APT / THREAT GROUP

MOUSEISLAND

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

→https://www.fireeye.com/blog/threat-research/2021/02/melting-unc2198-icedid-to-ransomware-operations.html

Quick Facts

TypeAPT / Threat Group

Aliases2

Also Known As

MOUSEISLANDvbs.mouseisland

External Intelligence

Malpedia: vbs.mouseisland

Research Links

MITRE ATT&CK VirusTotal Google (news) Twitter/X search

Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.

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