{
  "family": "blihan",
  "sample_count": 20,
  "category": "ransomware",
  "description": "Blihan (classified in endpoint telemetry as Ransom:Win32/Blihan, Trojan-Ransom.Win32.Blihan, and Win32/Blihan) is an aggressive crypto-ransomware family designed to extort Windows organizations and individual users. Distributed through spearphishing email campaigns, malicious office macros, and fake software installers, Blihan initiates rapid directory traversal upon execution. It targets high-value user data, including financial spreadsheets, contracts, databases, and system backups, locking them with robust symmetric and asymmetric encryption algorithms (such as AES paired with RSA). Blihan appends a unique extension (such as .blihan) to encrypted files, executes vssadmin delete shadows /all /quiet to purge Volume Shadow Copies, and deposits ransom notes detailing payment instructions in Bitcoin or Monero.",
  "cta": "Published by the SystemHelpdesk Threat Intelligence Team.",
  "aliases": [
    "Ransom:Win32/Blihan",
    "Trojan-Ransom.Win32.Blihan",
    "Win32/Blihan",
    "Ransom.Blihan",
    "Ransom:Win32/Blihan.A"
  ],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Ransom:Win32/Blihan?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Blihan is a crypto-ransomware family that encrypts files on Windows systems using AES and RSA, demanding cryptocurrency ransom."
      }
    },
    {
      "@type": "Question",
      "name": "How does Blihan prevent victims from restoring files from shadow copies?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It executes vssadmin delete shadows /all /quiet to silently delete Volume Shadow Copies."
      }
    },
    {
      "@type": "Question",
      "name": "What files are targeted by Blihan ransomware?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It targets office documents, spreadsheets, SQL databases, email archives, and backup image files."
      }
    },
    {
      "@type": "Question",
      "name": "How is Blihan delivered to victim machines?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It is delivered through malicious email attachments, weaponized macros, and Trojanized software installers."
      }
    },
    {
      "@type": "Question",
      "name": "How can organizations recover from a Blihan attack?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Isolate the network immediately, disinfect affected machines, and restore files from clean, offline backups."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1486",
    "T1490",
    "T1566.001",
    "T1083",
    "T1070.004"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-15",
  "sources": [
    {
      "name": "Microsoft Defender Threat Encyclopedia - Ransom:Win32/Blihan",
      "url": "https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Ransom:Win32/Blihan"
    },
    {
      "name": "Trend Micro Threat Encyclopedia - Ransom_Blihan",
      "url": "https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/ransom_blihan"
    },
    {
      "name": "Kaspersky Threat Intelligence Portal - Trojan-Ransom.Win32.Blihan",
      "url": "https://threats.kaspersky.com/en/threat/Trojan-Ransom.Win32.Blihan"
    }
  ],
  "mitre_attack_detail": [
    {
      "id": "T1486",
      "name": "Data Encrypted for Impact",
      "tactic": "Impact"
    },
    {
      "id": "T1490",
      "name": "Inhibit System Recovery",
      "tactic": "Impact"
    },
    {
      "id": "T1566.001",
      "name": "Phishing: Spearphishing Attachment",
      "tactic": "Initial Access"
    },
    {
      "id": "T1083",
      "name": "File and Directory Discovery",
      "tactic": "Discovery"
    },
    {
      "id": "T1070.004",
      "name": "Indicator Removal: File Deletion",
      "tactic": "Defense Evasion"
    }
  ],
  "containment_steps": [
    "Disconnect the affected host from network segments immediately to prevent encryption spreading across shares.",
    "Kill active ransomware processes using Task Manager or elevated PowerShell commands.",
    "Capture memory dumps and binary samples for malware analysis and IOC attribution.",
    "Block delivery domains and malicious sender email addresses at perimeter firewalls.",
    "Restore files from air-gapped, immutable backup archives."
  ],
  "what_to_avoid": [
    "Do not pay the cryptocurrency ransom demand; it funds cybercrime without guaranteeing decryption key delivery.",
    "Do not connect backup storage media to affected computers before ensuring the system is clean."
  ],
  "target_industries": [
    "Manufacturing",
    "Healthcare",
    "Retail",
    "Commercial Businesses"
  ],
  "target_geographies": [
    "Global"
  ],
  "threat_actors": [
    "Financially Motivated Ransomware Actors"
  ],
  "attack_stage": [
    "initial_access",
    "execution",
    "impact"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "motivation": "Financial Extortion & Ransom Payments",
  "sample_hashes": [],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}