{
  "family": "gibe",
  "sample_count": 1,
  "category": "advanced_threat",
  "description": "<h3>Executive Summary</h3>\nGibe (also known as Swen or Gibe.F) is a highly deceptive mass-mailing computer worm that gained notoriety in the early 2000s. It differentiates itself by aggressively employing social engineering, specifically masquerading as critical, official security updates from Microsoft. Its primary objective is rapid, widespread self-propagation to maximize the size of its botnet, which can then be utilized for distributed denial-of-service (DDoS) attacks or further malware deployment.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nGibe's primary vector is email. It arrives in user inboxes with forged sender addresses (often spoofing `admin@microsoft.com` or `security@microsoft.com`) and subject lines claiming to deliver a \"Newest Microsoft Security Update\" or \"Internet Explorer Patch.\"\n\nUpon the victim executing the attached file (often disguised as an `.exe`, `.pif`, or `.bat`), the worm activates:\n<ul>\n<li><strong>Deceptive Installation:</strong> Gibe often displays a highly convincing, fake graphical installation wizard mimicking a legitimate Windows update process. This keeps the user unaware while the worm silently installs itself in the background.</li>\n<li><strong>Mass Mailing (Self-Propagation):</strong> The worm immediately harvests email addresses from the local machine (scanning address books, temporary internet files, and local documents). It contains its own internal SMTP engine to blast out thousands of copies of itself to the harvested contacts.</li>\n<li><strong>Network Spreading:</strong> Beyond email, Gibe aggressively attempts to copy itself to open network shares (IPC$, C$) and peer-to-peer (P2P) file-sharing folders (like Kazaa or eMule directories) disguised as popular software or cracks.</li>\n<li><strong>Security Disabling:</strong> It actively attempts to terminate processes associated with popular antivirus and firewall software, leaving the machine vulnerable.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nWhile older, the *tactics* of Gibe (spoofing trusted authorities) remain highly relevant. An outbreak causes severe network congestion due to the massive volume of outbound SMTP traffic and rapid lateral movement attempts. The disabling of local security software leaves endpoints completely exposed to secondary infections.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Immediate Network and Port Blocking:</strong> Isolate infected subnets. Immediately block outbound SMTP traffic (Port 25) at the perimeter firewall for all unauthorized hosts to halt the mass-mailing propagation.</li>\n<li><strong>Malware Scanning and EDR:</strong> Deploy an enterprise-wide anti-malware sweep targeting the specific IoCs (hashes, file names) of the Gibe variant. Ensure EDR solutions are actively monitoring for attempts to disable security services.</li>\n<li><strong>Email Gateway Filtering:</strong> Update secure email gateways to filter out attachments utilizing the specific spoofed sender addresses and deceptive subject lines employed by the campaign.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "W32.Gibe",
    "Worm:Win32/Gibe",
    "Worm.Swen",
    "I-Worm.Gibe"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1566.001",
    "T1036.003",
    "T1562.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-02T07:10:57Z",
  "type": "Worm",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}