{
  "family": "vkbase",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\nVKbase is a specialized Trojan and Adware family designed explicitly to target and abuse users of the VKontakte (VK) social media network, which is highly popular in Russia and Eastern Europe. The malware operates by hijacking user sessions, manipulating social media accounts for spam distribution, and covertly harvesting login credentials.\n\n<h3>Infection Vector and Exploitation Mechanics</h3>\nVKbase is typically distributed via deceptive software bundling, malicious browser extensions masquerading as \"VK music downloaders,\" or via targeted phishing campaigns distributed directly through the VK messaging platform.\n\nOnce active on a user's system, VKbase executes its specific abuse routines:\n<ul>\n<li><strong>Session Hijacking:</strong> The malware actively searches installed web browsers for active session cookies associated with `vk.com`. It utilizes these cookies to hijack the user's authenticated session without requiring their plaintext password.</li>\n<li><strong>Account Abuse and Spam:</strong> Once the session is hijacked, VKbase utilizes the victim's account to autonomously post malicious links, join specific groups to artificially inflate subscriber counts, and \"Like\" targeted content, acting as a pawn in a social media botnet.</li>\n<li><strong>Credential Harvesting:</strong> Many variants of VKbase also incorporate keylogging functionality or fake login overlays specifically designed to capture the user's plaintext VKontakte username and password if the session cookie expires.</li>\n</ul>\n\n<h3>Security and Privacy Implications</h3>\nWhile highly targeted at a specific platform, VKbase represents a significant threat to user privacy and account integrity. Compromised social media accounts are frequently utilized by threat actors to distribute more severe malware (like ransomware or info-stealers) to the victim's trusted network of friends and colleagues.\n\n<h3>Incident Response and Mitigation</h3>\n<ul>\n<li><strong>Session Revocation and Password Reset:</strong> The immediate priority is to log out of all active sessions from within the VKontakte security settings, completely invalidating the stolen session cookies. Following this, an immediate password reset is required.</li>\n<li><strong>Browser Remediation:</strong> Manually inspect all installed web browsers and forcefully remove any suspicious or unverified extensions, particularly those claiming to offer enhanced VK functionality.</li>\n<li><strong>Endpoint Scanning:</strong> Utilize an enterprise-grade endpoint security solution to perform a full system scan to remove the underlying VKbase executable and any persistence mechanisms it established in the Windows Registry.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.VKbase",
    "Adware.VKbase",
    "Spyware.VKbase"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1539",
    "T1555.003",
    "T1056"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-01T16:35:09Z",
  "type": "Trojan",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}