Microsoft's Digital Crimes Unit, supported by law enforcement, has disrupted Fox Tempest, a 'malware-signing-as-a-service' offering that abused Azure Artifact Signing (formerly Trusted Signing) to issue legitimate Microsoft-signed certificates for malware. Operators created more than 1,000 certificates and hundreds of Azure tenants using stolen US and Canadian identities, all valid for 72 hours to reduce takedown risk. Microsoft has revoked the certificates, seized the signspace[.]cloud domain, and taken hundreds of supporting VMs offline. The service signed Oyster, Lumma Stealer, Vidar, and ransomware payloads for Rhysida, Akira, INC, Qilin, and BlackByte, used by groups including Vanilla Tempest and Storm-0501.
Two days after the Mini Shai-Hulud worm tore through TanStack and Mistral AI packages, the named-victim count grew sharply. OpenAI confirmed that two employee devices were compromised through the TanStack supply-chain chain and that a limited subset of internal source code repositories had credential material exfiltrated; the company is rotating its macOS code-signing certificates and tells Mac users they must update ChatGPT Desktop, Codex, and Atlas apps by June 12, 2026, or the apps will stop launching. TeamPCP separately listed 450 Mistral AI private repositories on a criminal forum for 25,000 dollars. Mistral confirmed a codebase management system was temporarily compromised on May 12 but says hosted services and user data were not impacted.
TrustStrike Labs