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BlackLock Attacks Worldwide Systems with Cross-Platform Capabilities

Cyber Security

Business Honor - BlackLock Global Cyber Attacks

Business Honor
22 September, 2025

BlackLock ransomware uses advanced encryption to attack Windows, Linux, and ESXi systems, resulting in major worldwide cybersecurity threats.

BlackLock, a new ransomware group, is becoming a major threat to businesses across the world. The group, first appeared as El Dorado in March 2024, later this year altered its name to BlackLock. It currently runs a Ransomware-as-a-Service (RaaS) business and recruits supporters on Russian-language cybercrime sites. The modular nature of BlackLock makes it extremely dangerous. Suitable for Windows, Linux, and VMware ESXi systems and developed in the Go programming language. Allowing attackers to target different areas of a business quickly, including virtual servers and user computers.

ChaCha20 is one of the strong methods of encryption used by BlackLock to lock files. Each file has its unique keys and numbers, making it difficult for victims to recover their data without paying the ransom amount. In addition, it makes use of a secret box and Elliptic Curve Diffie-Hellman (ECDH) key exchange. Seal() adds another level of protection to protect victim information and file data.

Attackers have a lot of options with the malware, including focusing on particular folders, using several threads, delaying operation, or stealing just a part of files to quicken the process. Despite having a VMware ESXi setup, this feature is not completely activated. Using go-smb2 to access SMB shares, BlackLock propagates throughout networks, allowing malware to migrate laterally and encrypt information. Both standard passwords and NTLM hashes can be used to log in. It uses covert, hard to detect methods to empty the Recycle Bin and shadow copies to avoid recovery.

A ransom note called HOW_RETURN_YOUR_DATA.TXT is included in each encrypted folder, alerting victims to the possibility of data leaks and public disclosure. Signaling the next wave of ransomware, according to experts, where centralized payments, automation, and AI make it hard to prevent future attacks. Before the next major danger arrives, businesses need to strengthen their security measures.