{
  "family": "behav",
  "sample_count": 2,
  "category": "ransomware",
  "description": "Behav (classified in antivirus detection telemetry under designations including Ransom:Win32/Behav, Ransom.Win32.Behav, and Win32/Behav) is a crypto-ransomware designed to locate, encrypt, and hold hostage high-value user documents, database stores, and system files. Disseminated across enterprise networks and consumer workstations via social engineering, phishing attachments, malicious drive-by downloads, or weaponized software cracks, Behav 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 file system traversal, high-speed symmetric/asymmetric encryption, Volume Shadow Copy destruction via vssadmin, and extortion note display. 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": [
    "Ransom:Win32/Behav",
    "Ransom.Win32.Behav",
    "Win32/Behav"
  ],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Ransom:Win32/Behav?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Behav is a ransomware threat designed to infiltrate Windows systems and execute unauthorized operations without user consent."
      }
    },
    {
      "@type": "Question",
      "name": "How does Behav 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 Behav 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 Behav 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 Behav?",
      "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": [
    "T1486",
    "T1490",
    "T1489",
    "T1547.001",
    "T1083"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-16",
  "mitre_attack_detail": [
    {
      "id": "T1059.001",
      "name": "Command and Scripting Interpreter: PowerShell (A frequent trigger for behavioral alerts)",
      "tactic": "Execution"
    },
    {
      "id": "T1003.001",
      "name": "OS Credential Dumping: LSASS Memory (Behaviorally blocking access to credential stores)",
      "tactic": "Credential Access"
    },
    {
      "id": "T1490",
      "name": "Inhibit System Recovery (Behaviorally blocking the deletion of backups)",
      "tactic": "Impact"
    }
  ],
  "containment_steps": [
    "Immediately analyze the EDR telemetry to determine exactly what sequence of actions triggered the behavioral block.",
    "If the alert involves 'Living off the Land' binaries (e.g., PowerShell, WMI), investigate the parent process (e.g., an Office document) to find the initial infection vector.",
    "Isolate the machine if the behavioral alert indicates a near-miss of a severe attack (like ransomware execution or credential dumping).",
    "Extract any decoded scripts or command-line arguments to identify C2 infrastructure and block it enterprise-wide."
  ],
  "what_to_avoid": [
    "Do not ignore behavioral alerts simply because the involved executables (like `powershell.exe`) are legitimate; attackers rely on this assumption.",
    "Avoid treating behavioral blocks as 'job done'; you must investigate *how* the attacker managed to initiate that behavior on the endpoint."
  ],
  "target_industries": [
    "Healthcare",
    "Critical Infrastructure",
    "Enterprise"
  ],
  "motivation": "Financial Extortion",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "defense_evasion",
    "impact"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "sources": [
    {
      "name": "Microsoft Defender Threat Encyclopedia - Ransom:Win32/Behav",
      "url": "https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Ransom:Win32/Behav"
    },
    {
      "name": "Kaspersky Threat Intelligence - Ransom.Win32.Behav",
      "url": "https://threats.kaspersky.com/en/threat/"
    },
    {
      "name": "MITRE ATT&CK - Enterprise Techniques",
      "url": "https://attack.mitre.org/techniques/T1486/"
    }
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}