Full Report
The VanHelsing ransomware-as-a-service operation published the source code for its affiliate panel, data leak blog, and Windows encryptor builder after an old developer tried to sell it on the RAMP cybercrime forum. [...]
Analysis Summary
# Tool/Technique: VanHelsing Ransomware Builder
## Overview
The VanHelsing ransomware builder has been leaked on a hacking forum, providing threat actors with the necessary components (builder, source code for the encryptor, decryptor, and loader) to conduct ransomware attacks or modify the existing code. The leaked materials also suggest development towards an MBR locker component.
## Technical Details
- Type: Malware Builder / Ransomware Source Code
- Platform: Windows (explicitly mentioned for the encryptor source code)
- Capabilities: Allows creation of custom ransomware variants, includes source code for the Windows encryptor, a decryptor, and a loader. Development included an MBR locker capability.
- First Seen: Information about the leak is recent relative to the article's context, but the ransomware itself is not historically dated in the provided snippet.
## MITRE ATT&CK Mapping
As this is a leaked builder and source code, the mappings cover the *potential* resulting malware's actions:
- **TA0011 - Command and Control** (Related to C2 communication via `api.php` endpoint in the affiliate panel)
- T1071 - Application Layer Protocol
- **TA0005 - Defense Evasion** (If obfuscation or anti-analysis techniques are utilized in the custom build)
- T1027 - Obfuscated Files or Information
- **TA0004 - Privilege Escalation** (Related to MBR manipulation)
- T1548 - Abuse Elevation Control Mechanism
- **TA0010 - Exfiltration** (Implied potential if custom features are added)
- **TA0003 - Persistence** (Implied potential if persistence mechanisms are included)
(Note: Specific T-numbers for the final ransomware are not provided, but standard ransomware TTPs apply.)
## Functionality
### Core Capabilities
- **Ransomware Generation:** The builder allows creation of functional ransomware executables.
- **Source Code Availability:** Source code for the Windows encryptor, decryptor, and a loader were leaked.
- **Affiliate Panel Components:** Included code for the `api.php` endpoint hosted via an affiliate panel, allowing modification or independent operation of the command/control structure.
### Advanced Features
- **MBR Locker Development:** The threat actors were working on an MBR locker component designed to replace the Master Boot Record with a custom bootloader displaying a lock message upon system startup.
## Indicators of Compromise
*No specific hardcoded IoCs (hashes, IPs, file names) were detailed in the context provided, outside of the internal component names.*
- File Hashes: [Not specified in context]
- File Names: [Encryptor source code, Decryptor source code, Loader source code]
- Registry Keys: [Not specified in context]
- Network Indicators: Affiliate panel relied on an `api.php` endpoint for operation (Full domain/IP defanged: [Not specified in context])
- Behavioral Indicators: Attempts to modify the Master Boot Record (MBR) if the MBR locker component is built and executed.
## Associated Threat Actors
The tool's builder leaked, meaning it can be used by **unaffiliated individual threat actors or new ransomware groups**. (Similar to how the Babuk, Conti, and LockBit builders were repurposed.)
## Detection Methods
- Detection methods would typically focus on the file characteristics of the generated executables or the behavior associated with running the builder/loader components.
- **Behavioral detection:** Monitoring attempts to write to the MBR area or unauthorized execution of encryption routines.
## Mitigation Strategies
- **Restrict the Use of Ransomware Builders:** Monitor file-sharing sites and hacking forums for unauthorized distribution of known or new ransomware development tools.
- **System Hardening:** Implement robust security controls to prevent the execution of unknown binaries built from leaked tools.
- **Restrict MBR/Boot Sector Writes:** Implement controls (like those offered by some EDR solutions or specific OS features) to prevent unauthorized modifications to the Master Boot Record.
## Related Tools/Techniques
* Ransomware builders whose source code has previously leaked and become widely adopted:
* Babuk Ransomware Builder
* Conti Ransomware Source Code
* LockBit Ransomware Builder