Full Report
The newly identified SPECTRE implant represents an evolution in commodity intrusion tooling, integrating cross-platform C2 operations, process injection, credential theft, anti-analysis protections, and kernel-level endpoint detection and response (EDR) bypass functionality.
Analysis Summary
# Tool/Technique: SPECTRE
## Overview
SPECTRE is a sophisticated, cross-platform (Windows and Linux) backdoor and implant written in C. It is utilized by the Chinese-speaking threat actor UAT-10147 for post-exploitation activities. The tool represents a significant evolution in commodity intrusion tooling, integrating advanced defense evasion, kernel-level capabilities, and AI-assisted code generation for its Linux rootkit components.
## Technical Details
- **Type:** Malware Family / Cross-platform Backdoor
- **Platform:** Windows, Linux (IIS and Linux Servers)
- **Capabilities:** C2 operations, process injection, credential theft, anti-analysis, EDR bypass (BYOVD), and kernel-level persistence (Rootkit).
- **First Seen:** August 2026 (Reported date)
## MITRE ATT&CK Mapping
- **[TA0003 - Persistence]**
- [T1014 - Rootkit]
- [T1505.003 - Server Software Component: Web Shell]
- **[TA0005 - Defense Evasion]**
- [T1562.001 - Impair Defenses: Disable or Modify Tools] (EDR Bypass)
- [T1027 - Obfuscated Files or Information]
- [T1064 - Scripting]
- [T1497 - Virtualization/Sandbox Evasion]
- [T1055 - Process Injection]
- [T1068 - Exploitation for Privilege Escalation] (BYOVD)
- **[TA0006 - Credential Access]**
- [T1003 - OS Credential Dumping]
- **[TA0011 - Command and Control]**
- [T1071.001 - Application Layer Protocol: Web Protocols]
## Functionality
### Core Capabilities
- **Cross-Platform C2:** Unified command and control operations for both Windows and Linux environments.
- **Credential Theft:** Native modules for extracting sensitive information from compromised hosts.
- **Process Injection:** Capabilities to inject malicious code into legitimate processes to hide presence.
- **Persistence:** Utilization of web shells (ASHX) and kernel-level rootkits to maintain access to IIS and Linux servers.
### Advanced Features
- **BYOVD (Bring Your Own Vulnerable Driver):** Used to neutralize EDR and security software by operating at the kernel level.
- **Sophisticated Obfuscation:** Uses PEB hash walking (DJB2) for runtime API resolution and per-string **xorshift32 PRNG** encryption to prevent static analysis.
- **Anti-Analysis Scoring:** A weighted system that checks for sandboxes, RAM capacity, CPU count, and specific usernames. If the "score" exceeds 50, the malware self-terminates.
- **AI-Assisted Development:** Evidence suggests the use of Generative AI to accelerate the creation of the Linux kernel rootkit components.
- **SEO Fraud Integration:** Integrated features for monetizing compromised servers through search engine optimization fraud.
## Indicators of Compromise
*Note: The following are examples based on the provided context.*
- **File Names:** `demo.pdb`, `service.pdb`, `SPECTRE_debug.log`
- **Registry Keys:** Associated with "x神的自安装服务" (xshen's self-installing service).
- **Network Indicators:**
- HTTP Header: `X-ID` (used for web shell authentication).
- C2 Domains: [defanged_domain].com
- **Behavioral Indicators:**
- Execution of `xorshift32` decryption routines in thread local storage.
- Deployment of vulnerable drivers to bypass EDR.
- Deployment of `.ashx` web shells on IIS servers.
## Associated Threat Actors
- **UAT-10147:** A Chinese-speaking intrusion actor.
- **xshen (x神):** A developer/actor associated with the "BadIIS" ecosystem and SEO fraud utilities.
## Detection Methods
- **Signature-based detection:**
- ClamAV: `Win.Malware.BadIIS-10059985-0`, `Unix.Rootkit.Spectre-10060260-0`.
- **Behavioral detection:**
- Monitoring for unusual kernel driver loading (BYOVD).
- Tracking suspicious HTTP headers (`X-ID`) in IIS logs.
- Detecting runtime API resolution via PEB walking.
- **Network Defense:** Snort SIDs 66690, 66688, 66689.
## Mitigation Strategies
- **Endpoint Protection:** Use EDR solutions with robust driver-loading policies (e.g., Microsoft's vulnerable driver blocklist).
- **Server Hardening:** Regularly patch IIS and Linux servers; implement the principle of least privilege for web service accounts.
- **Web Application Firewall (WAF):** Monitor for and block suspicious `.ashx` or `.aspx` file uploads and unusual header traffic.
- **Audit Logging:** Enable detailed logging for process creation and kernel-level events.
## Related Tools/Techniques
- **BadIIS:** A malware ecosystem used for SEO fraud and server hijacking.
- **Noodle RAT:** A Linux backdoor used as a final stage payload.
- **QuasarRAT / Gh0stCringe:** Off-the-shelf RATs used for long-term persistence.
- **Potatoes (GodPotato, JuicyPotato):** Open-source offensive tools used for local privilege escalation.