LockBit 3.0 Black Ransomware Decryptor

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Our response engineers maintain a bespoke decryptor and workflow tailored to LockBit 3.0 Black—the modern evolution of the LockBit RaaS ecosystem. This strain encrypts files with a hybrid AES-256 + RSA-2048 scheme and tags each item with a random 9-character extension (for example, .3R9qG8i3Z). Ransom notes mirror that token (e.g., 3R9qG8i3Z.README.txt) to bind your case to a unique ID.

The decryptor is designed to:

  • Safely analyze encrypted samples inside an isolated sandbox,
  • Detect variant-specific markers and the per-victim token, and
  • Restore data through a tightly logged, verifiable decryption process.

It’s available in both cloud-assisted and offline/air-gapped modes and always starts in read-only validation to protect evidence.

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How the Decryptor Works

After you provide sample encrypted files and the ransom note, our tooling fingerprints the payload—matching headers, the 9-char scheme, and crypto structure against our case library. If it aligns with a supported pattern or a workable weakness, we perform a Proof-of-Concept (PoC) decrypt on a small file set. Once validated, we proceed to full restoration under analyst supervision while generating integrity logs for insurance and legal use.

Requirements:

  • Ransom note like 3R9qG8i3Z.README.txt
  • 2–5 encrypted samples with the random 9-char extension
  • Admin privileges on a clean recovery host
  • Optional connectivity for cloud key checks

Immediate Response Checklist

  1. Isolate endpoints from LAN/Wi-Fi/VPN and unmount shared or backup volumes.
  2. Preserve artifacts (encrypted files + notes) exactly as found—no renaming or edits.
  3. Collect evidence: EDR/AV alerts, Windows Event Logs, firewall/proxy telemetry, suspicious executables.
  4. Capture RAM, if possible—some campaigns leave ephemeral material in memory.
  5. Engage a professional team; avoid contacting the actor’s Telegram or links yourself.

Recovery Paths

Free / Standard

Backups — Restore from offline or immutable copies after checksum validation.
Public tools — No free decryptor exists for LockBit 3.0 at the moment. Keep an eye on No More Ransom for future releases if a cryptographic flaw is published.

Specialist

Forensic decryptor service — We start with PoC decrypts, then scale up with full chain-of-custody logging.
Paying the ransom (not recommended) — Even small demands (e.g., the “Mr.Robot” note asks ~$45) don’t ensure reliable keys or prevent leaks; consult counsel and your insurer before any decision.

How to Use Our Decryptor — Step-by-Step

Assess the Infection — Confirm the random 9-character extension (e.g., .3R9qG8i3Z) and the matching README.txt.
Secure the Environment — Disconnect affected systems and block cloud/drive syncs.
Engage Our Team — Upload the note and a few samples via our secure intake; we’ll provide a timeline.
Run the Decryptor — Execute with admin rights; cloud checks are optional if you prefer offline mode.
Enter the Victim/Decryption ID — Copy the 32-hex ID from the note to bind your session.
Start Recovery — The tool restores files to a clean target path and produces integrity + completion logs.

Affected By Ransomware?
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Understanding LockBit 3.0 Black

Profile — A modular RaaS platform known for rapid updates, broad affiliate use, and layered extortion.
“PC Locker 3.0 by Mr.Robot” — A branded variant that borrows LockBit’s playbook, adds low-entry ransoms and “mentorship” marketing, and uses Telegram for contact.
Behavior — Encrypts documents, DBs, images, configs; deletes shadow copies; disables recovery; and often conducts exfiltration to enable double/triple extortion.

Ransom Note 

Typical name: 3R9qG8i3Z.README.txt
Distribution: Dropped in each encrypted folder.
Excerpt from the Ransom Note:

~~~ PC Locker 3.0 by Mr.Robot~~~

>>>> Your data are stolen and encrypted

To get your files back you will have to pay a one-time fee of $45 in bitcoin or monero.

>>>> You need contact us and decrypt one file for free on these platforms with your personal DECRYPTION ID

Contact the following account on telegram

@mr_robot_unlock

or paste this link in your browser

https://t.me/mr_robot_unlock

>>>> Your personal DECRYPTION ID: 4B75BFA39AA770FC5EA571B04865E784

>>>> Warning! Do not DELETE or MODIFY any files, it can lead to recovery problems!

>>>> Warning! If you do not pay the ransom you will not receive you files NO EXCEPTIONS!

>>>> Warning! Any attempt to negotiate or you don’t want to pay is INSTANT BLOCK!

>>>> Advertisement

Would you like to earn thousands of dollars $$$ ?

We sell mentorship for stealers, DDOS and ransomware.

We only work with professionals and people with money DO NOT WASTE OUR TIME.

—————————————————————————————————

IOCs, Detections & Technical Indicators

Name: LockBit 3.0 Black (aka PC Locker 3.0 by Mr.Robot)
Extension: 9-character random suffix (e.g., .3R9qG8i3Z)
Ransom note: [random9].README.txt
Encryption: AES-256 + RSA-2048
Example ID: 4B75BFA39AA770FC5EA571B04865E784

Detections (examples):

  • ESET — Win64/Filecoder.Lockbit.Black
  • Kaspersky — Trojan-Ransom.Win32.LockBit3.gen
  • Bitdefender — Gen:Heur.Ransom.LockBit3.0
  • Microsoft — Ransom:Win64/LockBitBlack.A!MTB

Common Indicators:

  • Shadow copy deletion / recovery disabled
  • Notes bearing “PC Locker 3.0 by Mr.Robot”
  • Telegram handle @mr_robot_unlock present in the note
  • Suspicious binaries under user/Temp paths

TTPs (MITRE-aligned)

  • Initial Access: Phishing, trojanized installers, stolen credentials/RDP.
  • Execution: AES/RSA file encryption; mass renaming with 9-char suffix.
  • Persistence: Registry/startup modifications.
  • Exfiltration: Staging and upload of sensitive data prior to encryption.
  • Impact: Encryption + extortion; possible DDoS pressure for non-payment.
Affected By Ransomware?
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Victim Landscape — Regions, Sectors & Timeline

Regions: Sectors:
Timeline:

Conclusion

LockBit 3.0 Black fuses robust encryption with relentless extortion, and the “PC Locker 3.0 by Mr.Robot” spin underscores how affiliates tailor tactics to widen their reach. Even when a ransom appears small, paying rarely guarantees safe or complete restoration and can expose an organization to ongoing pressure. The most reliable path forward is disciplined incident handling: isolate systems at once, preserve evidence, lean on verified PoC-based decryption or clean backups, and strengthen long-term resilience with layered identity controls, tight RDP posture, continuous monitoring, and offline or immutable backups. Acting early and methodically is the difference between a contained incident and a protracted operational crisis.

Frequently Asked Questions

Currently, there is no free public decryptor for LockBit 3.0 variants.

It spreads via phishing, cracked software, and credential theft, often leveraging social engineering and remote desktop attacks.

Each infection uses a unique 9-character random string appended to encrypted files, linking them to the victim’s unique ID.

No. Payment does not guarantee recovery and encourages future attacks.

Apply system updates regularly, restrict RDP access, enforce MFA, and maintain offline, immutable backups.

MedusaLocker Decryptor’s We Provide

MedusaLocker Ransomware Versions We Decrypt

CyberLock

GonzoFortuna

Destroy

Ako

Xciphered

Spider

Root

Root4

DavidHasselhoff

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