Ransomware group profile · #275 by claimed victims
Grief ransomware
Doppelpaymer is a ransomware family that encrypts user data and later on it asks for a ransom in order to restore original files. It is recognizable by its trademark file extension added to encrypted files: .doppeled. It also creates a note file named: ".how2decrypt.txt".
Victimology
Who Grief claims to have breached, from 3 leak-site posts recorded by VULONE.
Claims per month last 12 months
Top sectors
Top countries
Latest claimed victims 3 most recent
| Victim | Sector | Country | Claimed |
|---|---|---|---|
| Booneville School District | Education | US | 30 Jun 2021 |
| Lancaster Independent School District | Education | US | 9 Jun 2021 |
| Clover Park School District | Education | US | 26 May 2021 |
All 3 Grief victims, searchable
Full victim list with claim posts, domains, timing and exports, plus the negotiation chats and leak-site screenshots VULONE archives for this crew.
Tactics, techniques and procedures
ATT&CK technique mapping for Grief is in progress. Victimology, infrastructure status and leak-site tracking are live above.
Indicators, detections and the full playbook
Hashes, C2 addresses, onion services, Sigma and YARA detections per technique, and the negotiation transcripts are available to signed-in analysts.
Frequently asked
Is Grief ransomware still active?
How many victims has Grief claimed?
Which industries does Grief target?
Which countries are most affected by Grief?
Where does VULONE get Grief victim data?
VULONE research mentioning Grief
Other ransomware groups
Qilin
Lockbit3
Akira
ClopVictim claims are collected from leak sites and enrichment partners (ransomware.live, RansomLook) and represent the group's own assertions, not confirmed breaches. Profile last updated 16 September 2026. Questions or corrections: [email protected].
