Was YIEH UNITED STEEL CORP hit by ransomware?

YIEH UNITED STEEL CORP was listed by the direwolf ransomware operation (Taiwan), 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 YIEH UNITED STEEL CORP breach?

direwolf published data attributed to YIEH UNITED STEEL CORP. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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YIEH UNITED STEEL CORP

Claimed by Direwolf · listed 1 year ago

13m

Age

since listed · data leaked

Status timeline

ListedJun 4, 2025
Data leakeddate unknown

At a glance

Group: Direwolf
Status: Data leaked
Country: Taiwan
Sector: Manufacturing
Listed on leak site: Jun 4, 2025

About the victim

AI dossier — public-source company profile

Yieh United Steel Corp is a steel manufacturing company operating in Taiwan. The company operates in the minerals and metal production sector, serving industrial markets.

Industry: Steel Manufacturing & Metal Production

Attack summary

Severity: medium — Data has been published (confirmed exfiltration), but no specific data types, scale, or proof inventory is detailed in the available post excerpt. Manufacturing company data is moderately sensitive but lacks confirmation of regulated/PII-at-scale exposure.

The direwolf group claims to have compromised Yieh United Steel Corp and published exfiltrated data. Specific details on the scope of encryption or data types are not provided in the available post excerpt.

medium

What the group claims

Yieh United Steel Corp is a company that operates in the Minerals & Mining industry

Sources

Leak posthttp://direwolfcdkv5whaz2spehizdg22jsuf5aeje4asmetpbt6ri4jnd4qd.onion/articles/yusco.com.tw.html

Source

Indexed 1 year 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 75 public disclosures across our corpus. First observed on a leak site on May 27, 2025; most recent post June 12, 2026. The operation is currently active.

Also tracked as: DIRE WOLF.

Timeline of this disclosure

June 4, 2025YIEH UNITED STEEL CORP listed by direwolfon the group's public leak site

Other recent disclosures by direwolf

direwolf has been linked to 75 public victims on Darkfield. A sample of the most recent:

See the full direwolf dossier →

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 3,681 disclosures indexed across all operators we track. Geographically, YIEH UNITED STEEL CORP is reported in Taiwan, a country with 55 ransomware disclosures in our corpus.

If your organisation is affected

A listing by direwolf means YIEH UNITED STEEL CORP 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.
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.