Large-Scale "LLMjacking" Campaign Exploits Exposed AI Endpoints for Profit Researchers at Pillar Security have uncovered a sophisticated cybercrime operation dubbed "Bizarre Bazaar", one of the first documented cases of "LLMjacking" a campaign targeting exposed or poorly secured AI infrastructure for financial gain. Over a 40-day period, the team recorded over 35,000 attack sessions on their honeypots, revealing a coordinated effort to monetize unauthorized access to large language model (LLM) endpoints. The campaign exploits misconfigured or unauthenticated AI services, including self-hosted LLMs, exposed APIs, publicly accessible Model Context Protocol (MCP) servers, and development environments with public IP addresses. Attackers frequently target Ollama endpoints on port 11434, OpenAI-compatible APIs on port 8000, and unauthenticated production chatbots, often striking within hours of a misconfigured endpoint appearing in Shodan or Censys scans. Once compromised, threat actors leverage the access for multiple malicious purposes: - Cryptocurrency mining using stolen computing resources - Reselling API access on darknet markets - Exfiltrating sensitive data from prompts and conversation histories - Pivoting into internal systems via MCP servers for lateral movement Pillar Security’s report highlights a criminal supply chain involving three distinct threat actors. The first scans the internet for vulnerable endpoints, the second validates and tests access, and the third operates Silver[.]inc, a commercial service advertised on Telegram and Discord that resells access to compromised AI infrastructure. The platform, marketed under the name NeXeonAI, claims to provide access to over 50 AI models from major providers in exchange for cryptocurrency or PayPal payments. The operation has been attributed to a threat actor using the aliases "Hecker," "Sakuya," and "LiveGamer101." While Bizarre Bazaar focuses on LLM API abuse, Pillar Security is tracking a separate but potentially related campaign targeting MCP endpoints, which offers greater opportunities for lateral movement including Kubernetes interactions, cloud service access, and shell command execution. As of the latest findings, the campaign remains active, with SilverInc’s service still operational. The full scope of the operation and its potential connections to other threat groups are still under investigation.