Disclosure context

About Nokoyawa

Nokoyawa is a ransomware group that emerged in December 2022, operating with primarily financial motivations and targeting organizations across multiple sectors including healthcare, non-profit, education, finance, and energy. The group has claimed at least 36 victims since its emergence, with attacks predominantly focused on the United States, Canada, United Kingdom, France, and the Philippines. While detailed technical analysis of Nokoyawa's operations remains limited in public reporting, the group appears to follow conventional ransomware tactics targeting critical infrastructure and essential services sectors. Their targeting of healthcare and educational institutions suggests they operate without the sector restrictions that some other ransomware groups have adopted. Notable campaigns include attacks across their preferred geographic regions, though specific high-profile incidents have not been extensively documented in public threat intelligence reporting from major security firms. As of current reporting, Nokoyawa appears to remain an active threat, though the group's relatively recent emergence means long-term operational patterns and potential law enforcement disruption efforts are still developing. The group has been linked to 36 public disclosures across our corpus. First observed on a leak site on December 9, 2022; most recent post August 4, 2023. The operation is currently inactive.

Timeline of this disclosure

May 23, 2023Pueblo Mechanical & Controls listed by Nokoyawaon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Construction sector, which has 415 disclosures indexed across all operators we track. Geographically, Pueblo Mechanical & Controls 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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Pueblo Mechanical & Controls

Claimed by Nokoyawa · listed 3 years ago

36m

Age

since listed · data leaked

Status timeline

Listed
May 23, 2023
Data leaked

At a glance

Group: Nokoyawa
Status: Data leaked
Country: United States
Sector: Construction
Listed on leak site: May 23, 2023

About the victim

AI dossier — public-source company profile

Pueblo Mechanical & Controls is a leading commercial HVAC, plumbing, and controls systems contractor operating across the Sun Belt and Rocky Mountain regions of the United States, headquartered in Phoenix, Arizona. Founded in 2001, the company serves commercial, industrial, K-12 education, higher education, healthcare, federal, and municipal clients. It operates as a subsidiary of Modigent, a national mechanical services platform, and has been recognized as a top mechanical contractor in Arizona.

Industry: Commercial HVAC, Plumbing & Controls Contracting
Address: Phoenix, AZ, United States
Employees: 201-500
Founded: 2001

Attack summary

Severity: high — Data has been published (disclosed status: data_published), confirming exfiltration. The company serves government, healthcare, and educational clients, meaning stolen data likely includes sensitive project, personnel, and potentially regulated client information at meaningful scale.

The Nokoyawa ransomware group claims to have attacked Pueblo Mechanical & Controls and has published data from the victim, indicating exfiltration of company data. No ransom amount was stated and no specific data size was disclosed.

high

Data the group says was taken

AI dossier — extracted from the leak post

Business records
Client/customer data
Employee information
Project and contract documents
Financial records

What the group claims

Pueblo Mechanical & Controls is a leading provider of commercial HVAC and plumbing repair, replacement, and retrofit services across the Sun Belt and Rocky Mountain regions of the US. Founded in 2001, the company primarily focuses on servicing customers in commercial, industrial, education...

Sources

Source

Indexed 3 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.