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Herman & Chamow

Claimed by Worldleaks · listed 8 months ago

8m
Age
since listed · data leaked

Status timeline

  1. ListedNov 14, 2025
  2. Data leakeddate unknown

At a glance

Group
Worldleaks
Status
Data leaked
Country
United States
Listed on leak site
Nov 14, 2025

About the victim

AI dossier — public-source company profile

Herman & Chamow is a certified public accounting firm based in California, operating under the domain rhccpa.com. The firm provides auditing, accounting, and tax services to both private clients and business entities, assisting them in financial decision-making and goal achievement.

Industry
Certified Public Accounting & Tax Services
Address
California, United States

Attack summary

Severity: critical — Herman & Chamow is a CPA firm whose data holdings almost certainly include highly regulated financial PII, tax records, and audit documents for both individuals and businesses — categories of sensitive regulated data. The status is 'data_published', indicating confirmed exfiltration and public release.

The worldleaks group has disclosed data allegedly exfiltrated from Herman & Chamow, with the post status indicating data has been published; no ransom amount or specific data volume was stated.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Client financial records
  • Tax documents
  • Audit files
  • Business entity records
  • Private client personal financial information

Original description

AI-summarised, not from the leak post

"Herman & Chamow" is a certified public accounting firm based in California. Its primary services revolve around auditing, accounting, and tax-related matters. The firm provides assistance to private clients and business entities on making sound financial decisions, helping them achieve their financial goals. The company is committed to maintaining the highest standards of integrity and professionalism.

Sources

Source

Indexed 8 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 worldleaks

Based on the limited available data, worldleaks is a recently emerged ransomware group that was first observed in May 2025 and appears to be primarily financially motivated, having claimed 134 victims in a relatively short timeframe since its emergence. The group's origin and organizational structure remain unclear, with no publicly documented information from major cybersecurity firms or law enforcement agencies regarding their country of origin, potential affiliations, or operational model. Their targeting patterns indicate a focus on English-speaking countries, particularly the United States, United Kingdom, and Canada, with additional activity observed in Germany and Japan, while their sector targeting shows a preference for healthcare, technology, manufacturing, and consumer services organizations. Due to the group's recent emergence and limited public documentation by established threat intelligence sources, specific details about their attack methodologies, encryption techniques, extortion tactics, and notable campaigns have not yet been comprehensively analyzed or reported by organizations such as CISA, FBI, or major cybersecurity research firms. The group appears to remain active as of the most recent observations, though comprehensive threat intelligence profiling awaits further analysis and documentation by established cybersecurity authorities. The group has been linked to 173 public disclosures across our corpus. First observed on a leak site on May 18, 2025; most recent post July 2, 2026. The operation is currently active.

Timeline of this disclosure

  • November 14, 2025Herman & Chamow listed by worldleakson the group's public leak site

Other recent disclosures by worldleaks

worldleaks has been linked to 173 public victims on Darkfield. A sample of the most recent:

See the full worldleaks dossier →

Sector and geography

Geographically, Herman & Chamow is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by worldleaks means Herman & Chamow 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 worldleaks'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.