Was EMS1R hit by ransomware?

EMS1R was listed by the direwolf 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 direwolf ransomware group?

direwolf 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 EMS1R breach?

direwolf published data attributed to EMS1R. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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EMS1R

Claimed by Direwolf · listed 5 days ago

Age

since listed · data leaked

Status timeline

ListedSep 8, 2026
Data leakeddate unknown

At a glance

Group: Direwolf
Status: Data leaked
Country: United States
Listed on leak site: Sep 8, 2026

About the victim

AI dossier — public-source company profile

EMS1R provides a unified AI-powered platform for emergency medical services, including computer-aided dispatch (CAD), mobile data terminals, crew scheduling, fleet management, ePCR (electronic patient care records), and business intelligence. The company serves EMS organizations across North America and exhibits at major industry conferences.

Industry: Emergency Medical Services (EMS) Software & Dispatch Systems
Employees: 2037

Attack summary

Severity: critical — Confirmed exfiltration of regulated healthcare data at massive scale: 252,000+ patient records with full PHI including partial SSNs, insurance details, and GPS locations; 2,000+ employee records with payroll and access credentials; 473,000+ ePCR documents; and 7.8M service logs. This represents a significant breach of HIPAA-protected information affecting both patients and staff.

The direwolf group claims to have exfiltrated the complete production databases (9 databases, ~110 GB) from EMS1R's ambulance dispatch and patient management system. The disclosure includes patient protected health information (PHI), employee records, insurance data, and operational logs totaling over 252,000 patient records and nearly 7.8 million service logs.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient PHI (full name, DOB, address, phone, email, partial SSN, GPS locations)
Insurance and medical authorization data
Employee HR records (DOB, address, emergency contacts, payroll, access card numbers)
Electronic patient care records (ePCR) - 473,733 files
Service logs and dispatch records (7.8M entries)
Staff details (2,037 staff records)
User accounts with authentication credentials (2,605 users)
Chat messages (125,744 records)
Billing and service documentation

What the group claims

Corporate Wellness Services

The leak post

captured from the group's site

```
{"article":{"id":129,"title":"EMS1R","content":"\u003ch3\u003eEMS Production Database – Full Inventory \u0026amp; Sensitivity Mapping\u003c/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eItem\u003c/th\u003e\n\u003cth\u003eDetails\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRepository\u003c/strong\u003e\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003eEMS1R-Production\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c/strong\u003e\u003c/td\u003e\n\u003ctd\u003eAmbulance dispatch system comprising 9 production databases: EMS1R (main dispatch), EMS1R_DW (data warehouse), metabase (BI),, users (auth/chat), jobrunr (queues), portals (SDB tables), flowambulance_staff (staff portal), riverJobs (scheduling).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKey Tables \u0026amp; Row Counts\u003c/strong\u003e\u003c/td\u003e\n\u003ctd\u003e• \u003ccode\u003eFLOWAMBULANCE_PATIENT_SDB\u003c/code\u003e – 252,359 \u003cbr\u003e• \u003ccode\u003eFLOWAMBULANCE_SERVICE_LOG_SDB\u003c/code\u003e – 7,816,9…

Sources

Victim siteems1r.com
Leak posthttp://direwolfcdkv5whaz2spehizdg22jsuf5aeje4asmetpbt6ri4jnd4qd.onion/api/public/articles/129

Source

Indexed 5 days 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 direwolf

Direwolf is a ransomware group that emerged in May 2025 with primarily financial motivations, having targeted 71 known victims across multiple sectors and geographic regions. The group's origin and potential affiliations remain undocumented in public threat intelligence reports, with no confirmed information regarding whether they operate as a Ransomware-as-a-Service model or as an independent entity. Their attack methodology and technical capabilities have not been extensively documented by major cybersecurity firms or government agencies, though their targeting patterns indicate a focus on manufacturing, technology, healthcare, and transportation/logistics sectors across Malaysia, the United States, Thailand, Singapore, and Taiwan. No major high-profile campaigns or significant ransomware demands have been publicly attributed to this group by CISA, FBI, or established security researchers such as Mandiant. Given the group's recent emergence and limited public documentation, their current operational status and long-term threat posture remain unclear, requiring continued monitoring by the cybersecurity community to establish a more comprehensive threat profile. The group has been linked to 138 public disclosures across our corpus. First observed on a leak site on May 27, 2025; most recent post September 11, 2026. The operation is currently active.

Also tracked as: DIRE WOLF.

Timeline of this disclosure

September 8, 2026EMS1R listed by direwolf on the group's public leak site

Sector and geography

Geographically, EMS1R is reported in United States, a country with 3,165 ransomware disclosures in our corpus.

If your organisation is affected

A listing by direwolf means EMS1R 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 direwolf'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.