Was Cozen O'Connor hit by ransomware?

Cozen O'Connor 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 Cozen O'Connor breach?

SilentRansomGroup published data attributed to Cozen O'Connor. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Cozen O'Connor

Claimed by SilentRansomGroup · listed 5 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedSep 22, 2026
Data leakeddate unknown

At a glance

Group: SilentRansomGroup
Status: Data leaked
Country: United States
Sector: Professional Services
Listed on leak site: Sep 22, 2026

About the victim

AI dossier — public-source company profile

Cozen O'Connor is a full-service law firm headquartered in Philadelphia, Pennsylvania, founded in 1970. The firm provides counsel across multiple practice areas including litigation, corporate law, insurance, real estate, labor and employment, cybersecurity, and government relations, serving clients across the United States and internationally.

Industry: Legal Services
Address: Philadelphia, Pennsylvania, US
Founded: 1970

Attack summary

Severity: medium — Data has been published by the threat actor (disclosed_status: data_published), indicating confirmed exfiltration. However, no specific inventory of sensitive data types is detailed in the leak post, and no proof files or screenshots are referenced, preventing a higher severity assessment.

SilentRansomGroup claims to have targeted Cozen O'Connor and published data. No specific details are provided in the leak post regarding what data was exfiltrated or the nature of the attack (encryption, exfiltration, or both).

medium

Original description

AI-summarised, not from the leak post

Cozen O'Connor is an American full-service law firm headquartered in Philadelphia, Pennsylvania. Founded in 1970, it operates in the legal services industry, providing counsel across practice areas including litigation, corporate law, insurance, real estate, labor and employment, cybersecurity, and government relations. The firm serves clients across the United States and internationally, with offices throughout the U.S. and abroad.

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.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

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 153 public disclosures across our corpus. First observed on a leak site on May 6, 2025; most recent post September 22, 2026. The operation is currently active.

Also tracked as: Luna Moth, Silent Ransom, TG2729.

Timeline of this disclosure

September 22, 2026Cozen O'Connor listed by SilentRansomGroup on the group's public leak site

Other recent disclosures by SilentRansomGroup

SilentRansomGroup has been linked to 153 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, Cozen O'Connor is reported in United States, a country with 3,167 ransomware disclosures in our corpus.

If your organisation is affected

A listing by SilentRansomGroup means Cozen O'Connor 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.