{
  "family": "0y1a48lx2yib",
  "sample_count": 1,
  "category": "ransomware",
  "description": "0Y1A48Lx2Yib (classified in antivirus detection telemetry under designations including Ransom:Win32/0Y1A48Lx2Yib, Ransom.Win32.0Y1A48Lx2Yib, and Win32/0Y1A48Lx2Yib) 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, 0Y1A48Lx2Yib 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:Win32/0Y1A48Lx2Yib",
    "Ransom.Win32.0Y1A48Lx2Yib",
    "Win32/0Y1A48Lx2Yib"
  ],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Ransom:Win32/0Y1A48Lx2Yib?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "0Y1A48Lx2Yib is a ransomware threat designed to infiltrate Windows systems and execute unauthorized operations without user consent."
      }
    },
    {
      "@type": "Question",
      "name": "How does 0Y1A48Lx2Yib 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 0Y1A48Lx2Yib 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 0Y1A48Lx2Yib 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 0Y1A48Lx2Yib?",
      "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": "2026-10-15",
  "mitre_attack_detail": [
    {
      "id": "T1027",
      "name": "Obfuscated Files or Information (Polymorphism used to evade static signatures)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1568.002",
      "name": "Dynamic Resolution: Domain Generation Algorithms (DGA) (Evading C2 blacklisting)",
      "tactic": "Command and Control"
    },
    {
      "id": "T1055",
      "name": "Process Injection (Hiding the unpacked, malicious code inside legitimate processes)",
      "tactic": "Defense Evasion"
    }
  ],
  "containment_steps": [
    "Isolate the endpoint immediately; polymorphic droppers are typically the first stage of a much larger attack sequence.",
    "Rely on EDR behavioral rules (e.g., blocking suspicious process injections) rather than relying on the AV signature that caught this specific variant.",
    "Analyze DNS logs for the infected host to identify the algorithm used by the DGA, and block the successful connections.",
    "Submit the memory dump or the quarantined file to a dynamic sandbox to identify the *actual* payload it was attempting to deploy."
  ],
  "what_to_avoid": [
    "Do not waste time searching the enterprise for the specific file hash associated with '0y1a48lx2yib'; it is likely unique to that single machine.",
    "Avoid trying to manually block every domain generated by a DGA; the attacker can generate them faster than you can block them."
  ],
  "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:Win32/0Y1A48Lx2Yib",
      "url": "https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Ransom:Win32/0Y1A48Lx2Yib"
    },
    {
      "name": "Kaspersky Threat Intelligence - Ransom.Win32.0Y1A48Lx2Yib",
      "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"
  ]
}