O'Shea Builders
bd_e9fb850b33b303e9 · schema v1 · pii pii-v1
Full breach record for O'Shea Builders →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
O'Shea Builders (founded in 1902) is a commercial construction-services provider in Illinois with offices in Springfield and Peoria. O'Shea Builders provide general contracting, construction management, design build, civil and building maintenance services. O'Shea Builders corporate office is located in 3401 Constitution Dr, Springfield, Illinois, 62711, United States and has 137 employees. The total amount of data leakage is 120.50 GB
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Incident timeline — mostly unverified
? — ?
Breach window unknown
Mar 28, 2025
Claim posted
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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
- Indiana State AGbd_4225ddd35277fc9a2025-08-01 · +125dVerified
Filing propagation · 2 filings
View merged incident ↗Pattern: first filing Mar 28, last Aug 1 (IN) — a 125-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.