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Olson & Co. Steel

listed as olsonsteel.com · Claimed by Blackbasta · listed 2 years ago

27m
Age
since listed · data leaked

Status timeline

  1. ListedMay 4, 2024
  2. Data leakeddate unknown

At a glance

Group
Blackbasta
Status
Data leaked
Country
United States
Sector
Business Services
Listed on leak site
May 4, 2024

About the victim

AI dossier — public-source company profile

Olson & Co. Steel is a premier steel contractor providing steel fabrication, erection, and specialty construction services. Formed in 2002 from the consolidation of Bostrom Bergen Metal Products and Meddco Metals, with roots in the industry dating to 1960, the company serves major clients in commercial, healthcare, education, and infrastructure sectors across California.

Industry
Steel Fabrication, Erection & Specialty Construction
Address
1941 Davis Street, San Leandro, CA 94577, USA
Founded
2002

Attack summary

Severity: high — Confirmed exfiltration and publication of significant business data (~900 GB) including employee PII, financial records, and proprietary project documentation from a construction contractor with exposure to critical infrastructure projects.

BlackBasta claims to have exfiltrated approximately 900 GB of company data, including HR records, accounting files, employee personal documents, and confidential project files with CAD drawings. The group has published the data.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • HR records
  • Accounting data
  • Employee personal documents
  • User credentials
  • CAD drawings
  • Project documentation
  • Confidential company records

What the group claims

Olson & Co. Steel is a premier steel contractor that provides steel fabrication, erection, and specialty construction services. The company was formed in 2002 from the consolidation of Bostrom Bergen Metal Products and Meddco Metals, and has a long history of serving the construction industry since 1960. Olson & Co. Steel has completed various specialty projects, including the Potrero Power Station A Building, Santa Clara Valley Medical Center Art Feature, Massy House, Hangar 3 Timber Repair Scaffold and Shoring Tower, Orbital Art Feature, Stanford Central Campus Process Steam System, U.C Davis Brewery, Saint Peter & Paul Church, Stanley Mosk Library & Courts, San Jose Southside Police Station, Geneva Car Enclosure (Butler), California Dairies Plant 7, California Dairies Visalia Plant, Keyes Ethanol Plant, and Pixley Ethanol. The company is a market leader in bringing technology to its detailing, fabrication, and erection processes, and strives for innovation and continuous improvement.SITE: www.olsonsteel.com Address : 1941 Davis Street, San Leandro, CA, 94577 USAALL DATA SIZE: ≈900gb 1. Company data: HR, Accounting and etc… 2. Employees, users data + personal documents 3. Projects and CAD, Confidetial documents and drawings And much more…

Sources

Source

Indexed 2 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 blackbasta

Black Basta is a highly sophisticated ransomware group that emerged in April 2022 and operates with a primary motivation of financial extortion, having rapidly established itself as one of the most prolific ransomware operations of the modern era with over 500 confirmed victims globally. The group is widely assessed by researchers including Mandiant and CISA to have likely ties to former members of the Conti ransomware syndicate following that group's dissolution in mid-2022, and operates as a private Ransomware-as-a-Service (RaaS) model with a closed affiliate structure rather than open recruitment, with suspected links to the FIN7 threat actor cluster based on observed tooling overlaps documented by SentinelOne and Microsoft. Black Basta employs a double extortion methodology, exfiltrating sensitive victim data prior to encryption and threatening publication on their Tor-based leak site "Basta News" to compound pressure on victims; initial access is predominantly achieved through phishing campaigns, purchase of stolen credentials, and exploitation of known vulnerabilities including QakBot malware distribution, with the group subsequently deploying tools such as Cobalt Strike, SystemBC, and their custom encryptor targeting both Windows and VMware ESXi environments using a ChaCha20 encryption algorithm. Per CISA and FBI joint advisory AA24-131A published in May 2024, the group has struck over 500 organizations across North America, Europe, and Australia, with high-profile victims including Ascension Health, Capita, the American Dental Association, and Rheinmetall, demonstrating a clear preference for manufacturing, business services, technology, transportation, and food production sectors across the United States, United Kingdom, Germany, Canada, and Italy. As of the time of available public reporting, Black Basta remained operationally active, though internal chat logs leaked in early 2025 revealed significant internal tensions and potential organizational fragmentation that security researchers assessed could impact the group's near-term operational cohesion. The group has been linked to 523 public disclosures across our corpus. First observed on a leak site on April 26, 2022; most recent post January 11, 2025. The operation is currently inactive.

Timeline of this disclosure

  • May 4, 2024olsonsteel.com listed by blackbastaon the group's public leak site

Other recent disclosures by blackbasta

blackbasta has been linked to 523 public victims on Darkfield. A sample of the most recent:

See the full blackbasta dossier →

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 3,796 disclosures indexed across all operators we track. Geographically, olsonsteel.com is reported in United States, a country with 3,138 ransomware disclosures in our corpus.

If your organisation is affected

A listing by blackbasta means olsonsteel.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 blackbasta'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.