HOMETHREATSVIGILANT CLEANER
MALWARE FAMILY

VIGILANT CLEANER

Internal ID: win.vigilant_cleaner
1
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 malware family tracked by threat intelligence researchers and catalogued in the Malpedia dataset. It represents a distinct malicious software lineage with identifiable code characteristics, behaviors, and victimology.

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

TypeMalware Family
Aliases1

Also Known As

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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