Disclosure context

About nightspire

Nightspire is a ransomware group that first emerged in March 2025 and appears to be primarily financially motivated, having targeted over 215 victims in a relatively short operational timeframe. The group's origin and affiliations remain unclear due to limited public documentation from major cybersecurity organizations, though their targeting patterns suggest a broad opportunistic approach rather than nation-state backing. Based on available victim data, Nightspire appears to employ common ransomware attack vectors targeting organizations across multiple sectors, with a particular focus on manufacturing, technology, healthcare, and construction industries, while demonstrating a geographic preference for victims in the United States, India, Taiwan, France, and Hong Kong. The group's rapid victim acquisition rate since their March 2025 emergence suggests an active and potentially effective operational capability, though specific technical details about their attack methodology, encryption techniques, or extortion tactics have not been publicly documented by major threat intelligence firms. Given the recent emergence of this group and limited public reporting from established cybersecurity organizations like CISA, FBI, or Mandiant, Nightspire remains an active threat with insufficient public documentation to fully assess their operational sophistication or organizational structure. The group has been linked to 265 public disclosures across our corpus. First observed on a leak site on March 12, 2025; most recent post May 18, 2026. The operation is currently active.

Timeline of this disclosure

April 3, 2026Siena Construction listed by nightspireon 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, Siena Construction is reported in US, a country with 2,713 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

← All victims

Siena Construction

Claimed by nightspire · listed 2 months ago

47d

Age

since listed · data leaked

Status timeline

Listed
Apr 3, 2026
Data leaked

At a glance

Group: nightspire
Status: Data leaked
Country: US
Sector: Construction
Listed on leak site: Apr 3, 2026

About the victim

AI dossier — public-source company profile

Siena Construction is a US-based construction company. Based on the data categories exposed, the firm manages construction projects, maintains supplier relationships, and handles employee and financial records typical of a general contractor or specialty construction firm. No public website content was available to further characterize their scale or geographic focus.

Industry: Construction & Contracting

Attack summary

Severity: high — Data is confirmed published (not merely threatened), and the inventory includes employee PII, financial records, and sensitive bid/project documents that represent significant business and potentially regulated personal data exposure.

Nightspire claims to have exfiltrated data from Siena Construction and has published the data, with categories including project records, employee information, finance records, technical data, supplier information, and bid documents.

high

Data the group says was taken

AI dossier — extracted from the leak post

QBOOK data
Project records
Employee information
Finance records
Technical data
Supplier information
Bid documents

What the group claims

- QBOOK Data- Project Records- Employee Information- Finance Records- Technical Data- Suppliers Information- Bid Documents

Source

Indexed 2 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.