{
  "family": "kryptpck",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\nKryptpck (often a variant identifier for Cryptolocker-style ransomware or generic heavily packed ransomware) is a highly destructive malware family engineered for rapid financial extortion. Operating as a Cryptovirus, Kryptpck infiltrates Windows systems, utilizes strong, unbreakable military-grade encryption algorithms to lock down the victim's critical data, and demands a ransom payment (usually in cryptocurrency) in exchange for the decryption key.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nKryptpck is predominantly distributed via highly targeted spear-phishing campaigns containing weaponized Office documents (macros) or malicious JavaScript attachments. It is also frequently deployed as a secondary payload by initial access brokers who have compromised networks via exposed RDP instances or unpatched VPN gateways.\n\nOnce executed, Kryptpck operates with devastating efficiency:\n<ul>\n<li><strong>Evasion and Packing:</strong> The \"pck\" in the name often refers to the malware's use of custom, complex software \"packers.\" These packers encrypt or obfuscate the core ransomware executable, hiding it from static antivirus signatures until it is loaded directly into system memory.</li>\n<li><strong>Rapid File Encryption:</strong> The ransomware immediately begins scanning local drives, removable media, and importantly, all mapped and unmapped network shares. It targets specific file extensions (documents, databases, images, archives) and encrypts them using a hybrid encryption scheme (typically AES for the files, with the AES key encrypted via an RSA public key).</li>\n<li><strong>Shadow Copy Deletion:</strong> To prevent easy recovery, Kryptpck almost universally executes commands (like `vssadmin.exe delete shadows /all /quiet`) to instantly destroy Windows Volume Shadow Copies and disable local backup routines.</li>\n<li><strong>Extortion:</strong> After the encryption phase is complete, it drops a ransom note (often a `.txt` or `.html` file) in every affected directory, outlining the payment instructions and threatening permanent data loss.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nA Kryptpck infection is a catastrophic security incident resulting in immediate, catastrophic operational downtime and massive data loss. Due to the strength of modern encryption, files cannot be recovered without the private key or a viable offline backup.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Immediate Physical Isolation:</strong> Disconnect the infected machine from the network immediately (pull the Ethernet cable/disable Wi-Fi) to halt the encryption process and prevent the ransomware from traversing SMB shares to encrypt centralized file servers.</li>\n<li><strong>Do Not Reboot:</strong> Leave the machine powered on. Rebooting may trigger further destructive routines or destroy the encryption key if it temporarily resides in RAM.</li>\n<li><strong>Restore from Offline Backups:</strong> The only reliable remediation is to completely wipe the infected system (bare-metal reinstall) and restore the data from secure, offline backups that were unreachable by the ransomware.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Ransomware.Kryptpck",
    "Trojan-Ransom.Win32.Kryptpck",
    "Packed.Kryptpck"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1486",
    "T1490",
    "T1027.002",
    "T1566.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-01T17:13:20Z",
  "type": "Ransomware",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}