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Miasma Worm Supply Chain Attack Compromises 73 Microsoft GitHub Repositories

Key Findings A self-replicating worm called Miasma compromised 73 Microsoft GitHub repositories across Azure infrastructure and core .NET, Go, Java, JavaScript, and Python frameworks GitHub staff disabled affected repositories after attackers injected malicious workflows that harvested OIDC tokens and developer credentials The attack exploited AI coding tools as an automatic execution mechanism, triggering malware when developers cloned infected repos and opened them in IDEs

Jun 93 min read

Critical Miasma Worm Campaign Targets Microsoft and Red Hat in Expanding Supply Chain Attack Wave

Key Findings Miasma worm infected 73 Microsoft GitHub repositories across Azure, Azure-Samples, Microsoft, and MicrosoftDocs organizations, forcing GitHub to disable access Attack represents re-compromise of previously infected "durabletask" PyPI package, suggesting threat actors maintained persistent access for over a month Miasma operates as self-replicating malware variant of Mini Shai-Hulud worm, exploiting the trust model of package registries rather than technical vulne

Jun 64 min read