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SleeperGem Uses Three Malicious RubyGems Packages to Target Developer Machines

The SleeperGem supply chain attack leverages compromised RubyGems packages to install persistent backdoors on developer machines.

By · Published July 22, 2026 at 16:24 UTC · Updated July 23, 2026 at 03:42 UTC

4sources
4articles
2velocity
+0%since first seen
45d agofirst detected

Evidence dossier

Intelligence passport

53/100 Publishable
4distinct sources shown
40velocity measurements
1language editions checked
All brief claims passed the second-source checkbrief evidence status

Measured timeline

  1. Detected The first matching coverage entered the Archynetys cluster.
  2. Latest coverage observed Most recent article currently attached to this story cluster.
  3. Peak measured velocity The recorded velocity reached 2.
  4. Evidence threshold reached The story had enough independent coverage for an explanatory brief.
  5. Outcome review added Archynetys revisited the signal after coverage cooled.

Source diversity sample: cyberpress.org · Aikido Security · StepSecurity · The Hacker News.

How this dossier is built: methodology · AI policy · corrections.

📍 Where it landed

SleeperGem involved a supply chain attack targeting dormant maintainer accounts to target developer machines. The operation used the compromised RubyGems packages git_credential_manager, Dendreo, and fastlane to drop a persistent backdoor.

The story quieted without a definitive conclusion in the coverage.

Epilogue added 43d ago, after coverage quieted.

Velocity

How fast coverage is spreading — measured hourly from article rate × source diversity. How this works →

Where it stands

A supply chain attack dubbed SleeperGem has targeted developer machines using three malicious RubyGems packages: git_credential_manager, Dendreo, and fastlane. The campaign involves the use of compromised dormant maintainer accounts to distribute the threat.

Coverage from The Hacker News, StepSecurity, and Aikido Security emphasizes the use of these specific packages to drop a persistent backdoor. Additionally, cyberpress.org reports that North Korean hackers are utilizing SVG images to hide OTTERCOOKIE malware for the purpose of backdooring developers.

Future monitoring will focus on the persistence of the backdoors and the activity surrounding the compromised maintainer accounts mentioned in the reports.

Synthesized by Archynetys from the headlines below under a strict no-invention contract. ✓ fact-checked: all claims supported by sources Updated 44d ago.

The reporting (4)

Answered

Which RubyGems packages were affected by SleeperGem?

The affected packages are git_credential_manager, Dendreo, and fastlane.

How did the attackers gain access to the packages?

According to Aikido Security, the attack targeted dormant maintainer accounts.

What malware is associated with the North Korean hackers in this context?

Cyberpress.org reports the use of OTTERCOOKIE malware hidden within SVG images.

Topics

SleeperGem RubyGems OTTERCOOKIE Supply Chain Attack

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