Disclosure context

About Onyx

Onyx is a ransomware group that emerged in April 2022, primarily motivated by financial gain through extortion operations targeting organizations across North and South America. The group's country of origin and potential affiliations with other ransomware operations remain undetermined based on publicly available threat intelligence. Onyx has demonstrated a preference for targeting government and transportation sector entities, with their attack methodology and technical capabilities including initial access vectors, encryption methods, and data exfiltration practices not comprehensively documented in open-source intelligence reports from major cybersecurity firms or government agencies. The group has compromised 28 known victims, with the majority of their operations concentrated in the United States, Brazil, and Mexico, suggesting either a geographic targeting preference or regional access capabilities. Due to Onyx being a relatively smaller ransomware operation with limited public documentation from established threat intelligence sources like CISA, FBI, or major security research organizations, detailed information about specific notable campaigns, ransom demands, or high-profile victim organizations has not been extensively reported in public threat assessments. The current operational status of the Onyx ransomware group remains unclear based on available open-source intelligence reporting. The group has been linked to 28 public disclosures across our corpus. First observed on a leak site on April 29, 2022; most recent post January 2, 2023. The operation is currently inactive.

Timeline of this disclosure

November 21, 2022www.jaspercountysheriffoffice.com listed by Onyxon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Government sector, which has 509 disclosures indexed across all operators we track. Geographically, www.jaspercountysheriffoffice.com 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

Jasper County Sheriff's Office

listed as www.jaspercountysheriffoffice.com · Claimed by Onyx · listed 3 years ago

42m

Age

since listed · data leaked

Status timeline

Listed
Nov 21, 2022
Data leaked

At a glance

Group: Onyx
Status: Data leaked
Country: United States
Sector: Government
Listed on leak site: Nov 21, 2022

About the victim

AI dossier — public-source company profile

The Jasper County Sheriff's Office is a county law enforcement agency located in Newton, Illinois, serving Jasper County. It operates 24/7 and is responsible for maintaining public peace, enforcing laws, managing the county jail, and protecting the constitutional rights of citizens. The office is led by Sheriff Brandon Francis.

Industry: Law Enforcement & Public Safety
Address: 106 E. Morgan Street, Newton, IL 62448

Attack summary

Severity: critical — The victim is a county law enforcement agency (government/public safety sector) with data_published status. Law enforcement offices hold regulated sensitive data including PII of arrested individuals, detainee records, criminal investigation files, and staff personal information — constituting regulated/sensitive data at scale with serious public safety implications.

The Onyx ransomware group claims to have attacked the Jasper County Sheriff's Office, with the disclosure status listed as data_published. No specific details about encryption, exfiltration methods, or the nature of published data are available from the captured leak post.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Law enforcement records
Arrest reports
Jail records
Personal data of detainees and staff
Internal government communications

Sources

Victim sitejaspercountysheriffoffice.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.