ValleyRAT (also known as ValleyRAT, Silver Fox) is a C++/Rust-based remote access trojan active since 2023. Chinese-origin RAT targeting Chinese speakers. Key capabilities include: shellcode injection, multi-stage loader, targets Chinese-speaking finance/accounting users.
Overview & Background
Chinese-origin RAT targeting Chinese speakers. First observed in 2023, ValleyRAT is attributed to Chinese eCrime. The malware is written in C++/Rust and provides operators with comprehensive remote access capabilities.
ValleyRAT continues to be actively distributed and used in campaigns targeting organizations worldwide. Its capabilities include: shellcode injection, multi-stage loader, targets Chinese-speaking finance/accounting users.
- Language: C++/Rust
- Active since: 2023
- Attribution: Chinese eCrime
- Also known as: ValleyRAT, Silver Fox
Technical Capabilities
- Shellcode Injection: Core ValleyRAT capability T1059
- Multi-Stage Loader: Core ValleyRAT capability T1059
- Targets Chinese-Speaking Finance/Accounting Users: Core ValleyRAT capability T1059
Distribution Methods
ValleyRAT is typically distributed through phishing emails with malicious attachments, cracked software downloads, and malvertising campaigns. Common delivery mechanisms include Office macros, ISO/IMG containers, and script-based downloaders.
- Phishing emails: Malicious attachments and links T1566.001
- Malvertising: SEO poisoning and malicious ads T1189
- Cracked software: Bundled with pirated applications
MITRE ATT&CK Mapping
| Tactic | Technique | Usage |
|---|---|---|
| Initial Access | T1566.001 Phishing Attachment | Malicious email attachments |
| Execution | T1204.002 Malicious File | User executes RAT payload |
| Persistence | T1547.001 Registry Run Keys | Autostart persistence |
| Defense Evasion | T1027 Obfuscated Files | Payload obfuscation |
| Credential Access | T1056.001 Keylogging | Keystroke capture |
| Collection | T1113 Screen Capture | Screenshot collection |
| Collection | T1125 Video Capture | Webcam access |
| C2 | T1071.001 Web Protocols | HTTP/HTTPS C2 communication |
Detection & Defense
- Endpoint detection: Monitor for C++/Rust processes with network connections from unusual locations
- Network monitoring: Detect C2 traffic patterns associated with ValleyRAT
- Email security: Block malicious attachments and links in phishing campaigns
- Application whitelisting: Restrict execution of unauthorized binaries
- YARA rules: Deploy detection signatures for known ValleyRAT variants
Protect Against Remote Access Trojans
Mjolnir Security provides comprehensive detection and response capabilities against ValleyRAT and similar RAT threats.
- RAT Detection & Removal Identify and remediate ValleyRAT infections including persistence mechanisms and lateral movement artifacts.
- Threat Intelligence Continuous monitoring for ValleyRAT campaigns and infrastructure targeting your organization.
- 24/7 Incident Response Rapid containment and forensic investigation. Call +1 833 403 5875.
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