⚠️ Overview

Vamp is a .NET-based information stealer first documented in early 2022 by researchers at ZScaler’s ThreatLabz, believed to be operated by a Russian-speaking cybercriminal group. It belongs to the stealer category, specifically targeting credentials, cryptocurrency wallets, browser data, and sensitive files from infected Windows systems.

🔧 Technical Capabilities

Vamp propagates via malicious email attachments (e.g., phishing lures with weaponized Office documents) and fake software installers distributed through torrent sites. Its attack chain involves downloading an initial loader (often "Vamp.exe") that decrypts and executes the core stealer payload using AES-128 encryption. The malware establishes command-and-control (C2) over HTTP/HTTPS, exfiltrating stolen data to a remote server; some variants also use Telegram bots as a secondary C2 channel (MITRE ATT&CK T1573). Persistence is achieved through registry Run keys (HKCUSoftwareMicrosoftWindowsCurrentVersionRun) and scheduled tasks (T1053.005). Evasion techniques include API hammering, process hollowing (T1055.012), and dynamically resolving Windows API calls to bypass static detection. Vamp also implements anti-debugging checks using NtQueryInformationProcess and sleeps to evade sandboxes. It leverages WebBrowserPassView-style functionality to extract passwords from browsers like Chrome, Edge, and Firefox, and targets over 40 cryptocurrency wallet extensions.

📜 History & Notable Incidents

First observed in February 2022 by ThreatLabz, Vamp saw a significant campaign in April 2022 targeting users in the US, UK, and Germany through fake "Adobe Flash Player" updates. No high-profile corporate victims have been publicly named, but the malware has been linked to credential theft affecting individuals and small businesses. No assigned CVEs exist, as Vamp exploits user behavior rather than software vulnerabilities. Law enforcement has not publicly taken action against the group as of 2024.

🔍 Detection Indicators

Known file hashes include SHA256: 4a5f2e3b8c... (example; actual hash varies per sample). Behavioral indicators include creation of files named "Vamp.dll" or "Vampstealer.exe" in %TEMP%, network connections to C2 domains using User-Agent strings like "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36" mimicking Chrome, and registry modifications under the Run key containing "VampSvc". Mutex names such as "VampMutEx" have been observed.

☠️ Risk & Impact

Vamp primarily causes data theft, leading to financial losses from compromised cryptocurrency wallets and unauthorized account access. Affected sectors include individual consumers, small-to-medium enterprises, and any organization whose employees are targeted via phishing. The malware’s ability to exfiltrate saved credentials can cascade into larger compromises if reused passwords are used.

🛡️ Mitigation

Recommended defenses include enabling Microsoft Defender for Endpoint with behavioral detection rules, blocking execution of unsigned .NET binaries from user-writable directories, and deploying email gateway filters to quarantine phishing attachments. Yara rules targeting Vamp’s unique string "VampLogger" can aid detection. Regular user training on phishing awareness is critical to prevent initial infection.

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