MCM Construction
bd_d451e23bdb704bc8 · schema v1 · pii pii-v1
Full breach record for MCM Construction →2 incidents on fileThreat-actor claim — not a regulatory filing
This row is a claim by the ransomware group Blacklock 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
Commercial & Residential Construction California, United States <25 Employees MCM Construction is a leading bridge construction company in the USA, known for building over 1000 critical structures across the West. Revenue $26.1 Million
J jump to incidentP pin to compareR raw source
Incident timeline — mostly unverified
? — ?
Breach window unknown
May 30, 2025
Claim posted
—
No filing yet · watching
Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.
Claim → filing
—
Compliance clock
Not assessable
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.
No regulatory filing corroborates this yet — it is the attacker's own assertion. Watch this entity to be notified the moment a filing corroborates or contradicts it.
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.
blacklock
According to ransomware.live, BlackLock is a rebranded version of another ransomware group known as Eldorado. It has since become one of the most active extortion syndicates in 2025, heavily targeting technology, manufacturing, construction, finance, and retail sectors.