How to Decrypt .blackfield Files from Blackfield Ransomware?

Our Proprietary Blackfield Decryptor

Our research team has spent months studying the Blackfield ransomware family and developed a decryptor capable of restoring files for multiple compromised organizations across the globe. Compatible with Windows, Linux, and VMware ESXi, this decryptor is engineered for precision, reliability, and speed.

Related article: How to Decrypt MedusaLocker3 / Far Attack Ransomware (.lockfile4) and Recover Files?

The Decryption Framework Explained

Blackfield’s encryption has been reverse-engineered, allowing us to build a solution that works in diverse environments. Our approach combines:

• AI and Blockchain Validation: Encrypted data is processed in a secure cloud framework, with blockchain ensuring file integrity.
  
• Victim ID Matching: Each ransom note includes a unique login ID, which our tool uses to target the specific encryption set.
  
• Universal Key Option: If the ransom note is missing, our premium decryption solution supports newer variants of Blackfield.
  
• Safe File Handling: The decryptor runs in read-only scan mode first to identify recoverable files before attempting restoration.

Also read: How to Decrypt 707 Ransomware (.707) and Recover Your Files?

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Prerequisites for Running the Decryptor

Before attempting recovery, ensure you have:

• The ransom note file (usually named blackfield_readme.txt)
  
• Access to affected encrypted files
  
• Stable internet connectivity for cloud-based decryption
  
• Administrative rights on the impacted system

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First Response Measures After a Blackfield Infection

Time is critical after a Blackfield attack. Immediate measures include:

• Disconnect Systems Quickly: Isolate infected machines to prevent the ransomware from propagating to shared drives, servers, or backups.
  
• Preserve All Evidence: Do not delete the ransom note or modify encrypted files. Save log data, traffic captures, and hashes for forensic analysis.
  
• Power Down Compromised Devices: Avoid reboots, which may trigger further scripts. Do not reformat storage as it reduces recovery chances.
  
• Seek Expert Help: Avoid unverified decryptors from forums. A professional recovery service maximizes the chances of file restoration.

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Recovering Data Encrypted by Blackfield Ransomware

Blackfield ransomware has emerged as a destructive family targeting enterprises, healthcare, government, and manufacturing sectors. Our decryptor is designed to work across major operating systems and exploits flaws in Blackfield’s encryption to restore files without ransom payments.

Available Recovery Strategies

Free Options

Community Decryptors (Older Variants)
Earlier versions of Blackfield used weaker encryption. Security vendors have released limited decryptors for legacy samples, but these are ineffective against current versions using stronger cryptography.

System Backups
If clean backups exist, organizations can rebuild systems. Verification of backup integrity is essential, as Blackfield often attempts to delete or corrupt snapshots. Immutable and offsite storage significantly improves recovery chances.

Virtualization Rollbacks
For enterprises using VMware or Proxmox, reverting to snapshots created prior to the attack can restore systems within minutes. However, these snapshots must be verified to ensure they weren’t tampered with.

Paid Options

Paying the Attackers
Victims sometimes resort to ransom payments, which provide a decryptor tied to the victim ID. However, risks include partial recovery, corrupt tools, and potential legal violations.

Third-Party Negotiation
Professional negotiators can sometimes lower ransom amounts and validate the decryptor before payment. These services come with high costs but reduce the risks of scams.

Specialized Decryptor by Our Team

Our team offers a cloud-driven decryptor for Blackfield ransomware that uses victim ID mapping and blockchain verification. Encrypted files are safely processed in sandboxed environments to ensure accurate recovery.

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Steps for Using the Blackfield Decryptor

1. Confirm infection by checking for extensions like .blackfield and the presence of blackfield_readme.txt.
   
2. Disconnect compromised systems from the network.
   
3. Submit encrypted files and ransom notes for analysis.
   
4. Run the decryptor as administrator to allow full system access.
   
5. Enter the victim ID from the ransom note.
   
6. Begin the decryption process and restore files to their original state.
   

Both offline and online methods are supported. Offline is recommended for isolated networks, while online ensures faster results with expert assistance.

Also read: How to Remove Charon Ransomware (.Charon) and Restore Encrypted Data?

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Understanding Blackfield Ransomware

Blackfield is a sophisticated RaaS (Ransomware-as-a-Service) model known for targeting large-scale infrastructure. Like other advanced ransomware, it employs double extortion: encrypting data while also stealing sensitive files to pressure victims into paying.

The malware spreads quickly within corporate environments, disabling backups, corrupting recovery tools, and exfiltrating data to attacker-controlled servers.

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Technical Arsenal and Intrusion Tactics

Blackfield ransomware operators employ a mix of off-the-shelf tools and custom malware. Their approach follows a structured kill chain aligned with MITRE ATT&CK, ranging from initial access to data theft and encryption.

