Disclosure context

About Killsecurity

Killsecurity is a relatively new ransomware group that emerged in March 2024, operating with apparent financial motivations and demonstrating rapid expansion in their victim targeting. The group's origin and affiliations remain unclear due to limited public documentation from major threat intelligence sources, though their global targeting pattern suggests a sophisticated operation. Based on available victim data, Killsecurity has compromised 276 organizations primarily across the United States, India, United Kingdom, Brazil, and Belgium, with a particular focus on healthcare, technology, business services, and financial sectors. The group's attack methodology, encryption techniques, and specific tools remain undocumented in public threat intelligence reports from established security firms. Notable campaigns and high-profile victims have not been extensively documented by major cybersecurity organizations or law enforcement agencies, likely due to the group's recent emergence. Killsecurity appears to remain active as of current reporting, though comprehensive analysis of their operations is limited by the lack of detailed technical documentation from reputable threat intelligence sources. The group has been linked to 277 public disclosures across our corpus. First observed on a leak site on March 21, 2024; most recent post May 15, 2026. The operation is currently active.

Timeline of this disclosure

February 4, 2026brooklyn group listed by Killsecurityon 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, brooklyn group 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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brooklyn group

Claimed by Killsecurity · listed 4 months ago

Age

since listed · data leaked

Status timeline

Listed
Feb 4, 2026
Data leaked

At a glance

Group: Killsecurity
Status: Data leaked
Country: United States
Sector: Not Found
Listed on leak site: Feb 4, 2026

About the victim

AI dossier — public-source company profile

Brooklyn Group operates under the domain brooklyngroup.com and is based in the United States. No public site content was available to further describe their operations, products, or scale. The company's specific industry and activities remain unverified from available sources.

Attack summary

Severity: low — The leak post contains no proof files, no ransom demand, no stated data volume, and no description of exfiltrated or encrypted data. Only a bare listing/announcement with a single disclosure slot is present.

Killsecurity claims to have compromised Brooklyn Group and has published the disclosure at a 0/1 stage, suggesting partial or initial data release. No ransom amount or specific data volume has been stated.

low

What the group claims

Price ??? Disclosures 0/1

Sources

Victim sitebrooklyngroup.com

Source

Indexed 4 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.