Was American Casting Company hit by ransomware?

American Casting Company was listed by the Storm 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 Storm ransomware group?

Storm 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 American Casting Company breach?

Storm published data attributed to American Casting Company. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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American Casting Company

Claimed by Storm · listed 5 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedSep 18, 2026
Data leakeddate unknown

At a glance

Group: Storm
Status: Data leaked
Country: United States
Sector: Manufacturing
Listed on leak site: Sep 18, 2026

About the victim

AI dossier — public-source company profile

American Casting Company is an ISO 9001 and AS9100 certified investment casting foundry in Hollister, California, specializing in high-performance castings for aerospace, medical, and defense sectors. The company serves clients requiring complex geometries and precision components, offering services including design consultation, NADCAP heat treating, and non-destructive testing.

Industry: Investment Casting & Aerospace Manufacturing
Address: 205 Apollo Way, Suite A, Hollister, CA 95023, United States
Employees: 51-200

Attack summary

Severity: low — The disclosed status is 'data_published' but the leak post contains only a company description with no proof files, screenshots, or specific data samples shown. No operational disruption is claimed, and no sensitive data inventory is detailed in the available post.

The Storm group claims to have conducted an attack on American Casting Company. The leak post does not specify whether data was encrypted, exfiltrated, or both, nor does it detail what data categories are at stake.

low

What the group claims

American Casting Company is an ISO 9001 and AS9100 certified investment casting foundry located in Hollister, California, specializing in premier quality investment castings for the aerospace and medical industries. The company offers a variety of castings made from super alloys and other high-performance materials, ensuring the industry's shortest lead times through advanced manufacturing processes, including 3D printing and vacuum melting. Their services include design for manufacturability, NADCAP heat treating, and non-destructive testing, catering to clients in sectors such as medical, aerospace, defense, and industrial applications. With a focus on innovation and quality, American Casting Company commits to delivering precise, durable, and strong investment castings perfect for complex geometries. The company headquarters is located in 205 Apollo Way, Suite A, Hollister, CA 95023, United States. 51-200 Employees

Sources

Source

Indexed 5 hours 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 Storm

Storm is a ransomware group first observed in August 2026, operating with an apparent financial motivation based on its targeting profile, though limited public documentation exists given its recent emergence and relatively small victim footprint. The group has claimed or been attributed to attacks against at least six known victims, with the United States representing its primary target geography. Storm has demonstrated a preference for targeting the healthcare and manufacturing sectors, alongside a broader category of other industries, suggesting an opportunistic rather than highly specialized targeting philosophy. Due to the group's recent emergence and limited victim count, comprehensive technical details regarding its initial access vectors, encryption methodology, tooling, or affiliation with known threat actor ecosystems have not yet been formally documented by CISA, the FBI, Mandiant, or other major threat intelligence publishers as of the time of this writing. No confirmed RaaS infrastructure, dark web leak site activity, or law enforcement actions against the group have been publicly attributed or reported in open sources. Given its nascent operational timeline beginning in 2026, Storm should be monitored as an emerging threat, particularly within the healthcare sector where ransomware attacks carry significant operational and patient safety implications, but analysts should treat any further characterization beyond the known victim and targeting data with caution pending additional corroborating intelligence. The group has been linked to 61 public disclosures across our corpus. First observed on a leak site on August 7, 2026; most recent post September 18, 2026. The operation is currently active.

Timeline of this disclosure

September 18, 2026American Casting Company listed by Storm on the group's public leak site

Other recent disclosures by Storm

Storm has been linked to 61 public victims on Darkfield. A sample of the most recent:

See the full Storm dossier →

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 3,696 disclosures indexed across all operators we track. Geographically, American Casting Company is reported in United States, a country with 3,167 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Storm means American Casting Company 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 Storm'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.