Benzona Ransomware Analysis: IOCs, Decryption Possibilities, and Defense Strategies

Cyberlord Security Team

Benzona Ransomware Analysis: IOCs, Decryption Possibilities, and Defense Strategies

In November 2025, a sophisticated new ransomware strain known as Benzona emerged, quickly making a name for itself by targeting organizations across Europe, Asia, and West Africa. Operating on a Ransomware-as-a-Service (RaaS) model, Benzona employs aggressive double-extortion tactics, threatening to leak sensitive data if its demands are not met.

This technical analysis breaks down the Benzona attack chain, Indicators of Compromise (IOCs), and actionable defense strategies for security professionals.

Benzona Ransomware Analysis

The Benzona Attack Chain

Benzona follows a structured attack lifecycle designed to maximize impact and hinder recovery.

1. Initial Access & Execution

Attackers typically gain entry through phishing campaigns, compromised credentials, or exploiting unpatched vulnerabilities in public-facing applications. Once inside, the ransomware utilizes:

  • Process Injection (T1055): Injecting malicious code into legitimate processes to evade detection.
  • Scripting Interpreters (T1059): Leveraging PowerShell to execute commands and disable security controls.

2. Evasion & Persistence

To maintain access and avoid antivirus detection, Benzona:

  • Disables Recovery: It executes commands to delete Volume Shadow Copies (vssadmin.exe Delete Shadows /All /Quiet) and remove Windows Restore points.
  • Terminates Processes: It kills security software and virtualization processes to prevent analysis and ensure files are not locked during encryption.
  • Modifies Registry: It alters registry keys to ensure persistence across reboots.

3. Encryption & Exfiltration (Double Extortion)

Benzona uses strong cryptographic algorithms to lock victim files.

  • File Extension: Encrypted files are appended with the .benzona extension (e.g., financial_report.pdf.benzona).
  • Data Theft: Before encryption, the malware exfiltrates sensitive data to a command-and-control (C2) server. This stolen data is the leverage for the second stage of extortion.

4. The Ransom Note

After encryption is complete, a ransom note titled RECOVERY_INFO.txt is dropped in affected directories. The note typically contains:

  • A warning that files are encrypted and data has been stolen.
  • A threat to publish the data if the ransom is not paid within 72 hours.
  • Instructions to download the Tor Browser and visit a specific .onion chat portal for negotiation.

Indicators of Compromise (IOCs)

Security teams should scan for the following indicators to detect Benzona activity.

File Indicators

  • Extension: .benzona
  • Ransom Note: RECOVERY_INFO.txt

Network Indicators

  • Tor Chat Portal: http://rwsu75mtgj5oiz3alkfpnxnopcbiqed6wllyoffpuruuu6my6imjzuqd.onion/
  • Leak Site: http://benzona6x5ggng3hx52h4mak5sgx5vukrdlrrd3of54g2uppqog2joyd.onion

File Hashes (SHA-256)

  • 09f7432834ce15e701aa7fcc84a9c2441c1c7e0a9cb66a6211845be73d2597cc
  • 1c895eeb1d6ab9e5268759558c765b93f4c183557cb2c457857b91532ac61982

Defense & Mitigation Strategies

There is currently no free decryptor available for Benzona ransomware. Prevention and rapid response are your only defenses.

  1. Immutable Backups: Ensure you have offline, immutable backups. Benzona targets and deletes online backups and shadow copies.
  2. Patch Management: Prioritize patching internet-facing systems to prevent initial access.
  3. Network Segmentation: Limit lateral movement by segmenting critical networks.
  4. Endpoint Detection and Response (EDR): Deploy EDR solutions configured to block process injection and mass file modifications.
  5. User Training: Conduct phishing simulations to educate employees on recognizing malicious emails.

Conclusion

Benzona represents the continued evolution of RaaS threats in late 2025. Its use of double extortion and anti-recovery techniques makes it a formidable adversary. Organizations must move from a reactive stance to a proactive "assume breach" mentality, focusing on resilience and rapid recovery.

If you have been hit by Benzona, do not pay the ransom immediately. Contact a professional incident response team to assess your options.

benzona ransomware analysis guide overview

Key decisions, risks, and implementation actions for benzona ransomware analysis guide.

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