Disclosure context

About MEDUSA LOCKER (aka BAVACAI

MedusaLocker (also identified under the alias BAVACAI) is a ransomware group first observed in May 2026, operating with a primary financial motivation consistent with contemporary cybercriminal ransomware operations. Due to the extremely limited public documentation available at this time — with only a single known victim on record and a very recent emergence date — comprehensive attribution, origin, and affiliation details cannot be responsibly stated without risking speculation beyond what is publicly confirmed by authoritative sources such as CISA, the FBI, or Mandiant. It should be noted that a separate, well-documented ransomware family also named MedusaLocker has been publicly tracked since 2019 and operates as a Ransomware-as-a-Service model; whether this BAVACAI-aliased entity represents a rebrand, offshoot, or entirely distinct group sharing the name is not confirmed by available public intelligence. Given the single known victim and the May 2026 first-observed date, this group should be considered an emerging or early-stage threat with minimal public threat intelligence footprint, and analysts are advised to treat any further characterization as preliminary pending additional reporting from law enforcement or the security research community. Monitoring for additional victim disclosures, leak site activity, and technical indicators will be necessary to develop a more complete operational profile. The group has been linked to 4 public disclosures across our corpus. First observed on a leak site on May 15, 2026; most recent post May 20, 2026. The operation is currently active.

Timeline of this disclosure

May 20, 2026Moravia listed by MEDUSA LOCKER (aka BAVACAIon the group's public leak site

Sector and geography

Geographically, Moravia is reported in Costa Rica.

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

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Moravia

Claimed by MEDUSA LOCKER (aka BAVACAI · listed 23 hours ago

Today

Age

since listed · listed for ransom

Status timeline

Listed
May 20, 2026

Current state: Listed for ransom

At a glance

Group: MEDUSA LOCKER (aka BAVACAI
Status: Listed for ransom
Country: Costa Rica
Listed on leak site: May 20, 2026

About the victim

AI dossier — public-source company profile

Moravia is an entity located in San José, Costa Rica. No public site content was available to determine the nature of its operations, scale, or sector. The name 'Moravia' may refer to a district within San José or a company bearing that name.

Address: San José, Costa Rica

Attack summary

Severity: medium — The group has advertised demo file access suggesting exfiltration has occurred, but no data size, data type, or ransom amount has been disclosed, and the sector and data sensitivity are unknown.

MEDUSA LOCKER (aka BAVACAI) claims to have compromised Moravia and is advertising demo access to up to 10 files per folder, with full data to be published after a presumed ransom deadline.

medium

What the group claims

Organization located in Moravia, San José, Costa Rica listed on MedusaLocker ransomware leak site.

The leak post

captured from the group's site

Moravia, San José, Costa Rica
⚠ Demo access — showing up to 10 files per folder. Full data will be available after publication.

Sources

Leak posthttp://t33zoj4qwv455fog7qnb2azi5xcdxkixughmmduzbw2rtdgryqfbh6id.onion/company/baratai/

Source

Indexed 23 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.