lso.com
embargo listed this organization on its leak site on Dec 6, 2025.
- Listing date
- Dec 6, 2025
- Attack date
- Dec 6, 2025
Listing text
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...
About the group
embargo posted its first listing on Apr 21, 2024 and has listed 41 organizations to date.
Embargo is a Rust-based ransomware-as-a-service group that emerged in April 2024, primarily targeting US healthcare, manufacturing, and business services organizations using double extortion, assessed as a potential successor to BlackCat/ALPHV with over $34 million in ransom proceeds.
Learning center
What does this listing mean?
Ransomware groups move data out of the organization before encrypting systems and threaten to publish it if the ransom is not paid. This method is called double extortion.
The listing shows that the group claims to have targeted the organization. Whether the data was published is shown by the later status of the listing.
What should you do if your organization is listed on a leak site?
- Record the listing and any published sample files; do not visit the leak site from the corporate network.
- Isolate affected systems and preserve logs without deleting them.
- Determine which data left the organization; if personal data is involved, review notification obligations with your legal team.
- Make any decision about the ransom demand together with legal, management and incident response.
- Do not bring systems back online before the attacker’s entry point is closed.
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