Introduction to DeLocker Ransomware
DeLocker ransomware is a recently discovered and highly aggressive strain of file-encrypting malware. Cybersecurity analysts first spotted it in targeted attacks against NAS systems, especially those running QNAP. Once deployed, it encrypts critical business and personal files, then appends file extensions like .delocker1, .delocker10, .delocker5, and .delocker20. After encryption, it leaves behind a ransom note titled READ_THIS_NOTE.html, threatening victims with exposure of stolen data and demanding payment for decryption tools.
The malware leverages powerful encryption algorithms such as RSA combined with AES, making manual decryption practically impossible without the unique private keys held by the attackers.
Related article: 01flip Ransomware Decryption and Removal Using Phobos Decryptor
How DeLocker Ransomware Works?
File Encryption Method
DeLocker employs a dual-layer encryption model (RSA + AES), converting user data into unreadable ciphertext. This effectively locks victims out of their own files, causing operational chaos.
Also read: Backups Ransomware Decryption and Removal Using Phobos Decryptor
Extensions Used
Each affected file is renamed with specific extensions such as:
- filename.docx.delocker1
- invoice.pdf.delocker5
- backup.zip.delocker10
- photo.jpg.delocker20
These varying extensions reflect the encryption phase or victim-specific identifiers used by the malware.
Threat Scope on Networks
Once inside a system, DeLocker can spread laterally across network drives, especially in environments with shared credentials or outdated security protocols. This makes business networks and NAS-based infrastructures highly susceptible.
The Ransom Note: READ_THIS_NOTE.html
Full Text Breakdown
Here’s what victims see upon opening the ransom note:
Your personal ID:
Zq5BBIMjEhac3eD/b51ARCJoExfIMjKbjy8iQJuTU+i4KlZZ0TXazWsN3RDtRVs5lod/mDECEiH6F/oBBIBjwy2f/rNZ8nzooLsISHC07FtNViQ+3uHAkQhesIfoZS0Kw/AU31rMJObcR2o/nzdoabfWR4dab3TJAgGux5vpFsTtzPHeBHJzvGc0mLWSDKZOBHuGooe/N6s0xZ5JPOgmzY9W/gjnkQJQo9voy0wgc/2zchbpVnvzaW5iVwnRG9YmIEDSGXTrw+L6Yj3SP+5+ovUud6FiAt+eRwRM07c8CCyQCwwOXEET5q2HABsG8uC/0myXkrPOYKJpGBlBoPWN4A==
/!\ YOUR COMPANY NETWORK HAS BEEN PENETRATED /!\
All your important files have been encrypted!
Your files are safe! Only modified. (RSA+AES)
ANY ATTEMPT TO RESTORE YOUR FILES WITH THIRD-PARTY SOFTWARE
WILL PERMANENTLY CORRUPT IT.
DO NOT MODIFY ENCRYPTED FILES.
DO NOT RENAME ENCRYPTED FILES.
No software available on internet can help you. We are the only ones able to
solve your problem.
We gathered highly confidential/personal data. These data are currently stored on
a private server. This server will be immediately destroyed after your payment.
If you decide to not pay, we will release your data to public or re-seller.
So you can expect your data to be publicly available in the near future..
We only seek money and our goal is not to damage your reputation or prevent
your business from running.
You will can send us 2-3 non-important files and we will decrypt it for free
to prove we are able to give your files back.
Contact us for price and get decryption software.
email:
* To contact us, create a new free email account on the site: protonmail.com
IF YOU DON’T CONTACT US WITHIN 72 HOURS, PRICE WILL BE HIGHER.
Psychological Tactics Used
The ransom note is designed to induce fear and urgency by:
- Claiming data theft and public leak threats.
- Offering “proof” by decrypting 2–3 test files.
- Warning about the price increase after 72 hours.
Ransom Demands and Instructions
- No direct amount is initially stated, but attackers request victims to contact them for the price.
- Communication Methods: Victims must email the attackers or use TOR-based chat for negotiation.
- Payment Format: Typically demanded in cryptocurrency (Bitcoin), with no refunds or guarantees.
The note emphasizes no third-party tool will work, discouraging victims from seeking help elsewhere.
Targeted Systems and Environments
Although DeLocker has potential to infect generic Windows machines, its main targets are QNAP devices and other NAS systems. This aligns with a growing trend in 2024-2025 where cybercriminals aim for high-value enterprise storage with remote access vulnerabilities.
These devices are often exposed online with weak or reused passwords, making them easy prey.
