Elm Grove
bd_02f6b0da631559b6 · schema v1 · pii pii-v1
Full breach record for Elm Grove →Threat-actor claim — not a regulatory filing
This row is a claim by the ransomware group Medusa on its public extortion blog. It has not been validated by the victim or any regulator. Treat attribution and counts as the threat actor's assertion until a regulatory filing or victim disclosure corroborates them.
Source: Ransomware.live
Post text · scraped from the leak site
Elm Grove is a village in Waukesha County, Wisconsin, United States. The population was 6,524 at the 2020 census. Elm Grove was named as America's best suburb by Business Insider in October 2014. Elm Grove government is headed by a village president and overseen by a board of trustees, the seven members of which are elected to two-year terms. The total amount of data leakage is 150.6 GB
J jump to incidentP pin to compareR raw source
Incident timeline — mostly unverified
? — ?
Breach window unknown
May 17, 2024
Claim posted
—
Corroborated · see linked filings
Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.
Claim → filing
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Compliance clock
Not assessable
Linked disclosures
Why this link?Regulatory filings (1) · sorted by filing gap
- HHS OCRbd_acd1d6ae4cac0cbb2024-12-02 · +198dVerified by operator
Filing propagation · 2 filings
View merged incident ↗Pattern: first filing May 17, last Dec 2 (WI) — a 198-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?
Evidence ladder
Attacker assertion only. Establishes: claim date, group, alleged victim.
Unlocks: incident narrative, operational impact. Still no compliance clock.
Unlocks: discovery date, data types, affected count, compliance clock.
Unlocks: materiality, stated response, full audit trail. Ceiling removed.
Source ceiling
- actor name
- victim claim
- ransom/leak status
- discovery date
- materiality
- notification
- affected count
- confirmed data types
- compliance clock
The ✕ fields stay blank until a regulatory filing or victim disclosure lands.
medusa
According to ransomware.live, Medusa is a ransomware-as-a-service operation active since June 2021 that has targeted over 300 victims across critical infrastructure sectors including healthcare, education, legal, and manufacturing using double-extortion, with attacks surging 42% between 2023 and 2024 and a formal CISA advisory issued in early 2025.