{
  "family": "bhosta",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\nBhosta 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.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nBhosta 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 web portals.\n\nUpon successful execution, Bhosta 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> Bhosta 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 upon user login.</li>\n<li><strong>Payload Delivery:</strong> Acting as a downloader, Bhosta receives instructions from the C2 server to download and execute secondary malware. This frequently includes info-stealers (to harvest credentials) or ransomware.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nA Bhosta 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 Bhosta executable but also any secondary payloads it may have successfully downloaded.</li>\n<li><strong>Credential Reset:</strong> Because Bhosta 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.Bhosta",
    "Downloader.Bhosta",
    "Win32/Bhosta"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1105",
    "T1547.001",
    "T1059"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-01T16:40:53Z",
  "type": "Trojan",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}