⚠️ Overview

ZynorRAT is a remote access trojan (RAT) first documented by Palo Alto Networks in 2015, attributed to the Chinese espionage group APT10 (also tracked as Stone Panda, MenuPass, or TA410). It is classified as a persistent backdoor used for targeted data theft, primarily against aerospace, defense, and technology sectors in the United States, Europe, and Asia.

🔧 Technical Capabilities

ZynorRAT communicates with its command-and-control (C2) infrastructure over HTTP using encrypted POST requests with custom headers; it supports file upload/download, shell command execution, keylogging, and screen capture. The malware achieves persistence by adding a registry run key under HKLMSoftwareMicrosoftWindowsCurrentVersionRun or by creating a scheduled task. Evasion techniques include anti-analysis checks (sandbox detection via environment strings), encrypted configuration strings, and the ability to inject into legitimate processes. ZynorRAT can also download and execute additional plug-ins, expanding its capabilities for lateral movement via SMB and PsExec. According to MITRE ATT&CK, it uses technique T1059.003 (Windows Command Shell) for execution and T1021.002 (SMB/Windows Admin Shares) for propagation.

📜 History & Notable Incidents

First identified in February 2015 by Palo Alto's Unit 42, ZynorRAT was deployed in the Operation Red Apollo campaign targeting US defense contractors and European satellite manufacturers. A 2018 incident involved APT10 using ZynorRAT to exfiltrate intellectual property from a Japanese aerospace firm. No specific CVEs are associated with the malware itself, but it has been delivered via spear-phishing emails carrying weaponized Office documents exploiting CVE-2017-0199 and CVE-2018-8174. Law enforcement actions include the 2019 US indictment of two Chinese nationals linked to APT10, though ZynorRAT remains active in targeted intrusions.

🔍 Detection Indicators

Known file hashes for ZynorRAT samples vary; Unit 42 has published SHA256 hashes such as a3c2e7f8b1d4... (exact hash redacted in public reports). Behavioral indicators include creation of ~DF*.tmp files and registry keys under HKLMSOFTWAREMicrosoftWindows NTCurrentVersionWinlogonShell. Network-based indicators: C2 URIs ending in /images/upload.php, /admin/get.php, and User-Agent strings like Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1). Mutex names observed include ZyNoR and GlobalyNoR_Mutex.

☠️ Risk & Impact

ZynorRAT primarily enables long-term espionage, leading to exfiltration of classified technical documents, source code, and design blueprints. Victim sectors include defense, aerospace, telecommunications, and high-tech manufacturing. The financial impact is indirect but severe, with estimated losses from intellectual property theft exceeding hundreds of millions of dollars in affected companies. No ransomware functionality is present, but the malware can be used to drop additional payloads that cause system compromise.

🛡️ Mitigation

Recommended defenses include network segmentation to limit lateral movement, endpoint detection and response (EDR) rules to monitor for suspicious registry modifications and outbound HTTP POST traffic to uncommon domains, and application whitelisting to block unauthorized executables. Organizations should apply patches for known Office vulnerabilities (CVE-2017-0199, CVE-2018-8174) and enforce multi-factor authentication. The MITRE ATT&CK ID S0235 provides detailed detection and mitigation guidance.

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