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 71 public disclosures across our corpus. First observed on a leak site on May 27, 2025; most recent post January 13, 2026. The operation is currently active.

Timeline of this disclosure

January 13, 2026Tepco-Group listed by direwolfon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Energy sector, which has 374 disclosures indexed across all operators we track. Geographically, Tepco-Group is reported in Japan, a country with 108 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

Tepco-Group

Claimed by direwolf · listed 4 months ago

Age

since listed · data leaked

Status timeline

Listed
Jan 13, 2026
Data leaked

At a glance

Group: direwolf
Status: Data leaked
Country: Japan
Sector: Energy
Listed on leak site: Jan 13, 2026

About the victim

AI dossier — public-source company profile

TEPCO GROUP (tepco-group.com) presents itself as a company operating in the electronics and energy sectors, based in Japan. The public site excerpt provides limited substantive content beyond styling, but the group's leak post categorises the victim under 'Electronics'. The company appears to be a Japanese conglomerate or trading group with interests spanning energy and electronics.

Industry: Electronics & Energy Distribution

Attack summary

Severity: high — Data has been confirmed as published by the threat actor against a Japanese energy/electronics sector company, indicating successful exfiltration. The energy sector classification elevates concern due to potential critical infrastructure relevance, though the specific nature and volume of data is unconfirmed.

The direwolf ransomware group claims to have attacked Tepco-Group and has published data (disclosed status: data_published), indicating exfiltration of company data. No specific ransom amount or data volume was stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Electronics-related business data
Internal company files

What the group claims

Electronics

Sources

Victim sitetepco-group.com
Leak posthttp://direwolfcdkv5whaz2spehizdg22jsuf5aeje4asmetpbt6ri4jnd4qd.onion/api/public/articles/64

Source

Indexed 4 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.