Propagation Techniques and Infection Vectors
DeLocker spreads using common yet effective attack methods:
- Phishing Emails: Hidden malicious attachments or fake invoice links.
- Drive-by Downloads: Triggered from deceptive ads or redirects.
- P2P and Torrent Platforms: Bundled with pirated software or “cracked” apps.
- Remote Exploits: Attacks on outdated NAS firmware or exposed SMB protocols.
- Social Engineering: Fake tech support schemes convincing users to install malware.
Key Symptoms of DeLocker Infection
Victims may observe:
- Files renamed with .delocker1, .delocker10, etc.
- Inability to open documents, images, or databases.
- Appearance of READ_THIS_NOTE.html across directories.
- Increased CPU/network activity from background malware.
Often, DeLocker is part of a multi-stage attack, meaning password stealers or spyware could be involved too.
Data Exfiltration and Threat of Exposure
The ransom note explicitly states that:
“We gathered highly confidential/personal data… if you decide not to pay, we will release your data.”
This makes DeLocker a double-extortion ransomware, threatening victims with data leaks in addition to encryption.
Can You Decrypt DeLocker Ransomware Files?
Currently, no universal decryption tool exists for DeLocker. The ransomware uses per-victim key generation, meaning each attack is uniquely encrypted.
Using generic decryptors can corrupt your files further. That’s where a purpose-built solution like Phobos Decryptor comes into play.
Introducing the Phobos Decryptor for DeLocker
Our custom-built Phobos Decryptor has been engineered to specifically combat DeLocker’s encryption methods. It’s tested, safe, and supports NAS-based environments like QNAP.
Why Is It Trusted?
- Purpose-built for DeLocker ransomware
- Preserves file integrity without partial recovery or corruption
- Works with QNAP backups and encrypted volumes
- Simple to use, no advanced technical knowledge required
How to Use the Phobos Decryptor?
Step-by-Step Guide:
- Obtain the Tool: Contact us to get our decryption tool.
- Run as Administrator: Ensure the tool has full system permissions.
- Connect to Internet: The tool communicates securely with our server.
- Input Victim ID: Found inside the ransom note (READ_THIS_NOTE.html).
- Click “Decrypt”: Sit back and let the tool recover your files safely.
Also read: DarkHack Ransomware Decryption and Removal Using Phobos Decryptor
Why Phobos Decryptor Beats the Alternatives?
- Tested Against DeLocker: Proven to reverse its encryption.
- Zero Data Loss: Preserves file metadata and structure.
- Live Support: Our experts are available for hands-on assistance.
- No Ransom Payments Needed: Save money and prevent future threats.
Prevention and Protection Tips
- Update NAS Firmware: Always use the latest QNAP QTS version.
- Backups Are Vital: Maintain off-site or cloud-based encrypted backups.
- Disable Unused Ports: Especially remote admin access or UPnP.
- Use Strong Credentials: Avoid shared or reused passwords.
- Install Antivirus Tools: Use trusted tools like Combo Cleaner or MalwareRemover.
- User Training: Teach employees to spot phishing and fake downloads.
What to Do If You’re Infected
- Isolate the Device Immediately
- Run Full Antivirus Scan
- Use Phobos Decryptor for Recovery
- Patch and Secure All Firmware
- Monitor Network Activity
Conclusion: Fighting Back Against DeLocker
DeLocker ransomware poses a real and immediate threat to business and personal data, especially within QNAP and NAS environments. Without backups, recovery becomes nearly impossible without paying a steep ransom—unless you have access to a tool like Phobos Decryptor.
By staying vigilant, maintaining system updates, and practicing good cybersecurity hygiene, you can defend against ransomware threats like DeLocker and ensure your data remains safe and uncompromised.
FAQs About DeLocker Ransomware
What is DeLocker ransomware?
DeLocker is a ransomware strain that encrypts files on QNAP/NAS systems and demands ransom via a file named READ_THIS_NOTE.html.
What file extensions does it use?
It appends .delocker1, .delocker5, .delocker10, and .delocker20 to encrypted files.
Can I recover files without paying the ransom?
Yes, using our Phobos Decryptor tool designed specifically for DeLocker.
What should I do first after discovering an infection?
Disconnect the device from the network and run a security scan. Avoid modifying encrypted files.
Can antivirus software remove the ransomware?
Yes, tools like Combo Cleaner can remove the active threat, but they won’t decrypt files.
How does DeLocker spread?
It spreads via phishing, infected downloads, remote exploits on NAS, and unpatched vulnerabilities.