Full Report
This three-part blog series presents an analysis of 19 samples of a cross-platform LockBit 5.0 ransomware payload affecting Windows, Linux (LINUX Locker v1.06/v1.08), and ESXi (LINUX ESXi Locker v1.07) environments, highlighting how the ransomware operates, encrypts data, and interacts with targeted systems. By reverse engineering multiple samples, we identified shared components across platforms as well as operating system–specific behaviors that allow the malware to function efficiently in different environments.
Analysis Summary
# Tool/Technique: LockBit 5.0 Ransomware
## Overview
This summary covers the analysis of 19 samples of the LockBit 5.0 ransomware payload, which affects Windows, Linux (LINUX Locker v1.06/v1.08), and ESXi (LINUX ESXi Locker v1.07) environments. The analysis focuses on the shared components and operating system-specific behaviors that enable its cross-platform operation, focusing on how the ransomware encrypts data and interacts with targeted systems.
## Technical Details
- Type: Malware family (Ransomware)
- Platform: Windows, Linux, ESXi
- Capabilities: Cross-platform encryption, modern cryptographic stack implementation, stealthy installation, anti-analysis features.
- First Seen: (Information not explicitly stated in the provided context, derived from the analysis of the 'latest' version.)
## MITRE ATT&CK Mapping
*The provided text does not contain explicit MITRE ATT&CK mappings. The following are *inferred* common mappings for ransomware operations based on the described capabilities.*
- [TA0011 - Collection]
- [T1005 - Data from Local System]
- [TA0012 - Impact]
- [T1486 - Data Encrypted for Impact]
- [TA0005 - Defense Evasion]
- [T1027 - Obfuscated Files or Information] (Inferred from "Anti-Analysis")
## Functionality
### Core Capabilities
- **Cross-Platform Operation:** Executable code designed to target disparate operating systems (Windows, Linux, ESXi).
- **Data Encryption:** Utilizes a modern cryptographic stack, specifically mentioning a **ChaCha-family** cipher.
- **Encryption Mechanism:** Encryption utilizes a **rotate-based transform** method.
### Advanced Features
- **Stealthy Installation:** Implied presence of mechanisms to ensure covert deployment.
- **Anti-Analysis Capabilities:** Features designed to hinder reverse engineering and automated analysis environments.
- **OS-Specific Behavior:** Code includes modifications and tailored functions to operate efficiently across Windows, Linux, and ESXi infrastructures.
## Indicators of Compromise
- File Hashes: (None provided in the text excerpt.)
- File Names: Common names include:
- LINUX Locker v1.06/v1.08 (Linux variant)
- LINUX ESXi Locker v1.07 (ESXi variant)
- Registry Keys: (None provided in the text excerpt.)
- Network Indicators: (None provided in the text excerpt.)
- Behavioral Indicators: Encryption activity utilizing ChaCha-family ciphers with rotate-based transforms.
## Associated Threat Actors
- LockBit Ransomware Group
## Detection Methods
- Signature-based detection: Detection signatures for the specific binaries associated with LockBit 5.0.
- Behavioral detection: Monitoring for file system enumeration followed by mass encryption operations using ChaCha-family algorithms.
- YARA rules: (None provided in the text excerpt.)
## Mitigation Strategies
- Prevention measures focusing on robust endpoint detection and response across all targeted operating systems.
- Hardening recommendations should include segmentation to isolate ESXi environments and stringent access controls for Linux systems. Specific configuration hardening against known LockBit deployment vectors (initial access methods, which are not detailed here).
## Related Tools/Techniques
- Other LockBit variants (LockBit 3.0, etc.)
- Similar cross-platform ransomware efforts.
- ChaCha20 encryption (as a cryptographic component).