HOMETHREATSVIGILANT CLEANER
APT / THREAT GROUP

VIGILANT CLEANER

3
aliases
Last seen:Mar 17, 2026

Intelligence Profile

Wiper malware discovered by Japanese security firm Mitsui Bussan Secure Directions (MBSD), which is assumed to target Japan, the host country of the 2021 Summer Olympics. In addition to targeting common file Office-related files, it specifically targets file types associated with the Japanese word processor Ichitaro.

Threat Analysis

VIGILANT CLEANER 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://blog.cyble.com/2021/08/02/a-deep-dive-analysis-of-a-new-wiper-malware-disguised-as-tokyo-olympics-document/
→https://blog.trendmicro.co.jp/archives/28319
→https://therecord.media/wiper-malware-targeting-japanese-pcs-discovered-ahead-of-tokyo-olympics-opening/
→https://www.fortinet.com/blog/threat-research/wiper-malware-riding-tokyo-olympic-games
→https://www.mbsd.jp/research/20210721/blog/

Quick Facts

TypeAPT / Threat Group
Aliases3

Also Known As

win.vigilant_cleanerVIGILANT CLEANERVIGILANT CHECKER

External Intelligence

Malpedia: win.vigilant_cleaner

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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