Breaking: .elock Zimbra Ransomware – File Recovery & Threat Analysis (2026 Update)
Direct Answer: The .elock ransomware (identified in threat intel circles as TargetZimbra) is an aggressive, Linux-based locker actively targeting Zimbra Collaboration Suite servers. By exploiting critical remote code execution (RCE) flaws, attackers deploy a cryptominer, steal email databases, and apply partial RSA encryption to server files. While a free, public decryptor is not available due to secure public-key cryptography, partial data recovery and containment are achievable through our specialized incident response services.
From the front lines of incident response, a compromised enterprise mail server is a massive crisis. Let’s cut through the noise. My team has spent hours analyzing the latest .elock payload (internally known as elockch). The threat actors are blending classic extortion with cryptomining, exploiting unpatched Zimbra instances to devastating effect. Because they rely on robust RSA encryption, there is no quick software fix you can download to magically unlock your mail store. However, we have identified structural weaknesses in their “partial encryption” technique that allow for strategic data salvaging without paying the ransom.
Also read: Breaking: .NSM Synology NAS Ransomware – File Recovery & Threat Analysis (2026)
Technical Identifiers for .elock / TargetZimbra Ransomware
| Identifier | Detail |
| Extension Name | .elock |
| Target Infrastructure | Linux / Zimbra Mail Servers (v8.8.11, 8.8.15) |
| Primary Exploits | CVE-2024-45519 (Postjournal RCE) & CVE-2026-73570 |
| Ransom Note Filename | !README_RECOVER.txt |
| Encryption Type | Asymmetric RSA (Partial Encryption – Headers only) |
| Malware Binary | elockch (Self-deleting post-encryption) |
| Threat Actor Contact | cccsitadm@proton.me |
What Does the Attacker Want? The Full Ransom Note Text
Transparency is your best weapon. Recognizing these manipulative tactics is the first step toward regaining control. Below is the complete, verbatim ransom note dropped by the .elock operators.
Plaintext
!!! All of the Company's Files Have Been Encrypted !!!
[Urgent Security Notice]
Please remain calm; this is just a business crisis.
We have successfully infiltrated your network and used military-grade algorithms to encrypt all of your servers.
Prior to the encryption, we stole significant amounts of sensitive corporate data.
If you refuse to negotiate, these data will be published on our dark web leak site, causing substantial financial and reputational damage.
If you wish to restore your system without exposing this data:
You must pay 50 XMR cryptocurrency.
Payment Address: 45EQACa2DVwHEMP2TcvhrgQgCeDUiwLnbcWrTmbUrHqZ1pFu8KJodc93PwXwEKeiegPesnddiVw47XdwZs1MZ68LFVjayY2
Failure to pay within 72 hours will result in a doubling of the ransom; failure to pay within one week will lead to the data being sold to your competitors and released publicly.
Upon making the payment, please send confirmation to the designated email address, and we will provide you with decryption tools.
Contact Email: cccsitadm@proton.me
Note the demand for Monero (XMR) rather than Bitcoin. XMR is a privacy coin, making it nearly impossible for law enforcement to track the funds on the blockchain.
Immediate Actions: Containment and Persistence Removal
Before you worry about decryption, you must stop the bleeding. The .elock payload doesn’t just encrypt; it drops persistent malicious processes, steals user credentials, and turns your server into a cryptomining zombie.
- Sever Network Connections: Immediately isolate the infected Zimbra server from the internet and the rest of your internal network to prevent lateral movement.
- Reset All Zimbra Credentials: The attackers actively exfiltrate usernames and passwords from the Zimbra database. You must force a password reset for all users globally to prevent immediate relay and spam abuse.
- Purge Malicious Artifacts: Our analysis confirms the malware establishes persistence and mining operations in the
tmpdirectory. You must identify and terminate processes associated with these specific artifacts before attempting restoration:/var/tmp/idle/var/tmp/.rguard/var/tmp/javab(The primary cryptominer)
- Block C2 Infrastructure: Null-route or firewall off outbound connections to the attackers’ command and control (C2) IPs:
90.16.74.161and89.44.32.243. - Preserve the Drive: Make a byte-for-byte forensic clone of the server before making any changes. The
elockchbinary deletes itself after execution, making memory dumps and forensic artifacts critical for our analysts.
Our Professional Recovery Process Explained
Because the threat actors used an embedded RSA Public Key, brute-forcing the encryption mathematically is impossible. However, to maximize the speed of their attack, the malware only encrypts the beginning (the header) of each file.
Our specialized incident response framework targets this exact vulnerability:
- Secure Case Intake: Submit your
!README_RECOVER.txtand a small sample of encrypted.elockfiles through our protected portal. - Binary & Artifact Analysis: Our forensics team analyzes the structural damage. Because only the initial blocks of data are encrypted, massive files (like large mail databases or archives) retain the vast majority of their plaintext data deeper within the file structure.
- Data Extraction & Reconstruction: Instead of attempting to break the RSA key, our engineers utilize proprietary carving tools to bypass the corrupted headers and extract the underlying unencrypted data, rebuilding mailboxes and databases from the surviving fragments.
- Vulnerability Patching: Once data is extracted, we assist in rebuilding your Zimbra instance, ensuring that CVE-2024-45519 and CVE-2026-73570 are fully patched, and SNMP services are properly secured.
This highly technical, data-carving approach requires a deep understanding of Linux file systems and database architecture, which is why it is handled strictly as a managed service.
Where to Go From Here
Patch management is no longer optional—it is a matter of survival. Report the incident to CISA and the FBI, as this directly involves actively exploited vulnerabilities. Do not contact cccsitadm@proton.me, as engaging with them only validates your data’s worth.
About the Author:
This threat intelligence advisory was produced by the security team at StopDjvuDecryptor.org. As a specialized ransomware research laboratory and division of Cloud Cover LLC—an Ohio-based Managed Service Provider—we deliver enterprise-grade incident response. Led by Lead Researcher Brent Kenreich, our mission is to provide victims with mathematically verified recovery alternatives to paying cybercriminals.
Copyright © 2026 Cloud Cover LLC. All rights reserved.
