Was Pennvet.com hit by ransomware?

Pennvet.com was listed by the Cloak 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 Cloak ransomware group?

Cloak 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 Pennvet.com breach?

Cloak published data attributed to Pennvet.com. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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PennVet

listed as Pennvet.com · Claimed by Cloak · listed 2 years ago

21m

Age

since listed · data leaked

Status timeline

ListedSep 25, 2024
Data leakeddate unknown

At a glance

Group: Cloak
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Sep 25, 2024

About the victim

AI dossier — public-source company profile

PennVet is a veterinary medical service or clinic operating under the pennvet.com domain in the United States. Based on the domain and sector classification, it likely provides animal medical care services.

Industry: Veterinary Medicine & Animal Healthcare

Attack summary

Severity: medium — Data has been published by the threat actor (disclosed status: data_published), indicating confirmed exfiltration. However, no specific data inventory, proof files, or sensitive data categories are documented in the leak post. Veterinary records may contain PII linked to pet owners, but scale and sensitivity cannot be confirmed.

Cloak claims to have compromised PennVet and published data. The specific nature of the attack (encryption, exfiltration, or both) and data categories are not detailed in the available leak post.

medium

What the group claims

Country: USA

Sources

Victim sitePennvet.com

Source

Indexed 2 years 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 Cloak

Cloak is a relatively new ransomware group that emerged in August 2023, operating with primarily financial motivations and demonstrating a broad international targeting scope with 162 documented victims across multiple sectors. The group's origin and specific affiliations remain undocumented in public threat intelligence reporting, though their operational patterns suggest they may operate independently rather than as part of a larger ransomware-as-a-service ecosystem. Limited public documentation exists regarding their specific attack methodologies, encryption techniques, or data exfiltration practices, though their targeting patterns indicate sophisticated capabilities to compromise organizations across diverse sectors including business services, technology, healthcare, and manufacturing. The group has demonstrated a preference for targeting victims in English-speaking countries and Western Europe, with the United States, Germany, United Kingdom, Canada, and Italy representing their primary geographic focus areas. Cloak appears to remain active as of current reporting, though the relative scarcity of detailed public analysis from major threat intelligence firms suggests either operational security effectiveness or a lower profile compared to more established ransomware operations. The group has been linked to 166 public disclosures across our corpus. First observed on a leak site on August 24, 2023; most recent post June 18, 2026. The operation is currently active.

Timeline of this disclosure

September 25, 2024Pennvet.com listed by Cloakon the group's public leak site

Other recent disclosures by Cloak

Cloak has been linked to 166 public victims on Darkfield. A sample of the most recent:

See the full Cloak dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,600 disclosures indexed across all operators we track. Geographically, Pennvet.com is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Cloak means Pennvet.com 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 Cloak'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.