Full Report
2025-02-20 • Orange Cyberdefense • Alexis Bonnefoi, Marine PICHON • win.nailao_locker Open article on Malpedia
Analysis Summary
This summary is based on the provided article description, focusing on the malware family mentioned.
# Tool/Technique: NailaoLocker
## Overview
NailaoLocker is a ransomware strain that has been observed being distributed in Europe. Its distribution chain involves established malware backdoors, specifically ShadowPad and PlugX.
## Technical Details
- Type: Malware (Ransomware)
- Platform: Unknown (Typically Windows for most ransomware variants, but specific operating system is not detailed in the context)
- Capabilities: Encryption of files leading to extortion.
- First Seen: Not explicitly stated, but the context implies recent activity around the article date (2025-02-20).
## MITRE ATT&CK Mapping
*Note: Since NailaoLocker is ransomware delivered via specific backdoors, the mapping heavily reflects the delivery mechanism and the final impact.*
- **TA0001 - Initial Access** (Via ShadowPad/PlugX backdoors)
- T1566 - Phishing (Plausible, but not explicitly stated as the initial vector for the backdoors)
- **TA0003 - Persistence** (Likely established by the backdoors)
- T1547 - Boot or Logon Autostart Execution
- **TA0004 - Privilege Escalation** (Likely established by the backdoors)
- **TA0011 - Command and Control** (Established by ShadowPad/PlugX)
- T1071 - Application Layer Protocol
- **TA0040 - Impact**
- T1486 - Data Encrypted for Impact (Ransomware activity)
## Functionality
### Core Capabilities
- Delivery and execution of the ransomware payload onto compromised systems.
- Encrypting victim files to demand a ransom payment for decryption keys.
### Advanced Features
- Distribution chain leverages sophisticated, established access tools (ShadowPad and PlugX), indicating a multi-stage, targeted approach rather than widespread opportunistic infection.
## Indicators of Compromise
*Note: Specific IoCs for NailaoLocker are not provided in the context, but indicators related to its delivery tools would be relevant.*
- File Hashes: [Not specified]
- File Names: [Not specified, but ransomware often uses specific extensions or randomized names upon encryption]
- Registry Keys: [Not specified]
- Network Indicators: [Not specified, though C2 for ShadowPad/PlugX would be present.]
- Behavioral Indicators: [File system interaction indicative of mass encryption, modifications to system configuration for persistence.]
## Associated Threat Actors
- The threat actor group responsible is implicitly linked to those known to deploy **ShadowPad** and **PlugX**. The activity is noted as occurring in **Europe**.
## Detection Methods
- **Signature-based detection:** Signatures for the specific NailaoLocker binary payload.
- **Behavioral detection:** Monitoring for mass file encryption activity. Detection of known C2 communication patterns associated with ShadowPad or PlugX droppers/loaders.
- **YARA rules:** [Not specified]
## Mitigation Strategies
- **Prevention measures:** Robust endpoint protection capable of detecting ransomware behavior (e.g., EDR solutions). Patching/securing systems against initial access vectors that lead to ShadowPad/PlugX deployment.
- **Hardening recommendations:** Strict application control, network segmentation, and regular, offline patching.
## Related Tools/Techniques
- **PlugX:** A known modular backdoor often used for initial access and establishing persistence.
- **ShadowPad:** A highly modular and obfuscated backdoor often associated with advanced persistent threat (APT) groups.