{
  "family": "cussteel",
  "sample_count": 1,
  "category": "advanced_threat",
  "description": "<h3>Executive Summary</h3>\nCussteel is a malicious Information Stealer (Info-stealer) designed to covertly infiltrate Windows systems and harvest highly sensitive data. The name \"Cussteel\" often implies a specialized focus on stealing \"Customer\" data or specific enterprise credentials, making it a severe threat to corporate confidentiality and customer privacy.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nCussteel is typically distributed via targeted spear-phishing campaigns (often disguised as invoices, customer complaints, or shipping manifests) containing weaponized Office documents, or via drive-by downloads from compromised websites.\n\nUpon successful execution, the malware operates with a focus on comprehensive data harvesting:\n<ul>\n<li><strong>Credential Theft:</strong> The primary function of Cussteel is to silently harvest passwords. It actively queries the local databases of major web browsers (Chrome, Firefox, Edge) to extract saved passwords and session cookies. It also targets FTP clients, VPN configurations, and email applications (like Outlook).</li>\n<li><strong>Keylogging and Screen Capture:</strong> To capture data not stored on disk, the malware frequently implements a keylogger to record every keystroke entered by the user. It may also take periodic screenshots of the desktop or record video when specific applications (like banking portals) are in focus.</li>\n<li><strong>Data Exfiltration:</strong> The harvested intelligence is securely packaged, encrypted, and transmitted to a command-and-control (C2) server, providing the attacker with the exact credentials needed to escalate their access.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nA Cussteel infection represents a critical breach of confidentiality. Because it actively harvests credentials, a single compromised machine can provide attackers with the usernames and passwords required to bypass VPNs, access corporate email, and pivot laterally across the network.\n\n<h3>Remediation and Eradication</h3>\n<ul>\n<li><strong>Network Isolation:</strong> Immediately isolate the infected endpoint from the LAN to halt the active exfiltration of sensitive data to the attacker's C2 server.</li>\n<li><strong>Global Credential Reset:</strong> Assume all credentials utilized on the infected machine, as well as any cached network credentials, have been stolen. Force an immediate reset of all associated passwords from a known-secure device.</li>\n<li><strong>Endpoint Sweeps:</strong> Conduct a thorough forensic sweep using enterprise EDR tools to identify the Cussteel executable, its persistence mechanisms in the registry, and any dropped files.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.PWS.Cussteel",
    "Spyware.Cussteel",
    "Win32/Cussteel"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1056.001",
    "T1555",
    "T1113",
    "T1059"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-01T17:23:59Z",
  "type": "Information Stealer",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}