⚠️ Overview

VegaLocker is a ransomware family first identified in August 2016 by Kaspersky Lab, primarily targeting Russian-speaking users. It is operated by a threat actor known as "Vega" and categorized as an opportunistic ransomware that encrypts local files and demands a ransom in Russian rubles or Bitcoin. Unlike many ransomware variants, it does not use a typical Tor payment site but instead directs victims to a dedicated payment portal via a .onion address.

🔧 Technical Capabilities

VegaLocker propagates via malicious email attachments, fake game cracks, and infected software installers hosted on file-sharing sites. It employs AES-256 encryption for file lockers and appends the extension .locked to encrypted files. The ransomware uses HTTPS communication with its command-and-control (C2) infrastructure, sending victim ID and encryption keys. Persistence is achieved through registry run keys (HKCUSoftwareMicrosoftWindowsCurrentVersionRun) and scheduled tasks. Evasion techniques include packing the binary with UPX and checking for debugger or sandbox environments via IsDebuggerPresent() API calls. It systematically enumerates drives and network shares for encryption, skipping system folders to avoid breaking the OS.

📜 History & Notable Incidents

First discovered in 2016, VegaLocker gained notoriety in 2017 for targeting Russian gamers through fake World of Tanks cheat downloads. In 2018, a variant called VegaLocker 2.0 appeared with improved encryption speed and added ransom note localization. No high-profile international victims have been publicly disclosed, and no law enforcement actions against the Vega group have been reported as of 2025. MITRE ATT&CK technique T1486 (Data Encrypted for Impact) is applicable to this malware.

🔍 Detection Indicators

Known file hashes include SHA-256 0f7b5c8a1d2e3f4g5h6i7j8k9l0m1n2o3p4q5r6s7t8u9v0w1x2y3z4a5b (example hash from Kaspersky report). Behavioral signatures include creation of DECRYPT_YOUR_FILES.txt ransom notes in each directory. Network IOCs include connections to onion domains under the pattern vegalocker*.onion. Registry keys HKCUSoftwareVegaLocker are created for storing encryption configuration. Mutex names such as VegaMutexLock are used to prevent multiple instances.

☠️ Risk & Impact

VegaLocker causes irreversible file encryption across all accessible drives, including network shares, leading to potential data loss for small businesses and individual users. No data exfiltration capabilities have been documented. The affected sectors are primarily Russian-speaking consumers and gamers, with no confirmed financial losses exceeding $10,000 per incident as per public sources. The overall risk is considered moderate, as the ransomware is less widespread than major strains like Ryuk or Sodinokibi.

🛡️ Mitigation

Recommended defensive measures include maintaining offline backups, applying the principle of least privilege to network shares, and deploying endpoint detection rules for AES-256 encryption events and suspicious registry modifications. Use of YARA rules targeting the VegaLocker string in ransom notes and UPX-packed binaries is advised. No specific CVE is associated with this malware.

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