Topic: backdoor malware

Microsoft: SesameOp Malware Exploits OpenAI API in Attacks

November 5, 2025

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Microsoft: SesameOp Malware Exploits OpenAI API in Attacks

Microsoft discovered the SesameOp backdoor, which exploits the OpenAI Assistants API as a covert command-and-control channel to maintain persistent access in compromised systems. The malware evades detection by using legitimate cloud services for communication, blending malicious traffic with nor...

China-Linked Hackers Exploited Dell Zero-Day Since 2024

A China-linked cyberespionage group exploited a critical Dell software vulnerability (CVE-2026-22769) for over a year, using it to implant stealthy backdoors and maintain persistent access in targeted networks. The attackers deployed advanced tools like the BRICKSTORM and GRIMBOLT backdoors, move...

APT37 Breaches Air-Gapped Networks with New Malware

North Korean state-sponsored hackers (APT37) are using a novel toolkit called Ruby Jumper to breach sensitive air-gapped networks by exploiting removable USB drives as a covert bridge. The multi-stage infection begins with a malicious shortcut file and deploys a chain of tools, including the REST...