Medusalocker
Since Nov 15, 2022, Medusalocker has listed 126 organizations on its leak site.
Listings per month
- Total listings
- 126
- First listing
- Nov 15, 2022
- Latest listing
- Nov 4, 2026
- MITRE ATT&CK techniques
- 1
Medusa is a DDoS bot written in .NET 2.0. In its current incarnation its C&C protocol is based on HTTP, while its predecessor made use of IRC.
It posted 75 listings in the last 12 months; the busiest month was November 2026 (18 listings).
Most targeted country: United States, with 13 listings (10% of the total).
Most targeted sector: Technology, with 21 listings (17% of the total).
Targeted countries
Showing 10 of 126 results
1 MITRE ATT&CK techniques across 1 stages are documented in the group's attacks.
- 1
Privilege escalation
The attacker moves to accounts with higher privileges.
T1134.004Parent PID Spoofing
What does a ransomware group do?
Ransomware groups break into corporate networks, move data out and encrypt systems. If the ransom is not paid, they list the organization on a leak site and threaten to publish the data.
Which defenses matter most?
Priority defenses based on the documented techniques:
- Reduce local administrator accounts and perform privileged tasks from separate, monitored accounts.
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.
Is your organization mentioned?
Search with your domain to check whether your organization appears in ransomware listings, leaked records, forums and Telegram channels.
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Customer intelligence on top of Infostealer Detection: leaked accounts of end users who sign in to your site.