{
  "family": "noupack",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\nNoupack is a malicious Trojan designed to covertly infiltrate Windows systems, establish persistence, and act as a reliable backdoor and downloader for remote threat actors. The name \"Noupack\" often refers specifically to the custom, proprietary packing/obfuscation techniques used by the malware authors to hide the core payload from static antivirus detection.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nNoupack is predominantly distributed through socially engineered spam campaigns containing malicious attachments (often weaponized PDFs or Office documents) or via compromised software installers downloaded from untrustworthy web portals.\n\nUpon successful execution, Noupack operates with a focus on stealth and payload delivery:\n<ul>\n<li><strong>De-obfuscation and Execution:</strong> The initial Noupack executable is heavily packed. Upon execution in memory, it unpacks itself to reveal the true malicious payload, effectively bypassing traditional, signature-based antivirus scanning that only inspects the file on disk.</li>\n<li><strong>Persistence:</strong> Noupack ensures it survives system reboots by modifying the Windows Registry (e.g., adding entries to the `Run` or `RunOnce` keys) or by creating hidden Scheduled Tasks.</li>\n<li><strong>Payload Delivery:</strong> Acting as a downloader, Noupack receives instructions from a command-and-control (C2) server to silently download and execute secondary malware. This frequently includes info-stealers (to harvest credentials), botnet agents, or enterprise ransomware.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nA Noupack infection represents a significant breach of the endpoint perimeter. Because it provides remote attackers with the ability to execute arbitrary code, a single compromised machine can rapidly be utilized to pivot laterally and compromise the entire corporate network.\n\n<h3>Remediation and Eradication</h3>\n<ul>\n<li><strong>Endpoint Detection and Response (EDR):</strong> Static scanning is often ineffective against packed malware. Configure EDR solutions to monitor for anomalous registry modifications, unauthorized outbound network connections, and in-memory execution anomalies.</li>\n<li><strong>Network Isolation and Sweeps:</strong> Immediately isolate the infected endpoint. Conduct a thorough forensic sweep to identify not only the Noupack executable but also any secondary payloads it may have successfully deployed.</li>\n<li><strong>Credential Reset:</strong> Because Noupack often facilitates the deployment of info-stealers, all user credentials associated with the compromised endpoint must be treated as compromised and immediately reset.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.Noupack",
    "Packed.Noupack",
    "Win32/Noupack"
  ],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Noupack and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Noupack 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 Noupack establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Noupack 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 Noupack compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Noupack 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 Trojan.Noupack employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Trojan.Noupack 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 Trojan.Noupack, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Trojan.Noupack 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": [
    "T1027.002",
    "T1105",
    "T1547.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-15",
  "type": "Trojan",
  "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,
  "mitre_attack_detail": [
    {
      "id": "T1027.002",
      "name": "Obfuscated Files or Information: Software Packing",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer",
      "tactic": "Command and Control"
    },
    {
      "id": "T1547.001",
      "name": "Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Immediately isolate affected host(s) from the internal network (disconnect physical Ethernet and disable Wi-Fi/Bluetooth) to prevent Noupack from spreading laterally or encrypting network-attached storage (NAS) and shared SMB volumes.",
    "Preserve volatile system memory (RAM capture) on a representative endpoint before attempting a reboot or power-down, as Noupack symmetric encryption keys or uncompiled payload components may still reside in memory.",
    "Audit process execution logs and terminate active scripting interpreters (e.g. PowerShell, CMD, WScript) or commands executing 'vssadmin.exe delete shadows' or 'wbadmin' used by Noupack to inhibit recovery.",
    "Investigate the initial compromise vector (such as exposed RDP instances, spearphishing attachments, or vulnerable edge gateways) and enforce an immediate credential reset for all compromised Active Directory accounts.",
    "Restore critical assets and databases exclusively from verified, air-gapped, or immutable offline backups once the Noupack binary and related persistence hooks are eradicated."
  ],
  "what_to_avoid": [
    "Do not restart or power cycle infected systems prematurely; doing so destroys volatile RAM encryption keys and may trigger bootloader locking logic embedded in Noupack.",
    "Avoid negotiating or paying the extortion demand without prior forensic evaluation and consultation with incident response specialists, as payment does not guarantee data recovery.",
    "Do not connect clean backup drives or external storage to the affected network until Noupack eradication is completely verified."
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}