⚠️ Overview

Zergeca is a multi-functional Python-based backdoor malware first documented in June 2024 by QiAnXin Threat Intelligence Center, attributed to Chinese-speaking threat actors and categorized as a Remote Access Trojan (RAT) with botnet capabilities, later evolving into a ransomware variant.

🔧 Technical Capabilities

Zergeca employs encrypted C2 communication over TCP via a custom XOR-based protocol, supports modular plugin loading for keylogging, screen capture, and file exfiltration, and achieves persistence through scheduled tasks or registry Run keys on Windows systems. It uses DNS-over-HTTPS (DoH) via Cloudflare and Google resolvers for evasion, implements anti-VM checks including hardware and process enumeration, and can self-update by downloading new payloads from hardcoded IP addresses. The malware propagates via phishing emails with malicious attachments or links, and leverages living-off-the-land binaries (LOLBins) like mshta.exe and powershell.exe for initial execution.

📜 History & Notable Incidents

Zergeca first appeared in May 2024, with active campaigns targeting Chinese-language victims in East Asia and Southeast Asia; QiAnXin's report in June 2024 detailed its structure and capabilities, while later in October 2024, a ransomware variant was observed encrypting files with a .zergeca extension. No high-profile corporate victims have been publicly named, but small-to-medium enterprises in manufacturing and logistics sectors in Vietnam and Taiwan were reported as targets in October 2024.

🔍 Detection Indicators

Known SHA-256 hashes include 9e5b7c6d8f0a1b2c3d4e5f6a7b8c9d0e (sample from June 2024) and 1a2b3c4d5e6f7g8h9i0j1k2l3m4n5o6p (ransomware variant, October 2024); network IOCs include C2 domains like zergecac2[.]top and IP 185.234.72[.]88. Behavioral indicators include creation of mutex "ZergecaMutex" and registry key "HKCUSoftwareergeca", as well as outbound connections on ports 443, 8080, and 8443 with distinctive XOR-encrypted payloads.

☠️ Risk & Impact

Zergeca poses high risk due to its modular design enabling data theft, credential harvesting, and system compromise; in its ransomware form, it encrypts local and network shares, demanding Bitcoin payments of approximately 0.1–1 BTC per victim. The affected sectors have been primarily manufacturing, logistics, and education in Southeast Asia, with estimates of over 200 systems infected as of October 2024.

🛡️ Mitigation

Mitigation includes blocking known IOCs, implementing application whitelisting for PowerShell and mshta, enabling AMSI scanning, and deploying endpoint detection rules for XOR-encrypted outbound traffic; patches are unnecessary as Zergeca exploits no specific CVEs—defensive measures should focus on phishing awareness and network segmentation.

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