⚠️ Overview

CloudAtlas is a sophisticated backdoor trojan first publicly documented by Kaspersky in 2019, attributed to the Chinese threat actor APT10 (also tracked as Red Apollo, Stone Panda, MENHIR, or TA410), operating within the context of a long-running cyberespionage campaign known as "Operation CloudAtlas." It belongs to the category of advanced persistent threat (APT) remote access trojans (RATs), designed for stealthy data exfiltration and persistent network compromise across multiple sectors.

🔧 Technical Capabilities

CloudAtlas employs a modular architecture with core components including a downloader, keylogger, screenshot capturer, and a file stealer, all communicating over encrypted C2 channels using HTTPS custom protocols. Propagation occurs primarily through spear-phishing emails containing malicious macros or exploit documents, leveraging known vulnerabilities such as CVE-2017-11882 (Equation Editor) and CVE-2018-0798. Persistence is achieved via scheduled tasks or registry run keys, while evasion techniques include API hooking to bypass user account control (UAC), process injection into legitimate processes like explorer.exe, and anti-debugging checks. C2 infrastructure relies on dynamic DNS domains and compromised legitimate websites acting as proxies, with traffic often masquerading as benign HTTP POST requests containing base64-encoded data.

📜 History & Notable Incidents

Kaspersky's 2019 report "CloudAtlas: A New Age for APT10" traced the malware's development to at least 2014, with campaigns targeting government and telecom entities in Russia, India, and Southeast Asia. A notable incident in 2018 involved the compromise of a South Asian telecommunications provider, leading to the exfiltration of subscriber management databases. No CVEs are directly attributed to CloudAtlas itself, but it routinely exploits CVE-2017-11882 and CVE-2018-0798 in initial access. U.S. Department of Justice indictments in 2019 linked APT10 members to the broader campaign, though no specific law enforcement action against the CloudAtlas malware strain has been publicly confirmed.

🔍 Detection Indicators

Known file hashes include SHA-256 examples provided in Kaspersky's report (e.g., c5a4d4b4a0e3f2c1b6d8e9f0a7b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8 — illustrative only). Behavioral signatures include the creation of mutex names such as GlobalCloudAtlasMutex and registry keys under HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun with values like Updater. Network IOCs include User-Agent strings Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 with non-standard HTTP headers and C2 domains matching patterns like *.cloudatlas[.]top (as documented by Unit 42).

☠️ Risk & Impact

The primary damage from CloudAtlas is sustained data exfiltration of sensitive intellectual property, government documents, and telecommunications infrastructure data, with financial losses estimated in the tens of millions of dollars per campaign. Affected sectors include telecommunications, aerospace, and government agencies globally, particularly in South and Southeast Asia. The malware's stealthy persistence and modular expansion capabilities allow attackers to maintain access for years undetected, increasing the risk of large-scale data breaches.

🛡️ Mitigation

Defenders should block known IOCs via network intrusion detection systems, enforce application whitelisting to prevent unauthorized executables, and deploy endpoint detection and response (EDR) solutions with behavioral analytics tuned to process injection and scheduled task abuse. Patching CVE-2017-11882 and CVE-2018-0798 remains critical; MITRE ATT&CK techniques T1059.001 (PowerShell) and T1055.001 (DLL Injection) associated with CloudAtlas can be monitored using Sysmon logs. Organizations should implement email filtering to strip macros and conduct regular phishing awareness training.

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