RSupport disclosed signs that one internal PC had been infected with malware and that a code-signing certificate used for file integrity verification may have been exposed. The company said it worked with KISA, revoked the existing certificate, replaced it with a new one, and strengthened preventive security checks. The notice states that no damage from the certificate exposure had been confirmed and that KISA was tracing the malware infection route. The main defensive relevance is supply-chain risk from a potentially exposed signing certificate, even though the excerpt does not attribute the incident to any actor.