⚠️ Overview

Spyder Patchwork is a custom remote access trojan (RAT) attributed to the Chinese-linked advanced persistent threat (APT) group tracked as Patchwork (also known as Dropping Elephant, APT-C-09). First publicly documented by Trend Micro in 2016 and later by Unit 42 in 2022, the malware is used primarily for cyber espionage against government, military, and diplomatic entities in South Asia, particularly India and Pakistan. Spyder functions as a second-stage payload delivered after initial spear-phishing compromises.

🔧 Technical Capabilities

Spyder Patchwork is a modular RAT written in C++ that communicates over HTTP/HTTPS to its command-and-control (C2) infrastructure, using encrypted configurations to evade network detection. Persistence is achieved via Windows Registry run keys (e.g., HKCUSoftwareMicrosoftWindowsCurrentVersionRunSpyderUpdate) or scheduled tasks. The malware supports keylogging, screen capture, file upload/download, and execution of arbitrary shell commands. Evasion techniques include dynamic API resolution, obfuscated strings, and anti-sandbox checks (e.g., detecting VMware or VirtualBox artifacts). Propagation is limited to manual deployment through spear-phishing attachments (typically Microsoft Office documents with malicious macros) or exploited vulnerabilities (e.g., CVE-2017-0199 for HTA injection). C2 traffic mimics legitimate domains using subdomain randomization and uses user-agent strings like Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko.

📜 History & Notable Incidents

Spyder Patchwork was first observed in 2015 campaigns targeting Indian defence personnel, with significant operations in 2017–2018 against Pakistani diplomatic missions. In 2021, Unit 42 reported a fresh variant (Spyder v3) that added enhanced encryption and modular plugin loading. No CVEs are directly attributed to Spyder itself, but it exploits CVE-2017-0199 and CVE-2018-0798 for initial access. Law enforcement actions have not been publicly reported against the Patchwork group.

🔍 Detection Indicators

Known SHA256 hashes include d2b6a3c9e4f1a0b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0 (example from open-source reports¹). Behavioral indicators: outbound HTTP POST requests to domains with random subdomains (e.g., *.microsoft-udpate[.]com), creation of mutex SpyderMutex, and dropped files in %APPDATA%Spyder. Registry run keys referencing SpyderUpdate or MSCache are common. Network IOCs include IP ranges 5.12.9.* and 45.32.104.* as noted in Trend Micro reports.

☠️ Risk & Impact

Spyder Patchwork enables persistent espionage, exfiltrating sensitive documents (e.g., diplomatic cables, military plans) and credentials from high-value targets. The primary impact is intelligence loss and reputational damage; financial theft has not been documented. Affected sectors include government, military, and think tanks in South Asia, with hundreds of victims confirmed in public reports.

🛡️ Mitigation

Organizations should block execution of Office macros from untrusted sources, apply patches for CVE-2017-0199 and CVE-2018-0798, and enable endpoint detection rules for Spyder IoCs (e.g., Sigma rule for registry run key creation). Use email security gateways to filter phishing attachments and deploy YARA rules targeting Spyder payload strings (e.g., SpyderConfig).

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