{
  "family": "beastdoor",
  "sample_count": 1,
  "category": "backdoor",
  "description": "Beastdoor (classified in antivirus detection telemetry under designations including Backdoor:Win32/Beastdoor, Backdoor.Win32.Beastdoor, and Win32/Beastdoor) is a interactive remote access trojan and backdoor providing remote threat actors with unauthorized terminal control, file manipulation, and surveillance. Disseminated across enterprise networks and consumer workstations via social engineering, phishing attachments, malicious drive-by downloads, or weaponized software cracks, Beastdoor executes an initial reconnaissance phase upon system ingress. The binary evaluates host privileges, detects active hypervisors and sandbox environments to evade behavioral analysis, and establishes resilient autostart persistence by configuring registry keys under HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run or registering background Windows services. Operational mechanics characteristic of this family include reverse shell connections, process hollowing, privilege escalation, and lateral movement reconnaissance. Outbound communication is established with remote threat actor infrastructure to beacon operational status and receive tasking, posing significant security risks to data integrity and host availability.",
  "cta": "Published by the SystemHelpdesk Threat Intelligence Team.",
  "aliases": [
    "Backdoor.Beast",
    "Trojan.Beastdoor",
    "BDS/Beast",
    "Backdoor:Win32/Beastdoor",
    "Backdoor.Win32.Beastdoor",
    "Win32/Beastdoor"
  ],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Backdoor:Win32/Beastdoor?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Beastdoor is a backdoor threat designed to infiltrate Windows systems and execute unauthorized operations without user consent."
      }
    },
    {
      "@type": "Question",
      "name": "How does Beastdoor compromise target systems?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It commonly infiltrates systems via phishing emails, trojanized software installers, exploit kits, or unpatched vulnerabilities."
      }
    },
    {
      "@type": "Question",
      "name": "What persistence mechanisms does Beastdoor utilize?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It typically creates autostart entries in the Windows Registry (HKCU/HKLM Run keys), registers scheduled tasks, or installs hidden background services."
      }
    },
    {
      "@type": "Question",
      "name": "What risks does Beastdoor pose to an enterprise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It can lead to credential theft, system manipulation, unauthorized remote access, data loss, or secondary malware delivery."
      }
    },
    {
      "@type": "Question",
      "name": "How can administrators detect and eliminate Beastdoor?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Deploy modern EDR solutions with updated behavioral signatures, isolate infected endpoints, audit autostart persistence entries, and conduct full antimalware scans."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1059.003",
    "T1055",
    "T1573",
    "T1547.001",
    "T1070"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-16",
  "type": "RAT / Backdoor",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "mitre_attack_detail": [
    {
      "id": "T1059",
      "name": "Command and Scripting Interpreter",
      "tactic": "Execution"
    },
    {
      "id": "T1055.001",
      "name": "Dynamic-link Library Injection",
      "tactic": "defense-evasion"
    },
    {
      "id": "T1056.001",
      "name": "Keylogging",
      "tactic": "Credential Access"
    },
    {
      "id": "T1113",
      "name": "Screen Capture",
      "tactic": "Collection"
    }
  ],
  "containment_steps": [
    "Sever network connectivity for the flagged endpoint to terminate persistent command-and-control (C2) communication channels and stop Beastdoor from retrieving secondary stage payloads.",
    "Capture process memory triage to detect and terminate malicious threads injected by Beastdoor into legitimate system processes such as explorer.exe or svchost.exe.",
    "Audit Windows Registry Run keys (HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run) and Task Scheduler entries to locate and purge Beastdoor persistence hooks.",
    "Deploy updated enterprise EDR detection signatures and conduct an out-of-band endpoint scan to isolate dropped binaries and staged payloads.",
    "Rotate all credentials, domain user passwords, and session cookies active on the system during the Beastdoor execution timeframe."
  ],
  "what_to_avoid": [
    "Do not assume the incident is resolved simply because an antivirus tool removed the initial Beastdoor dropper; always verify that secondary payloads and persistence hooks have been eradicated.",
    "Avoid logging in with Domain Admin or privileged credentials on a machine suspected of running Beastdoor until memory triage is complete.",
    "Do not delay host isolation; automated lateral movement and credential dumping can occur within minutes of initial execution."
  ],
  "sources": [
    {
      "name": "Microsoft Defender Threat Encyclopedia - Backdoor:Win32/Beastdoor",
      "url": "https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Backdoor:Win32/Beastdoor"
    },
    {
      "name": "Kaspersky Threat Intelligence - Backdoor.Win32.Beastdoor",
      "url": "https://threats.kaspersky.com/en/threat/"
    },
    {
      "name": "MITRE ATT&CK - Enterprise Techniques",
      "url": "https://attack.mitre.org/techniques/T1059.003/"
    }
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}