Disclosure context

About radiant

Based on publicly available information, Radiant is an emerging ransomware group that was first observed in October 2025, representing one of the newer threats in the ransomware landscape with a relatively small footprint of eight documented victims to date. The group appears to be financially motivated, following the typical ransomware business model of encrypting victim data and demanding payment for decryption keys. Limited intelligence suggests the group operates independently rather than as a ransomware-as-a-service operation, though insufficient data exists to definitively establish their country of origin or potential affiliations with other cybercriminal organizations. Due to the group's recent emergence and limited victim count, specific details regarding their attack methodology, initial access vectors, and technical capabilities remain largely undocumented by major security research organizations. Their targeting pattern shows a geographic focus on Western nations including the United States, Netherlands, Germany, United Kingdom, and Finland, with victim organizations spanning healthcare, transportation and logistics, agriculture and food production, and consumer services sectors. Given the group's recent emergence in late 2025, there are no documented major campaigns, high-profile attacks, or law enforcement actions against Radiant at this time. The group appears to remain active as of current reporting, though their limited operational history and small victim count suggest they are either in early operational phases or operating at a relatively small scale compared to established ransomware enterprises. The group has been linked to 8 public disclosures across our corpus. First observed on a leak site on October 12, 2025; most recent post October 29, 2025. The operation is currently inactive.

Timeline of this disclosure

October 12, 2025UK Rail Services listed by radianton the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Transportation/Logistics sector, which has 847 disclosures indexed across all operators we track. Geographically, UK Rail Services is reported in United Kingdom, a country with 902 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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UK Rail Services

Claimed by radiant · listed 7 months ago

Age

since listed · data leaked

Status timeline

Listed
Oct 12, 2025
Data leaked

At a glance

Group: radiant
Status: Data leaked
Country: United Kingdom
Sector: Transportation/Logistics
Listed on leak site: Oct 12, 2025

About the victim

AI dossier — public-source company profile

UK Rail Services appears to be a rail transportation or logistics company operating in the United Kingdom. No public site content was available to confirm the precise nature or scale of operations. The name suggests involvement in passenger or freight rail services within the UK.

Industry: Rail Transportation Services

Attack summary

Severity: high — The status is marked as data_published, indicating confirmed exfiltration and disclosure rather than a mere listing. Rail transportation is critical national infrastructure in the UK, elevating the potential impact even without granular detail on data types or volume.

The Radiant ransomware group claims to have attacked UK Rail Services and has published data, issuing a 3-day ultimatum for contact before escalating. No specific details on encryption or exfiltration volume are disclosed in the post.

high

What the group claims

Unknown. You will be contacted shortly. 3 Days for contact or else we will begin our process.

Source

Indexed 7 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.