{
  "family": "tierry",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\nTierry is a malicious Trojan designed to covertly infiltrate Windows systems, establish persistence, and act as a reliable downloader for remote threat actors. It is frequently utilized in the initial stages of a cyberattack to gather system intelligence and facilitate the automated deployment of secondary, highly destructive malware payloads, such as ransomware.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nTierry is predominantly distributed through socially engineered spam campaigns containing malicious attachments (often weaponized PDFs or Office documents) or via compromised software installers downloaded from untrustworthy portals.\n\nUpon successful execution, Tierry operates with a focus on stealth and payload delivery:\n<ul>\n<li><strong>System Reconnaissance:</strong> The trojan immediately collects detailed system information, including the OS version, installed software, network configuration, and active antivirus solutions. This fingerprint is transmitted to a command-and-control (C2) server.</li>\n<li><strong>Persistence:</strong> Tierry ensures it survives system reboots by modifying the Windows Registry (e.g., adding entries to the `Run` key) or by dropping a shortcut into the Windows Startup folder.</li>\n<li><strong>Payload Delivery:</strong> Acting as a downloader, Tierry receives instructions from the C2 server to download and execute secondary malware. This frequently includes info-stealers (to harvest credentials), botnet agents, or ransomware.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nA Tierry infection represents a significant breach of the endpoint perimeter. Because it provides remote attackers with the ability to execute arbitrary code, a compromised machine can quickly be utilized to pivot laterally across the corporate network.\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 to unknown IP addresses.</li>\n<li><strong>Network Isolation and Sweeps:</strong> Immediately isolate the infected endpoint. Conduct a thorough forensic sweep to identify not only the Tierry executable but also any secondary payloads it may have successfully downloaded.</li>\n<li><strong>Credential Reset:</strong> Because Tierry often facilitates the deployment of info-stealers, all user credentials associated with the compromised endpoint should be treated as compromised and immediately reset.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.Tierry",
    "Downloader.Tierry",
    "Win32/Tierry"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1105",
    "T1547.001",
    "T1059"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-01T16:29:46Z",
  "type": "Trojan",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}