Was stonehillcontracting.com hit by ransomware?

stonehillcontracting.com was listed by the Abyss ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Abyss ransomware group?

Abyss is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the stonehillcontracting.com breach?

Abyss published data attributed to stonehillcontracting.com (~176 GB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Stone Hill Contracting Co., Inc.

listed as stonehillcontracting.com · Claimed by Abyss · listed 3 years ago

176 GB

Data size

40m

Age

since listed · data leaked

Status timeline

ListedMar 21, 2023
Data leakeddate unknown

At a glance

Group: Abyss
Status: Data leaked
Country: United States
Sector: Construction
Listed on leak site: Mar 21, 2023
Data size: 176 GB

About the victim

AI dossier — public-source company profile

Stone Hill Contracting Co., Inc. is an employee-owned construction company based in Doylestown, Pennsylvania, founded in 1981. The company specializes in the construction of water and wastewater treatment facilities, landfills, bridges, and water retention projects, serving private, public, and municipal clients throughout the Mid-Atlantic region of the United States. Stone Hill is also active in design-build construction and is a member of multiple industry associations including AWWA, DBIA, and WEF.

Industry: Water & Wastewater Infrastructure Construction
Address: PO Box 1370, Doylestown, PA 18901
Founded: 1981

Attack summary

Severity: high — 176 GB of data has been confirmed exfiltrated and published. The company works with public and municipal clients on critical water and wastewater infrastructure, meaning the data likely includes sensitive project details, employee PII, and municipal/government contract information, representing significant business and potentially sensitive infrastructure data.

The Abyss ransomware group claims to have exfiltrated 176 GB of uncompressed data from Stone Hill Contracting Co., Inc., with the disclosed status indicating the data has been published. No ransom amount was stated.

high

Data the group says was taken

AI dossier — extracted from the leak post

Business/operational documents
Project files
Financial records
Employee data
Client/municipal contract records

What the group claims

Stone Hill Contracting, Inc. 176Gb uncompressed data

Sources

Victim sitestonehillcontracting.com

Source

Indexed 3 years ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About Abyss

Abyss is a relatively new ransomware group that emerged in March 2023, operating with primarily financial motivations and targeting organizations across multiple sectors with a focus on English-speaking countries. The group's origin and affiliations remain largely undocumented by major security agencies, though their targeting patterns suggest they operate independently rather than as a Ransomware-as-a-Service model. Their attack methodology and specific tools have not been extensively documented by major threat intelligence firms, though their victim profile of 87 organizations indicates they employ effective initial access techniques to compromise business services, technology, healthcare, and agriculture sectors. The group demonstrates a clear geographic preference for targets in the United States, United Kingdom, Canada, Switzerland, and Hong Kong, suggesting either language preferences or specific regional access capabilities. Due to the group's recent emergence and relatively limited public documentation from established security researchers, detailed information about notable campaigns, encryption methods, or law enforcement actions remains scarce. Abyss appears to remain active as of current reporting, though the lack of extensive public analysis by major threat intelligence organizations suggests they may operate at a smaller scale compared to more prominent ransomware families. The group has been linked to 103 public disclosures across our corpus. First observed on a leak site on March 21, 2023; most recent post June 7, 2026. The operation is currently active.

Timeline of this disclosure

March 21, 2023stonehillcontracting.com listed by Abysson the group's public leak site

Data size: 176 GB

Other recent disclosures by Abyss

Abyss has been linked to 103 public victims on Darkfield. A sample of the most recent:

See the full Abyss dossier →

Sector and geography

This disclosure adds to ransomware activity in the Construction sector, which has 988 disclosures indexed across all operators we track. Geographically, stonehillcontracting.com is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Abyss means stonehillcontracting.com appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on Abyss's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.