APT / THREAT GROUP
MOUSEISLAND
Internal ID: vbs.mouseisland
1
aliases
Last seen:Mar 17, 2026
Intelligence Profile
MOUSEISLAND is a Microsoft Word macro downloader used as the first infection stage and is delivered inside a password-protected zip attached to a phishing email. Based on Fireeye intrusion data from responding to ICEDID related incidents, the secondary payload delivered by MOUSEISLAND has been PHOTOLOADER, which acts as an intermediary downloader to install ICEDID.
Threat Analysis
MOUSEISLAND is a known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of unknown activity patterns.
External References
Quick Facts
TypeAPT / Threat Group
Aliases1
Also Known As
vbs.mouseisland
Research Links
Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.