Disclosure context

About Embargo

Embargo is a ransomware group that emerged in April 2024, operating with primarily financial motivations and demonstrating a focus on high-value targets across multiple sectors. The group has been observed targeting victims predominantly in the United States, Singapore, India, and France, with particular emphasis on technology, healthcare, manufacturing, business services, and financial sectors. Given the group's recent emergence and limited public documentation from major threat intelligence sources, specific details about their country of origin, operational structure, and technical methodologies remain largely unconfirmed by established security research organizations. With 37 known victims identified since their emergence, Embargo appears to follow established ransomware operational patterns typical of financially-motivated cybercriminal groups, though comprehensive analysis of their attack vectors, encryption methods, and extortion tactics has not yet been extensively documented by major cybersecurity firms or government agencies. The group's targeting of critical infrastructure sectors including healthcare and financial services aligns with broader ransomware trends observed throughout 2024, though specific notable campaigns or high-profile attacks have not been widely reported in public threat intelligence reporting. As of current observations, Embargo appears to remain active, though the limited timeframe since their emergence and sparse public documentation makes definitive assessment of their operational status challenging without additional confirmed reporting from established threat intelligence sources. The group has been linked to 38 public disclosures across our corpus. First observed on a leak site on April 21, 2024; most recent post March 31, 2026. The operation is currently active.

Timeline of this disclosure

December 6, 2025lso.com listed by Embargoon the group's public leak site

Data size: 500 GB

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, lso.com is reported in LS.

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

Lone Star Overnight (LSO)

listed as lso.com · Claimed by Embargo · listed 6 months ago

500 GB

Data size

Age

since listed · data leaked

Status timeline

Listed
Dec 6, 2025
Data leaked

At a glance

Group: Embargo
Status: Data leaked
Country: LS
Sector: Transportation/Logistics
Listed on leak site: Dec 6, 2025
Data size: 500 GB

About the victim

AI dossier — public-source company profile

Lone Star Overnight (LSO), headquartered in Austin, Texas, is a leading regional parcel delivery company with over 30 years of operation. LSO offers a range of shipping services including overnight, ground, e-commerce, and Mexico delivery options, serving customers across multiple industries such as automotive, food & beverage, healthcare, and retail. The company operates a network of service centers primarily within the southern United States.

Industry: Regional Parcel Delivery & Shipping Logistics
Address: Austin, Texas, USA

Attack summary

Severity: high — The group claims both encryption of systems and exfiltration of ~500 GB of data, with data now published. As a parcel delivery company, the dataset likely contains customer PII, shipping records, and business-sensitive information at significant scale, constituting confirmed exfiltration of substantial business and potentially regulated data.

The Embargo ransomware group claims to have encrypted LSO's systems and exfiltrated approximately 500 GB of data in total, publishing the data after the company allegedly failed to engage with their ransom demands.

high

Data the group says was taken

AI dossier — extracted from the leak post

Exfiltrated business data (~500 GB total)
Operational/logistics records
Potentially customer shipping data
Potentially employee/HR data

What the group claims

Lone Star Overnight (LSO) is headquartered in Austin, Texas, and, over the last 30 years, has become a leading regional parcel delivery company. LSO has a netwo... - LSO does not understand encryption so we demonstrated for them how encryption works. We have ~500 GB data total includin...

Sources

Source

Indexed 6 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.