MalwareManufacturingManufacturingRansomwareData ExfiltratedRansom DemandedEmployee Data InvolvedIdentity (basic)Government IDEmploymentMediumContained

HEAVY CONSTRUCTION SYSTEMS SPECIALISTS, INC.

bd_1003dcc4662eaf22 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Oct 18, 2024

Filed

Nov 13, 2025

To disclose

—

Affected

2state residents only

Linked

4 filings

Confidence

66%

Full breach record for HEAVY CONSTRUCTION SYSTEMS SPECIALISTS, INC. →

Heavy Construction System Specialists, LLC (HCSS) notified the Maryland Attorney General of a ransomware attack detected on October 18, 2024. The incident affected 2 Maryland residents (employees/former employees), exposing names, addresses, phone numbers, employee IDs, and Social Security Numbers. HCSS engaged cybersecurity experts and law enforcement, and offered 24 months of credit monitoring via Experian IdentityWorks.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d

Incident timeline

Oct 18, 2024

Discovered

Nov 13, 2025

Filed

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitemedusabd_3b2b6a3616578f4a2024-10-11 · +397dCandidate

Regulatory filings (2) · sorted by filing gap

Texas State AGbd_1c9ce00e4c47f4632026-01-05 · +53dVerified
New Hampshire State AGbd_1ea81b194ebcf1cb2025-01-08 · +309dCandidate

Name: KIRKLAND & ELLIS LLP
norm: kirkland ellis
Domain: kirkland.com

Name: HEAVY CONSTRUCTION SYSTEMS SPECIALISTS, INC.
norm: heavy construction systems specialists
Domain: hcss.com
Industry: Manufacturingllm

Discovered: Oct 18, 2024
Materiality determined: —
Notification sent: Dec 18, 2024
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: Notified Maryland Office of the Attorney General

During the incident: Initiated an investigation with the assistance of leading cybersecurity experts
Engaged third-party experts to quickly ascertain the nature and scope of the incident
Contacted law enforcement
Changes made: Implemented security measures to prevent similar incidents from occurring in the future
Offered complimentary access to Experian IdentityWorks for twenty-four (24) months
Source: Quoted from the filing itself, not independently verified.

Compliance flags: Leak >180d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

New Hampshire State AGJan 8 · first

Maryland State AG+309d · this page

Texas State AG+362d

Pattern: first filing Jan 8 (NH), last Jan 5 (TX) — a 362-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://oag.maryland.gov/resources-info/SBN%20Documents/2025/ITU-376135.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 13, 2025
Raw hash: e890ca35ec5477f9e0f3dfcb34883bdf679e777e1ac14dc81be142ac87047b12

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · sorted by filing gap

Reporting entityKIRKLAND & ELLIS LLP

Victim entityHEAVY CONSTRUCTION SYSTEMS SPECIALISTS, INC.

Incidentdiscovered Oct 18, 2024

Stated responseInitiated an investigation with the assistance of leading cybersecurity experts

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenanceoag.maryland.gov