{
  "family": "gupd",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\nGupd is a malicious Trojan (often functioning as a downloader or backdoor) that leverages social engineering by masquerading as a legitimate software update—frequently mimicking the \"Google Update\" (gupdate.exe) service or generic Windows updates. Its primary objective is to trick the user or the operating system into executing its payload, thereby establishing persistent, remote access for an attacker.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nGupd is heavily reliant on deceptive distribution. It is often served via compromised \"watering hole\" websites (where users are prompted to \"Update Chrome to view this content\"), malvertising, or bundled within pirated software.\n\nOnce executed, Gupd focuses on blending in with normal system operations:\n<ul>\n<li><strong>Process Masquerading:</strong> The malware renames its executable to `gupd.exe`, `gupdate.exe`, or `wuauclt.exe`. It often drops itself into legitimate-looking directories (like `C:\\ProgramData\\Google\\` or `%AppData%\\Microsoft\\`) to evade casual inspection by the user or basic antivirus heuristics.</li>\n<li><strong>Persistence via Scheduled Tasks:</strong> To ensure it runs automatically, Gupd frequently creates Windows Scheduled Tasks named \"GoogleUpdateTaskMachineUA\" or similar, ensuring the malicious code executes with system privileges every time the computer boots or a user logs in.</li>\n<li><strong>C2 Communication and Payload Delivery:</strong> Under the guise of checking for updates, Gupd establishes an outbound connection to an attacker-controlled server. This channel is then used to silently download and execute secondary payloads, such as banking trojans, cryptominers, or info-stealers.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nA Gupd infection is a severe security incident. By successfully masquerading as a trusted service, it bypasses user suspicion and often circumvents host-based firewalls that allow \"updater\" processes to communicate externally. Its presence indicates that secondary, highly destructive malware is likely already present on the system.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Network Isolation and Process Termination:</strong> Immediately isolate the host. Utilize Task Manager or EDR tools to identify the rogue updater process. Pay close attention to the file path; a legitimate Google update will not run from the user's `Temp` directory. Terminate the process.</li>\n<li><strong>Eradicate Persistence Mechanisms:</strong> Thoroughly audit Windows Scheduled Tasks and the Registry `Run` keys. Delete any tasks or keys pointing to the malicious executable.</li>\n<li><strong>Comprehensive System Sweep:</strong> Because Gupd acts as a downloader, eradicating the initial loader is insufficient. Run a full, deep scan with an enterprise EDR solution to hunt for and remove the secondary payloads (e.g., keyloggers or ransomware staging files) it likely deployed.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.Gupd",
    "FakeUpdate.Gupd",
    "Win32/Gupd"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1036.005",
    "T1053.005",
    "T1105"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-01T17:37:08Z",
  "type": "Trojan (Fake Update)",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}