Was Katten Muchin Rosenman hit by ransomware?

Katten Muchin Rosenman 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 Katten Muchin Rosenman breach?

SilentRansomGroup published data attributed to Katten Muchin Rosenman. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Katten Muchin Rosenman

Claimed by SilentRansomGroup · listed 1 day ago

Age

since listed · data leaked

Status timeline

ListedSep 3, 2026
Data leakeddate unknown

At a glance

Group: SilentRansomGroup
Status: Data leaked
Country: United States
Sector: Professional Services
Listed on leak site: Sep 3, 2026

About the victim

AI dossier — public-source company profile

Katten Muchin Rosenman is a full-service law firm operating across multiple offices in major U.S. cities and internationally. The firm provides legal services in corporate law, litigation, financial markets, real estate, intellectual property, and regulatory compliance, serving clients across finance, entertainment, and healthcare sectors.

Industry: Legal Services

Attack summary

Severity: medium — Law firms typically hold sensitive client data including legal documents, financial information, and potentially privileged communications. However, the leak post provides no concrete evidence of data exfiltration, proof files, or specifics about what was accessed, limiting confidence in the actual scope of compromise.

SilentRansomGroup claims to have conducted an attack on Katten Muchin Rosenman. The leak post provides no specifics on the nature of the attack (encryption, exfiltration, or both) or the data allegedly compromised.

medium

Original description

AI-summarised, not from the leak post

Katten Muchin Rosenman is a full-service law firm headquartered in the United States. Operating across multiple offices in major American cities and internationally, the firm provides legal services in areas including corporate law, litigation, financial markets, real estate, intellectual property, and regulatory compliance. It serves clients across industries such as finance, entertainment, and healthcare, and is recognized as a prominent firm within the U.S. legal sector.

Source

Indexed 1 day 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 148 public disclosures across our corpus. First observed on a leak site on May 6, 2025; most recent post September 4, 2026. The operation is currently active.

Timeline of this disclosure

September 3, 2026Katten Muchin Rosenman listed by SilentRansomGroupon the group's public leak site

Other recent disclosures by SilentRansomGroup

SilentRansomGroup has been linked to 148 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 Professional Services sector, which has 17 disclosures indexed across all operators we track. Geographically, Katten Muchin Rosenman is reported in United States, a country with 3,165 ransomware disclosures in our corpus.

If your organisation is affected

A listing by SilentRansomGroup means Katten Muchin Rosenman 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.