TeamPCP's Supply Chain Attack: Unveiling the Telnyx SDK Compromise and Ransomware Expansion
In March 2026, the threat actor TeamPCP executed a sophisticated supply chain attack by compromising the Telnyx Python SDK on the Python Package Index (PyPI). Malicious versions 4.87.1 and 4.87.2 were published, embedding payloads within WAV audio files—a novel steganography technique. These payloads targeted Windows systems by dropping a persistent binary named 'msbuild.exe' into the Startup folder, while Linux and macOS systems faced credential harvesting similar to previous LiteLLM compromises. Forensic analyses confirmed the use of RSA-4096 encryption and specific exfiltration patterns consistent with TeamPCP's tactics. The compromised versions were promptly quarantined by PyPI. Concurrently, TeamPCP partnered with the Vect ransomware-as-a-service operation and BreachForums, distributing affiliate keys to approximately 300,000 users, potentially enabling one of the largest coordinated ransomware deployments observed. Additionally, the LAPSUS$ group claimed a 3GB data breach of AstraZeneca, allegedly using credentials obtained through TeamPCP's activities. This breach reportedly includes internal code repositories, cloud infrastructure configurations, and employee data. Organizations affected by any phase of the TeamPCP campaign are urged to rotate credentials immediately and monitor for indicators of compromise.
Kill Chain
