Was Reliance Heating hit by ransomware?

Reliance Heating was listed by the blacklock 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 blacklock ransomware group?

blacklock 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 Reliance Heating breach?

blacklock published data attributed to Reliance Heating. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Reliance Heating and Air

listed as Reliance Heating · Claimed by Blacklock · listed 1 year ago

$21.7M

Ransom

demanded

13m

Age

since listed · data leaked

Status timeline

ListedMay 25, 2025
Data leakeddate unknown

At a glance

Group: Blacklock
Status: Data leaked
Country: United States
Sector: Consumer Services
Listed on leak site: May 25, 2025
Ransom demanded: $21.7M
Estimated revenue: $21.7M

About the victim

AI dossier — public-source company profile

Reliance Heating and Air is a regional HVAC service provider specializing in repair, maintenance, and replacement of heating, cooling, air conditioning, heat pumps, ductless mini-splits, refrigeration, and furnaces. They serve residential and commercial clients across the Metro Atlanta and Nashville areas.

Industry: HVAC Repair & Maintenance Services
Address: Cumming, GA; Conyers, GA; Nashville, TN

Attack summary

Severity: medium — Data has been published by the threat actor, confirming exfiltration. However, no specific sensitive data categories (PII, financial records, health data) are explicitly detailed in the post. HVAC service companies typically hold customer contact information and service histories, which represent moderate sensitivity.

BlackLock claims to have exfiltrated data from Reliance Heating and Air. The group has published data on their leak site, indicating successful data exfiltration during the attack.

medium

Data the group says was taken

AI dossier — extracted from the leak post

business records
customer data
operational files

What the group claims

Reliance Heating and Air is a repair, service, replacement, and maintenance company specializing in heating, cooling, air conditioning, heat pumps, ductless mini-splits, refrigeration, and furnaces. They serve residential and commercial clients in the Metro Atlanta and Nashville areas. Revenue: $21.7 Million

Sources

Source

Indexed 1 year 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 blacklock

Based on the limited publicly available information, Blacklock is an emerging ransomware group first observed in May 2025, operating with apparent financial motivations targeting organizations across multiple countries and sectors. The group's origin and potential affiliations remain unclear from documented sources, and there is insufficient public reporting to determine whether they operate as a Ransomware-as-a-Service model or as an independent entity. With 64 documented victims since their emergence, Blacklock has demonstrated a broad targeting approach across the United States, Canada, Spain, India, and the United Kingdom, with particular focus on technology, construction, manufacturing, and consumer services sectors, though their attack methodology, initial access vectors, and encryption tactics have not been extensively documented by major security research organizations. Due to the group's recent emergence and limited public reporting from established threat intelligence sources, notable campaigns and specific technical details of their operations remain largely undocumented in publicly available security research. As of current reporting, the group appears to remain active given their recent emergence date, though comprehensive analysis of their operational status requires additional documentation from established cybersecurity authorities. The group has been linked to 64 public disclosures across our corpus. First observed on a leak site on May 16, 2025; most recent post July 2, 2025. The operation is currently inactive.

Timeline of this disclosure

May 25, 2025Reliance Heating listed by blacklockon the group's public leak site

Ransom demanded: $21.7M

Other recent disclosures by blacklock

blacklock has been linked to 64 public victims on Darkfield. A sample of the most recent:

See the full blacklock dossier →

Sector and geography

This disclosure adds to ransomware activity in the Consumer Services sector, which has 829 disclosures indexed across all operators we track. Geographically, Reliance Heating is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by blacklock means Reliance Heating 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 blacklock'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.