SystemBC Malware: How Infected VPS Systems Became a Global Proxy Highway (2025)
In September 2025, security researchers from Lumen Technology’s Black Lotus Labs uncovered a significant increase in the activity of the SystemBC proxy botnet, which compromised an average of 1,500 commercial virtual private servers (VPS) daily by exploiting unpatched and critically vulnerable systems. SystemBC enabled threat actors, including ransomware gangs and criminal proxy networks, to route malicious traffic through infected VPS infrastructures, obscuring command-and-control activity and facilitating large-scale cyberattacks, such as WordPress brute-forcing and malware distribution. Impacted servers often had dozens of security flaws, with infection lifespans exceeding a month and some systems exhibiting over 100 vulnerabilities. The prevalence of SystemBC underscores a growing shift away from traditional residential botnets toward high-bandwidth, stable VPS resources easily abused due to lax patching. The incident amplifies urgent concerns around lateral movement, proxy abuse, and the need for robust network segmentation and real-time anomaly detection as attackers leverage compromised enterprise-grade infrastructure for persistent threats.
Kill Chain