{
  "family": "peepviewer",
  "sample_count": 1,
  "category": "trojan",
  "description": "<h3>Executive Summary</h3>\nPeepViewer (often detected as HackTool.PeepViewer or Spyware.VNC) is a specialized utility designed to secretly monitor and control remote desktops. While it utilizes the legitimate VNC (Virtual Network Computing) protocol, PeepViewer is specifically engineered for stealth, allowing an attacker to view the victim's screen and interact with their system without triggering any visible notifications or tray icons on the compromised host. It is heavily utilized by cybercriminals for post-compromise espionage and manual data exfiltration.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nPeepViewer is not typically self-replicating. It is manually deployed by an attacker who has already gained initial access to a system (e.g., via a spear-phishing payload, RDP brute-forcing, or as a secondary payload dropped by an initial Trojan).\n\nUpon execution, it provides severe surveillance capabilities:\n<ul>\n<li><strong>Stealth VNC Server:</strong> It installs a highly modified, hidden VNC server on the victim's machine. It suppresses the standard VNC notification tray icons and disables desktop wallpaper to improve transmission speeds, making its presence nearly invisible to the end user.</li>\n<li><strong>Reverse Connection:</strong> To bypass inbound firewall rules and NAT (Network Address Translation), the PeepViewer server often initiates a reverse connection out to the attacker's listening client (C2 server).</li>\n<li><strong>Interactive Control:</strong> Once connected, the attacker has full, real-time, graphical control over the victim's desktop. They can observe the user entering passwords, manually navigate the file system to steal sensitive documents, or execute administrative commands.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nThe detection of a stealth VNC tool like PeepViewer is a critical security incident. It signifies that a human attacker has active, real-time, interactive control over the endpoint. This level of access guarantees the compromise of any data stored on or accessed from that machine.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Immediate Network Isolation:</strong> The highest priority is to sever the attacker's interactive connection by instantly disconnecting the infected endpoint from the LAN and the internet. Do not simply turn it off, as volatile memory contains the attacker's active IP address.</li>\n<li><strong>Identify the Initial Vector:</strong> The presence of PeepViewer means perimeter defenses failed earlier. Utilize EDR telemetry to trace backwards from the PeepViewer execution to identify how the attacker initially gained access (e.g., finding the original dropper Trojan or compromised RDP logs).</li>\n<li><strong>Mandatory Re-imaging and Credential Reset:</strong> Because the attacker had interactive desktop access, attempting to \"clean\" the machine is insecure. The system must be wiped and re-imaged from a known-good baseline, and a mandatory global password reset is required for the user.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "HackTool.PeepViewer",
    "Spyware.VNC",
    "Backdoor.StealthVNC",
    "Tool.RemoteAdmin"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1056.001",
    "T1055",
    "T1090"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-02T07:34:37Z",
  "type": "HackTool / Spyware (Remote Access)",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}