Tools and Utilities Observed

Tool / Method	MITRE ATT&CK Mapping	Purpose in Attack
Mimikatz, LaZagne	Credential Access (T1003)	Dumping cached credentials, harvesting plaintext passwords from browsers and memory.
SoftPerfect Network Scanner, AdFind	Discovery (T1087, T1018)	Enumerating users, groups, and Active Directory structure.
PsExec, SMB exploitation	Lateral Movement (T1021)	Executing payloads remotely and spreading ransomware across network shares.
AnyDesk, Ngrok	Persistence & Remote Access (T1219, T1105)	Maintaining access post-exploitation, tunneling traffic, enabling covert control.
RClone, FileZilla, WinSCP, Mega Upload	Exfiltration (T1567)	Uploading stolen data before encryption (double extortion model).
Custom Blackfield encryptor (AES + RSA)	Impact (T1486)	Encrypting files with .BlackFL extension and deleting shadow copies.

Infection Pathways

• Initial Access: Weak or unprotected RDP endpoints, phishing emails with weaponized attachments, exploitation of vulnerable VPNs.
  
• Privilege Escalation: Credential theft via Mimikatz/LaZagne, leveraging domain admin accounts.
  
• Defense Evasion: Terminating antivirus processes, disabling recovery points, and occasionally using BYOVD (Bring Your Own Vulnerable Driver) tools.
  
• Exfiltration: Corporate data siphoned via RClone and cloud storage services, ensuring leverage before ransom demands.
  
• Encryption & Ransom Demand: AES + RSA hybrid encryption applied, files renamed with .BlackFL extension, ransom note BlackField_ReadMe.txt dropped.
  

Indicators of Compromise (IOCs)

• File Artifacts:
  
  1. Ransom note: BlackField_ReadMe.txt
     
  2. Encrypted files: *.BlackFL
     
  3. Malicious binary: Randomly named .exe in %TEMP%
     
• Hashes (sample):
  
  1. MD5: 6c4fa3e0eedb3100f4757bd2172bec9f
     
  2. SHA-1: 5d8c9959c37fcf51c33a59d87d73f5fed90aa05b
     
  3. SHA-256: 14468d1a661ce6296e3b0ee696d8c95b3798138668463e142046c056fb870b68
     
• Network Indicators:
  
  1. Email: yamag@onionmail.org
     
  2. Backup Email: yamag@tuta.io
     
  3. Telegram: @gotchadec

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Mitigation Best Practices

Organizations should enforce multi-factor authentication for VPNs, apply patches promptly, segment networks, and use continuous monitoring to detect lateral movement and suspicious data transfers. Preventing vulnerable driver loading is especially important in mitigating Blackfield infections.

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Victim Statistics and Trends

Geographic Distribution

Targeted Industries

Attack Timeline (Jan 2024 – Jul 2025)

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Blackfield Ransom Note

The ransom note typically reads like this:

Hi friends,

Whatever who you are and what your title is if you’re reading this it means the internal infrastructure of your company is fully or partially

dead, all your backups – virtual, physical – everything that we managed to reach – are completely removed. Moreover,

we have taken a great amount of your corporate data prior to encryption.

Well, for now let’s keep all the tears and resentment to ourselves and try to build a constructive dialogue.

 We’re fully aware of what damage we caused by locking your internal sources. At the moment, you have to know:

1. Dealing with us you will save A LOT due to we are not interested in ruining your financially. We will study in depth your finance,

 bank & income statements, your savings, investments etc. and present our reasonable demand to you. If you have an active cyber insurance,

 let us know and we will guide you how to properly use it. Also, dragging out the negotiation process will lead to failing of a deal.

2. Paying us you save your TIME, MONEY, EFFORTS and be back on track within 24 hours approximately.

Our decryptor works properly on any files or systems,

so you will be able to check it by requesting a test decryption service from the beginning of our conversation. If you decide to recover on your own,

 keep in mind that you can permanently lose access to some files or accidently corrupt them – in this case we won’t be able to help.

3. The security report or the exclusive first-hand information that you will receive upon reaching an agreement is of a great value,

 since NO full audit of your network will show you the vulnerabilities that we’ve managed to detect and used in order to get into,

 identify backup solutions and upload your data.

4. As for your data, if we fail to agree, we will try to sell personal information/trade secrets/databases/source codes – generally speaking,

 everything that has a value on the darkmarket – to multiple threat actors at ones. Then all of this will be published in our blog –

5. We’re more than negotiable and will definitely find the way to settle this quickly and reach an agreement which will satisfy both of us.

If you’re indeed interested in our assistance and the services we provide you can reach out to us following simple instructions:

Primary email : yamag@onionmail.org   use this as the title of your email SFbGThkOQBr3-CdxRU-locals

Secondary email(backup email in case we didn’t answer you in 24h) : yamag@tuta.io , TELEGRAM: @gotchadec

Keep in mind that the faster you will get in touch, the less damage we cause.

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Final Thoughts: Regaining Control After Blackfield

Though Blackfield ransomware presents a serious challenge, recovery is possible with the right tools and response strategy. Acting quickly, securing evidence, and avoiding unverified solutions is key to preventing permanent damage. Our Blackfield decryptor has already proven successful for multiple victims, helping organizations restore operations without paying ransom demands.

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Frequently Asked Questions

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