Was Marshall Dennehey hit by ransomware?

Marshall Dennehey 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 Marshall Dennehey breach?

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

Ransomware victim disclosure

← All victims

Marshall Dennehey

Claimed by SilentRansomGroup · listed 2 months ago

Age

since listed · data leaked

Status timeline

ListedMay 12, 2026
Data leakeddate unknown

At a glance

Group: SilentRansomGroup
Status: Data leaked
Country: United States
Sector: Business Services
Listed on leak site: May 12, 2026

About the victim

AI dossier — public-source company profile

Marshall Dennehey is a large US defense litigation law firm founded in 1962 and headquartered in Philadelphia, Pennsylvania. The firm specializes in civil defense representation across multiple practice areas including insurance defense, professional liability, and workers' compensation. It operates numerous offices across the eastern United States and employs hundreds of attorneys and staff.

Industry: Legal Services & Defense Litigation
Address: 2000 Market Street, Philadelphia, PA 19103, United States
Employees: 500-1000
Founded: 1962

Attack summary

Severity: critical — Marshall Dennehey is a major law firm whose data inherently contains attorney-client privileged communications, PII of clients and staff at scale, and sensitive litigation records. The disclosed status is 'data_published', confirming actual exfiltration and public release of highly sensitive regulated data, and the failed $100,000 negotiation confirms the threat actor possessed genuinely sensitive material.

SilentRansomGroup claims to have exfiltrated data from Marshall Dennehey and published the data after the firm allegedly offered $100,000 to prevent publication, implying a failed ransom negotiation resulting in full data release.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Client legal files
Attorney-client privileged communications
Case records and litigation documents
Employee personal information
Financial records
Internal communications

What the group claims

They offered $100,000 to keep the data from being published. Founded in 1962 and headquartered in Phil…

Source

Indexed 2 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.

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 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

May 12, 2026Marshall Dennehey 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, Marshall Dennehey is reported in United States, a country with 3,115 ransomware disclosures in our corpus.

If your organisation is affected

A listing by SilentRansomGroup means Marshall Dennehey 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.