Which versions of swcalcalc are malicious?

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

How do I remediate swcalcalc if I installed it?

Remove swcalcalc 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 swcalcalc — how do I know if it already compromised me?

If swcalcalc 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 swcalcalc part of a known attack campaign?

Yes — swcalcalc is associated with the RLMA-2026-03574, RLUA-2026-09487 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 swcalcalc across my projects, lockfiles, and CI pipelines?

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

Malicious package

swcalcalcRubyGems

Advisory published Jul 7, 2026Updated Sep 24, 2026

swcalcalc is a confirmed malicious RubyGems package (MAL-2026-8923) 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 swcalcalc (RubyGems)

MAL-2026-8923

Immediate action

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

gem uninstall swcalcalc

Malicious versions

1 flagged

0.0.1

Indicators of compromise (SHA-256)

48bc36717adc64828c7f6f7588a3ed5c6ecf1926fa3645616ef438af06201cde

0865d12bc93599770e83bf829ef0522a1aef8f88a5e9311e609037299479f89c

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for swcalcalc (version 0.0.1).
If you installed it — respond
Remove swcalcalc 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 swcalcalc 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. swcalcalc 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-2026-03574RLUA-2026-09487

References

github.com

Credits

ReversingLabs · finder

Detect & block this

O3 blocks swcalcalc-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

Explore

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