Mmastodon TechnologyCybersecurity first seen 3 d ago, last 3 d ago, peak #4

Researchers Detail RFRx003 Linux Backdoor Used in Targeted Attack

Original: (rt-solar.ru) Analysis of RFRx003: A Custom Linux Backdoor for Stealthy Lateral Movement and Data Exfiltration In brief

Security researchers at RT-Solar have published an analysis of RFRx003, a custom Linux backdoor used in a 2026 attack on an IT company. The malware enabled attackers to maintain long-term persistence, move laterally across networks, and quietly exfiltrate data. Commenters in the cybersecurity community are sharing the write-up for its technical detail on stealth techniques.

Why now: New technical research on a sophisticated stealthy Linux backdoor is drawing attention from security practitioners.

RT-SolarRFRx003

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Evidence

• (rt-solar.ru) Analysis of RFRx003: A Custom Linux Backdoor for Stealthy Lateral Movement and Data Exfiltration In brief - This article describes a sophisticated cyberattack from 2026 targeting an IT company, where attackers used a custom backdoor to maintain long-term… · orlysec@swecyb.com · 2

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