Was Delek US hit by ransomware?

Delek US was listed by the HELIX 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 HELIX ransomware group?

HELIX 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 Delek US breach?

HELIX published data attributed to Delek US. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Delek US

Claimed by Helix · listed 2 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedAug 19, 2026
Data leakeddate unknown

At a glance

Group: Helix
Status: Data leaked
Country: United States
Sector: Energy & Utilities
Listed on leak site: Aug 19, 2026

About the victim

AI dossier — public-source company profile

Delek US is an energy and utilities company operating multiple refineries and capital projects across the United States, including facilities in Tyler and Big Spring.

Industry: Energy & Utilities

Attack summary

Severity: high — Confirmed exfiltration of significant business data from critical infrastructure (refinery operations) including executive, financial, and operational documents. The scale (1.95 TB) and sensitivity layering (T3–T4 containing 733 GB of high/most-sensitive material) indicate substantial operational and strategic risk.

Helix claims to have exfiltrated internal data from Delek US, organizing stolen files into four sensitivity tiers (T1–T4) totaling approximately 1.95 TB across multiple business units. The post advertises staged, time-locked releases of SharePoint libraries containing operational, financial, and strategic documents.

high

Data the group says was taken

AI dossier — extracted from the leak post

SharePoint libraries
Economics and planning documents
Refinery turnaround plans
Executive capital reviews
Capital project files
Financial records

What the group claims

Delek US is live. T1 unlocks in 12 hours, then 24 hours per remaining tier.

The leak post

captured from the group's site

Stage 01 · Delek US
Time remaining until this package release unlocks
## Delek US · Sensitivity layers
SharePoint libraries · T1 (least) → T4 (most). Stage packages unlock when each timer hits zero.
T1 Least → T2 Low → T3 High → T4 Most. 
T1 · 3,982 files · 3.26 GB
Least sensitivity · locked until release 
2 sites in this release
T2 · 241,855 files · 223.53 GB
Low sensitivity · locked until release 
13 sites in this release


T3 · 457,008 files · 716.41 GB
High sensitivity · locked until release 
40 sites in this release
  * Delekus / Economics And Planning
  * TylerRefineryTurnaround / 2024 Alky Turnaround
  * DelekCapital / Executive Capital Reviews
  * TylerRefineryTurnaround / Catalyst Change Outs
  * Eldorado / 100 Year Media
  * RailTeam / Rail Export 2025
  * TylerRefineryTurnaround / 2019 Alky Turnaround 1
  * Big Spring / Capital Projects
  * Big Spring / North Side


T4 · 17,244 files · 11.59 GB
Most sensitivity · locked until release 
5 sites in this release

Screenshot of the leak post

Sources

Leak posthttp://helixr2sncrd3ndsz5oho6mzqw3x5u7mvox5zcsngc5wm7v4l5k7oryd.onion/p/169f107db2a3ef002d03c665c3adf1f71560d1c5463ef35f720a9d5062f80d4b

Source

Indexed 2 hours 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 HELIX

HELIX is an active ransomware group with 10 confirmed victims as of August 2026, operating one onion leak site. The small victim tally points to either a recent entry or selective targeting. The group has been linked to 19 public disclosures across our corpus. The operation is currently active.

Timeline of this disclosure

August 19, 2026Delek US listed by HELIXon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Energy & Utilities sector, which has 168 disclosures indexed across all operators we track. Geographically, Delek US is reported in United States, a country with 3,162 ransomware disclosures in our corpus.

If your organisation is affected

A listing by HELIX means Delek US 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 HELIX'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.