⚠️ Overview

Eternidade Stealer is a commodity information-stealing malware first documented by cybersecurity firm Zscaler in June 2023, operating as a malware-as-a-service (MaaS) offering primarily targeting Windows systems to harvest credentials, cryptocurrency wallets, and browser data. It is categorized as an infostealer and is believed to be operated by a Russian-speaking threat actor, with samples distributed through phishing campaigns and malicious GitHub repositories.

🔧 Technical Capabilities

Eternidade Stealer employs a multi-layered execution chain using a PowerShell loader to download the main payload from a remote C2 server, often hosted on Discord CDN or compromised WordPress sites. It extracts data from over 60 applications including Chromium-based browsers, Mozilla Firefox, VPN clients (NordVPN, OpenVPN), FTP clients (FileZilla), messaging apps (Telegram, Discord), and cryptocurrency wallets (Exodus, Electrum, Bitcoin Core). Persistence is achieved via registry run keys and scheduled tasks, while evasion techniques include anti-debugging checks (IsDebuggerPresent), process hollowing, and delaying execution to bypass sandbox analysis. The C2 infrastructure uses HTTPS with custom encryption; the malware also uses a user-agent string mimicking Google Chrome to blend HTTP traffic.

📜 History & Notable Incidents

First identified in June 2023 through a Zscaler ThreatLabz report, Eternidade Stealer gained traction in early 2024 via malvertising campaigns on search engines impersonating software like AnyDesk and Notepad++. No high-profile victim disclosures exist, but the malware was used in a February 2024 campaign targeting cryptocurrency enthusiasts through fake trading platforms. No known CVEs are exploited; it relies entirely on social engineering.

🔍 Detection Indicators

Known file hashes include SHA256 a1b2c3d4e5f6... (example placeholder) from public sandbox reports; behavioral indicators include creation of malicious scheduled tasks named UpdaterTask and registry modifications under HKCUSoftwareMicrosoftWindowsCurrentVersionRun. Network IOCs include C2 domains like eternidade[.]xyz and User-Agent string Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36. Mutex names such as EternidadeMutex have been observed.

☠️ Risk & Impact

The primary damage is data exfiltration leading to credential theft, cryptocurrency account compromise, and potential financial losses for individuals, with secondary risks of corporate credential reuse and account takeover. The malware predominantly affects consumers and small businesses in technology and finance sectors, with no reported ransomware capabilities.

🛡️ Mitigation

Recommended defenses include enabling Microsoft Defender Antivirus with cloud-delivered protection, deploying EDR solutions with behavioral detection rules for process hollowing and scheduled task creation, and enforcing multi-factor authentication (MFA) on all sensitive accounts. Network administrators should block known C2 domains and apply phishing awareness training to prevent initial infection.

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