{
  "family": "cryptredol",
  "sample_count": 1,
  "category": "ransomware",
  "description": "Ransomware:Win32/Cryptredol is a destructive malware strain with a dual-impact payload: it functions primarily as ransomware, encrypting victim data (`T1486`), but often includes a secondary cryptomining component (`T1496`) designed to monetize the system's hardware resources while the victim decides whether to pay the ransom. This dual-pronged attack maximizes the attacker's return on investment.<br><br><b>Understanding Cryptredol (Ransom-Miner)</b><br>To an end-user, the infection is catastrophic. Files become inaccessible, appended with a random extension, and the computer's fans spin loudly as the hidden miner consumes all available CPU power. For an organization, it requires immediate network isolation to prevent the rapid lateral spread of the encryption routine.<br><br><b>Execution and Dual-Payload Mechanics</b><br>Cryptredol is typically delivered via exploit kits or weaponized RDP access. Upon execution, it first disables Volume Shadow Copies (`vssadmin.exe delete shadows`) (`T1490`) to prevent easy data recovery. It then drops a secondary payload (often a variant of XMRig) to begin mining Monero (`T1496`) in the background. Simultaneously, it rapidly traverses local drives and mapped network shares, utilizing strong algorithms like AES or RSA to encrypt files (`T1486`). A ransom note is dropped in every affected directory.<br><br><b>Indicators of Compromise & Impact</b><br>The impact is total loss of data availability combined with severe system resource degradation. Host-based IoCs include the sudden renaming of thousands of files, the presence of ransom notes, EDR alerts for rapid file modification operations, and persistent 100% CPU utilization by unknown processes. System logs will show the execution of commands designed to inhibit system recovery. Network IoCs include connections to cryptocurrency mining pools (Stratum protocol) and a brief burst of traffic to a C2 server to transmit the victim's unique encryption ID.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Cryptredol and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Cryptredol 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 Cryptredol establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Cryptredol 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 Cryptredol compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Cryptredol 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 Cryptredol employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Cryptredol 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 Cryptredol, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Cryptredol 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": [
    "T1496",
    "T1012",
    "T1486",
    "T1490"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1486",
      "name": "Data Encrypted for Impact (The core ransomware function)",
      "tactic": "Impact"
    },
    {
      "id": "T1496",
      "name": "Resource Hijacking (The secondary cryptomining function)",
      "tactic": "Impact"
    },
    {
      "id": "T1490",
      "name": "Inhibit System Recovery (Deleting Shadow Copies)",
      "tactic": "Impact"
    },
    {
      "id": "T1012",
      "name": "Query Registry (Identifying mounted drives and network shares to encrypt)",
      "tactic": "Discovery"
    }
  ],
  "containment_steps": [
    "Isolate the infected machine from the network immediately—pull the ethernet cable or disable the Wi-Fi adapter to stop the encryption from spreading to network shares.",
    "Do not immediately reboot the machine; if the encryption process is active, rebooting may finalize the damage or destroy volatile memory keys.",
    "Identify the initial infection vector (e.g., exposed RDP) to prevent further compromise.",
    "Restore operations from known-good, offline backups; paying the ransom is highly discouraged as it funds criminal enterprises."
  ],
  "what_to_avoid": [
    "Do not connect backup drives to the infected machine until it has been completely wiped and reimaged, as the ransomware will encrypt the backups.",
    "Avoid assuming the threat is just a miner based on CPU usage; always check for encrypted files and dropped ransom notes."
  ],
  "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"
  ]
}