Disclosure context

About Interlock

Interlock is a recently emerged ransomware group that began operations in October 2024, primarily motivated by financial gain through extortion activities targeting organizations across multiple sectors. The group's country of origin and potential affiliations remain unclear given their recent emergence, with insufficient public documentation to determine whether they operate as an independent entity or under a Ransomware-as-a-Service model. Limited public information exists regarding their specific attack methodologies, initial access vectors, or encryption techniques, as major cybersecurity firms and law enforcement agencies have not yet published comprehensive technical analyses of their operations. Since beginning operations, Interlock has reportedly compromised approximately 100 victims, with their targeting primarily focused on organizations in English-speaking countries including the United States, Canada, United Kingdom, and Australia, as well as Italy, while demonstrating a preference for attacking education, manufacturing, healthcare, and public sector entities. The group remains active as of late 2024, though comprehensive threat intelligence profiles from established security research organizations have not yet been published due to the group's recent emergence in the threat landscape. The group has been linked to 109 public disclosures across our corpus. First observed on a leak site on October 13, 2024; most recent post May 11, 2026. The operation is currently active.

Timeline of this disclosure

December 22, 2025Swartz Campbell listed by Interlockon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, Swartz Campbell 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

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Swartz Campbell

Claimed by Interlock · listed 5 months ago

Age

since listed · data leaked

Status timeline

Listed
Dec 22, 2025
Data leaked

At a glance

Group: Interlock
Status: Data leaked
Country: United States
Sector: Not Found
Listed on leak site: Dec 22, 2025

About the victim

AI dossier — public-source company profile

Swartz Campbell LLC is a multi-location law firm headquartered in Philadelphia, Pennsylvania, with offices across the East Coast. Founded in 1921, the firm specializes in areas including class action litigation, employment law, medical malpractice, and divorce. It operates as a full-service civil defense and litigation practice serving clients across multiple states.

Industry: Legal Services (Law Firm)
Address: Philadelphia, Pennsylvania, United States
Founded: 1921

Attack summary

Severity: critical — A law firm handling medical malpractice, employment, class action, and divorce cases holds highly sensitive attorney-client privileged communications and PII at scale. Data publication by the threat actor confirms exfiltration of regulated and sensitive personal and legal data affecting potentially many clients.

The Interlock ransomware group claims to have exfiltrated data from Swartz Campbell LLC and has published the data. No ransom amount was stated and no data size was specified, but the disclosed status indicates data has been published.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Client legal files
Case records
Personally identifiable information (PII)
Medical malpractice case documents
Employment litigation records
Divorce and family law records
Attorney-client privileged communications

What the group claims

Swartz Campbell LLC is a law firm with multiple locations across the East Coast specializing in areas including class action, employment, medical malpractice, and divorce. The law firm was founded in 1921 and is headquartered in Philadelphia, Pennsylvania.

Sources

Victim sitehttps;www.swartzcampbell.com
Leak posthttp://zsjvoqymwx5gdwntsrrk3pvnkfyoxy3knhoxitpdaobxznwc5iwcj4id.onion/index.php?p=

Source

Indexed 5 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.