Sha1-Hulud is a newly identified cyber threat involving supply chain compromise and covert command and control (C2) communications using application layer protocols. Attackers exploit link-local IP addresses such as 169.254.169.254 and 169.254.170.2, commonly associated with cloud metadata services, to bypass perimeter defenses and blend malicious traffic with legitimate communications. A JavaScript component named bun_environment.js has been identified as part of the attack chain.
This report discusses open-source intelligence (OSINT) related to disrupting active exploitation of vulnerabilities in on-premises SharePoint deployments. The threat involves multiple advanced persistent threat (APT) groups such as APT31, Emissary Panda, and Storm-2603, leveraging techniques including exploitation of public-facing applications, PowerShell execution, web shells, reflective code loading, and automated data collection. No specific CVE or technical details are provided, and no patch is currently available. The threat is assessed as high severity due to active exploitation and involvement of sophisticated threat actors.
