAL-2026-8929

Immediate action

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

gem uninstall swcossfabc

Malicious versions

1 flagged

0.0.1

Indicators of compromise (SHA-256)

b6a6a25e9d3b50190ca14070ea5f61ed1a569836fb478ce9239ce1927c511ef0

e23f3793b87a5a013cf14e9185fc7dfb8e7d434a8c40a6dae9a3b5c7a7bd31ab

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for swcossfabc (version 0.0.1).
If you installed it — respond
Remove swcossfabc 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.
Did it already run?
If swcossfabc 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. swcossfabc 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-2026-03580RLUA-2026-09493

References

github.com

Credits

ReversingLabs · finder

Detect & block this

O3 blocks swcossfabc-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.

Malware detection Runtime egress monitoring

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