DNS exfiltration
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OpenAI patches ChatGPT data leak bug, researchers say
OpenAI patched a ChatGPT flaw on February 20, 2026, after researchers said a malicious prompt could leak chat messages, uploaded files and other sensitive data through a hidden DNS-based channel.
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PDFSider backdoor deployed on Fortune 100 finance firm network
A Resecurity technical analysis found PDFSider, a Windows backdoor, was used to deliver ransomware on a Fortune 100 finance firm’s network. The malware uses DLL side-loading, memory-only execution, DNS exfiltration, and AES-256-GCM encryption.
