Disclosure context

About osiris

Osiris is a recently emerged ransomware group first observed in December 2025, operating with apparent financial motivations based on their targeting patterns and limited known victim base of three organizations. The group's origin and affiliations remain unclear due to their recent emergence, though their targeting of victims across the United States, India, and the Philippines suggests either a broad opportunistic approach or potential connections to actors operating across these regions. Limited intelligence is available regarding Osiris's specific attack methodology, encryption techniques, or whether they employ data exfiltration tactics prior to encryption, though their focus on manufacturing and technology sectors indicates they may be targeting organizations with valuable intellectual property or operational data. No major high-profile campaigns or significant ransoms have been publicly documented for this group, likely due to their recent emergence and small victim count. Given the December 2025 first observation date, Osiris appears to be a newly active threat actor, though insufficient data exists to determine their operational tempo, capabilities, or long-term threat potential. The group has been linked to 3 public disclosures across our corpus. First observed on a leak site on December 18, 2025; most recent post March 23, 2026. The operation is currently active.

Timeline of this disclosure

January 9, 2026American Vanguard listed by osirison the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 2,458 disclosures indexed across all operators we track. Geographically, American Vanguard is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

← All victims

American Vanguard

Claimed by osiris · listed 4 months ago

Age

since listed · data leaked

Status timeline

Listed
Jan 9, 2026
Data leaked

At a glance

Group: osiris
Status: Data leaked
Country: United States
Sector: Manufacturing
Listed on leak site: Jan 9, 2026

About the victim

AI dossier — public-source company profile

American Vanguard Corporation (NYSE: AVD) is a publicly traded U.S. company headquartered in Newport Beach, California, specializing in agricultural chemicals including herbicides, insecticides, fungicides, and fumigants marketed under its AMVAC brand. Founded in 1969, the company serves global agricultural markets through research and development, strategic acquisitions, and a focus on sustainable pest control solutions. Its financial performance is closely tied to agricultural trends and regulatory dynamics.

Industry: Agricultural Chemicals & Crop Protection
Address: Newport Beach, California, United States
Founded: 1969

Attack summary

Severity: high — Data has been published (not merely listed), indicating confirmed exfiltration from a publicly traded manufacturing company. The company handles regulated chemical products and financial disclosures, and as an NYSE-listed entity, exfiltrated data likely includes sensitive financial, operational, and potentially proprietary R&D information, warranting a high severity rating.

The Osiris ransomware group claims to have attacked American Vanguard Corporation and has published data (disclosed status: data_published), indicating exfiltration of company data, though specific details on encryption or exact data categories are not enumerated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Corporate financial data
Business operational records
Potentially proprietary agricultural chemical formulations
Employee and organizational data

What the group claims

American Vanguard Corporation is a U.S.-based company specializing in agricultural chemicals, primarily focused on crop protection products like herbicides, insecticides, fungicides, and fumigants. Founded in 1969 and headquartered in Newport Beach, California, the company markets products under its AMVAC brand and other specialized labels, serving global agricultural markets. Through a combination of research and development, strategic acquisitions, and a focus on sustainable practices, American Vanguard aims to enhance crop yields while minimizing environmental impact. It invests in greener alternatives to traditional chemicals and emphasizes innovation in pest control solutions. As a publicly traded company (NYSE: AVD), its financial performance is closely tied to agricultural trends and regulatory changes within the industry.

Source

Indexed 4 months 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.