Was Jones Day hit by ransomware?

Jones Day was listed by the SilentRansomGroup 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 SilentRansomGroup ransomware group?

SilentRansomGroup 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 Jones Day breach?

SilentRansomGroup published data attributed to Jones Day. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Jones Day

Claimed by SilentRansomGroup · listed 4 months ago

Age

since listed · data leaked

Status timeline

ListedMar 30, 2026
Data leakeddate unknown

At a glance

Group: SilentRansomGroup
Status: Data leaked
Country: United States
Sector: Business Services
Listed on leak site: Mar 30, 2026

About the victim

AI dossier — public-source company profile

Jones Day is a global law firm founded in 1893 and headquartered in Cleveland, Ohio. It is one of the largest law firms in the world, with offices across multiple continents serving corporate, governmental, and individual clients across a wide range of practice areas. The firm handles matters including litigation, mergers and acquisitions, regulatory compliance, and international arbitration.

Industry: Legal Services
Address: 901 Lakeside Avenue, Cleveland, Ohio 44114, United States
Employees: 10000+
Founded: 1893

Attack summary

Severity: critical — Jones Day is a major global law firm whose data would almost certainly include attorney-client privileged communications, sensitive client PII, financial records, and potentially government or regulatory matter files. Data has been confirmed as published, meaning regulated and highly sensitive information from potentially thousands of clients is at risk of public exposure.

SilentRansomGroup claims to have attacked Jones Day and has published data, suggesting exfiltration of firm and potentially client-related information. The disclosed status indicates data has been published, though the specific volume and ransom demand are not stated in the post.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Legal documents
Client records
Confidential communications
Employee records
Financial records

What the group claims

Jones Day founded in 1893 and headquartered in Cleveland Ohio, is a global law firm with locations acr…

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.

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Disclosure context

About SilentRansomGroup

Based on the limited available information, SilentRansomGroup is a relatively new ransomware operation that first emerged in May 2025, appearing to be financially motivated given their targeting patterns across multiple high-value sectors. The group's origin and affiliations remain unclear due to their recent emergence, though their diverse geographic targeting including the United States, Germany, Canada, and Russia suggests either a sophisticated operation or potential ransomware-as-a-service model. Their attack methodology and specific technical capabilities have not been extensively documented by major security researchers, though their targeting of business services, financial services, hospitality, and manufacturing sectors indicates they likely focus on organizations with both valuable data and ability to pay significant ransoms. With 93 known victims across multiple countries and sectors in a relatively short timeframe since May 2025, SilentRansomGroup has demonstrated notable activity levels, though specific high-profile campaigns or ransom amounts have not been publicly disclosed by CISA, FBI, or major threat intelligence firms. The group appears to remain active as of current reporting periods, though comprehensive technical analysis and attribution efforts by established security researchers are still developing given their recent emergence in the threat landscape. The group has been linked to 120 public disclosures across our corpus. First observed on a leak site on May 6, 2025; most recent post June 17, 2026. The operation is currently active.

Timeline of this disclosure

March 30, 2026Jones Day listed by SilentRansomGroupon the group's public leak site

Other recent disclosures by SilentRansomGroup

SilentRansomGroup has been linked to 120 public victims on Darkfield. A sample of the most recent:

See the full SilentRansomGroup 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, Jones Day is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by SilentRansomGroup means Jones Day 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 SilentRansomGroup'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.