The nation-state threat actor known as MirrorFace has been observed deploying malware dubbed ROAMINGMOUSE as part of a cyber espionage campaign directed against government agencies and public institutions in Japan and Taiwan.
The activity, detected by Trend Micro in March 2025, involved the use of spear-phishing lures to deliver an updated version of a backdoor called ANEL.
“The ANEL file from
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