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cheersThis record tracks a ransomware attack claimed by the cheers group against https://. It collects the publicly disclosed attack details — sector, location and timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAPWindow Zero is the time the breach stayed in the open before anyone said so — the gap between when the attack was first discovered on the operator's leak site (t1) and when it was publicly disclosed (t2). The wider this window, the longer victims, staff and customers were exposed with no warning.
Attack Summary
Dynam Japan Holdings Co., Ltd is a Japanese company operating in the Other sector, primarily engaged in investment and financial services with no specific geographic location beyond Japan. The firm offers diversified investment solutions and financial management services to clients across the country. It was listed as a ransomware victim associated with the Cheers threat actor, which targets VMware ESXi servers using Linux-based malware. The incident involved double-extortion tactics without confirmed data theft or record counts. No official breach notification date from the company itself has been publicly disclosed.
Leak Screenshots
SAMPLEProof-of-breach screenshots the operator posted from the stolen data. Previews are redacted and locked — the originals are available on HaveIBeenRansom.