{
  "family": "nymaim",
  "sample_count": 756,
  "category": "downloader",
  "description": "Nymaim (also known as nymain) is a Windows trojan downloader. As documented by Malpedia (Fraunhofer FKIE), it downloads and runs other malware on affected systems and was one of the primary malware families hosted on the Avalanche infrastructure. A distinguishing feature is that Nymaim displays a localized lockscreen on the victim's machine while it downloads additional malware in the background. According to Malpedia, Nymaim is usually delivered through exploit kits and malvertising.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Nymaim?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Nymaim (also known as nymain) is a Windows trojan downloader. According to Malpedia, its main role is to download and run other malware on infected systems, acting as a delivery mechanism for additional threats."
      }
    },
    {
      "@type": "Question",
      "name": "How does Nymaim spread?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Per Malpedia, Nymaim is usually delivered through exploit kits and malvertising (malicious online advertising). It was also one of the primary malware families hosted on the Avalanche infrastructure, a large criminal hosting network."
      }
    },
    {
      "@type": "Question",
      "name": "What makes Nymaim distinctive?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Malpedia notes that Nymaim is distinctive in that it displays a localized lockscreen to the victim while it downloads additional malware in the background. The lockscreen behavior overlaps with ransomware-style tactics, even though its core function is as a downloader."
      }
    },
    {
      "@type": "Question",
      "name": "What was Nymaim's connection to Avalanche?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "According to Malpedia, Nymaim was one of the primary malware families hosted on Avalanche, a large bulletproof-hosting and malware-distribution network. Avalanche was the subject of a major international law-enforcement takedown."
      }
    }
  ],
  "faq_count": 4,
  "mitre_attack": [
    "T1547.001",
    "T1071.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-10",
  "sources": [
    {
      "name": "Malpedia (Fraunhofer FKIE): Nymaim (win.nymaim)",
      "url": "https://malpedia.caad.fkie.fraunhofer.de/details/win.nymaim"
    }
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}