{
  "family": "spora",
  "sample_count": 4,
  "category": "ransomware",
  "description": "Ransom:Win32/Spora is widely regarded by threat analysts as one of the most sophisticated, 'professionally' developed crypto-ransomware families of its era. It gained notoriety not just for its robust RSA/AES encryption, but for its highly polished, consumer-friendly payment portal that offered a menu of extortion options, treating the victim more like a customer than a target.<br><br><b>Understanding Spora (Professional Ransomware)</b><br>To an end-user, Spora presents a catastrophic loss of data, coupled with a surprisingly professional, multi-lingual web interface (accessed via a dropped `.HTA` file). Spora was unique because it didn't just demand a flat fee; it offered 'a la carte' services. Victims could pay a large fee for a full system decryptor, a smaller fee to decrypt specific files, or a very small fee just to 'remove the virus' (without decrypting the data). For an enterprise, Spora was highly dangerous because it worked entirely offline after initial execution, requiring no C2 communication to encrypt files.<br><br><b>Execution and Extortion Mechanics</b><br>Spora was typically distributed via massive malspam campaigns featuring malicious invoices (often ZIP files containing HTA or JavaScript downloaders) (`T1566.001`). It was also heavily distributed via compromised websites offering fake Chrome font updates (the HoeflerText lure) (`T1189`). Upon execution, it does not require internet access (`T1486`). It generates a unique RSA key pair locally, encrypts the local private key with a hardcoded master public key, and then encrypts user files (`.doc`, `.xls`, `.pdf`, `.zip`, etc.) using AES-256. It modifies the registry to establish persistence (`T1547.001`) and famously deletes Volume Shadow Copies to prevent easy recovery (`T1490`). It does not append a new extension to encrypted files, but it drops a `.HTA` file containing the ransom portal.<br><br><b>Indicators of Compromise & Impact</b><br>The impact is severe, immediate data loss. Host-based IoCs include EDR alerts for `vssadmin.exe` execution, massive disk I/O, and the sudden appearance of the `<User_ID>.html` or `<User_ID>.hta` ransom notes on the desktop and in every encrypted directory. Network IoCs are minimal during encryption, as Spora is designed to operate offline.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Spora and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Spora is classified as a Ransomware. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments."
      }
    },
    {
      "@type": "Question",
      "name": "How does Spora establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Spora typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks."
      }
    },
    {
      "@type": "Question",
      "name": "What are the essential incident response steps for mitigating a Spora compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Spora should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups."
      }
    },
    {
      "@type": "Question",
      "name": "What cryptographic algorithms and file targeting techniques does Spora employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Spora typically leverages hybrid cryptographic architectures combining symmetric stream or block ciphers (such as AES-256 or ChaCha20) for rapid file encryption with asymmetric algorithms (such as RSA-2048 or Curve25519) to securely protect the session keys. It aggressively targets sensitive file extensions including corporate documents, databases, virtual disks, and backups while systematically executing commands to delete Volume Shadow Copies (vssadmin delete shadows /all /quiet) and disable system recovery options."
      }
    },
    {
      "@type": "Question",
      "name": "Are decryptors available for Spora, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Spora depends on whether security researchers or law enforcement (such as the No More Ransom initiative) have recovered the master private keys or discovered flaws in its key generation routines. Victims should never pay the extortion demand, as payment fuels criminal operations without guaranteeing file restoration. The recommended recovery procedure entails isolating infected hosts, conducting forensic disk imaging, identifying the root access vector, and restoring validated systems from immutable offline backups."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1189",
    "T1566.001",
    "T1490",
    "T1486"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1486",
      "name": "Data Encrypted for Impact (Offline encryption)",
      "tactic": "Impact"
    },
    {
      "id": "T1490",
      "name": "Inhibit System Recovery (Deleting Shadow Copies)",
      "tactic": "Impact"
    },
    {
      "id": "T1566.001",
      "name": "Phishing: Spearphishing Attachment",
      "tactic": "Initial Access"
    },
    {
      "id": "T1189",
      "name": "Drive-by Compromise (Fake Font Updates)",
      "tactic": "Initial Access"
    }
  ],
  "containment_steps": [
    "Immediately physically disconnect the infected endpoint from the network to prevent the ransomware from traversing and encrypting SMB shares.",
    "Identify the initial delivery vector (e.g., the fake font update or specific phishing email) and purge it from the environment.",
    "Do NOT reboot the infected machine if possible; capture a live memory image (RAM dump).",
    "Restore the encrypted systems from secure, offline backups that were isolated from the network at the time of the attack."
  ],
  "what_to_avoid": [
    "Do not pay the ransom, even the 'smaller' fees offered by Spora's a la carte menu; it funds criminal operations and decryptors are never guaranteed.",
    "Avoid assuming a machine is safe just because it is disconnected from the internet; Spora does not require a C2 connection to destroy data."
  ],
  "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,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}