{
  "family": "zdowbot",
  "sample_count": 1,
  "category": "trojan",
  "description": "<h3>Executive Summary</h3>\nZdowbot is a malicious Trojan designed to covertly infiltrate Windows systems, establish persistence, and conscript the endpoint into a larger Botnet. Once infected, the \"zombie\" computer is utilized by remote threat actors to participate in coordinated Distributed Denial of Service (DDoS) attacks, generate massive volumes of spam email, or serve as a proxy for further malicious activity.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nZdowbot is predominantly distributed through socially engineered spam campaigns containing malicious attachments (often weaponized PDFs or Office documents utilizing macro exploits) or via compromised software installers downloaded from untrustworthy web portals.\n\nUpon successful execution, Zdowbot operates with a focus on stealth and botnet participation:\n<ul>\n<li><strong>System Reconnaissance and C2 Registration:</strong> The trojan immediately collects system information and \"registers\" the new bot with a centralized command-and-control (C2) server, usually over IRC or HTTP.\n<li><strong>Persistence:</strong> Zdowbot ensures it survives system reboots by modifying the Windows Registry (e.g., adding entries to the `Run` or `RunOnce` keys) or by creating hidden Scheduled Tasks that execute the malware payload under high privileges.</li>\n<li><strong>Command Execution:</strong> The infected machine sits dormant, awaiting instructions from the botmaster. Upon command, Zdowbot can launch UDP/TCP floods against target IPs, download additional payloads (acting as a loader), or harvest local email addresses to propagate further spam.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nA Zdowbot infection represents a significant breach of the endpoint perimeter. Not only is the host's bandwidth and computing power being stolen for criminal enterprises, but the organization's IP address is highly likely to be blacklisted by external ISPs and security vendors due to the outbound malicious traffic.\n\n<h3>Remediation and Eradication</h3>\n<ul>\n<li><strong>Endpoint Detection and Response (EDR):</strong> Configure EDR solutions to monitor for anomalous registry modifications and unauthorized outbound network connections (especially IRC traffic) to unknown IP addresses.</li>\n<li><strong>Network Isolation and Sweeps:</strong> Immediately isolate the infected endpoint from the LAN. Conduct a thorough forensic sweep to identify not only the Zdowbot executable but also any secondary payloads it may have successfully deployed.</li>\n<li><strong>Perimeter Blocking:</strong> Analyze the botnet's C2 communication and block the associated IP addresses and domains at the corporate firewall to prevent further command execution.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.Zdowbot",
    "Botnet.Zdowbot",
    "Win32/Zdowbot"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1105",
    "T1547.001",
    "T1059",
    "T1498"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-02T06:44:44Z",
  "type": "Trojan / Botnet",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}