{
  "family": "murofet",
  "sample_count": 53,
  "category": "trojan",
  "description": "Trojan:Win32/Murofet is a sophisticated, highly persistent trojan downloader that gained notoriety in the early 2010s for acting as a primary Initial Access Broker and delivery mechanism for the devastating Zeus (Zbot) banking trojan.<br><br><b>Understanding Murofet</b><br>To the end-user, a Murofet infection is typically invisible until the devastating secondary payload (Zeus) executes and drains their bank accounts. For threat intelligence analysts, Murofet is a critical staging mechanism. It is engineered to bypass initial endpoint defenses, profile the infected machine to ensure it is not a sandbox, and reach out to a Command-and-Control (C2) server to securely pull down the final, destructive payload.<br><br><b>Execution and Evasion Strategies</b><br>Murofet is commonly distributed via massive malspam campaigns containing weaponized attachments (like ZIP files or Office macros) or through exploit kits like Blackhole. Upon execution, it utilizes heavy packing and dynamic API resolution to evade static antivirus signatures. Murofet is renowned for its early adoption of Domain Generation Algorithms (DGA) (`T1568.002`). Instead of connecting to a hardcoded IP, it algorithmically generates thousands of potential C2 domains daily, making it incredibly difficult for defenders to block the traffic via traditional blacklists. It establishes persistence via the Registry Run keys and frequently injects its downloading routine into legitimate system processes (like `svchost.exe`).<br><br><b>Indicators of Compromise & Impact</b><br>The primary impact is the delivery of a high-severity secondary payload, usually a banking trojan. EDR platforms will flag the Process Injection (`T1055`). The most distinct IoC for Murofet is the DNS traffic: network logs will show the infected host rapidly querying hundreds of nonsensical, randomly generated domain names (the DGA in action) as it attempts to locate its active C2 server. Memory analysis is necessary to extract the injected downloader modules.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1055",
    "T1105",
    "T1547.001",
    "T1568.002",
    "T1027"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1568.002",
      "name": "Dynamic Resolution: Domain Generation Algorithms",
      "tactic": "Command and Control"
    },
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer",
      "tactic": "Command and Control"
    },
    {
      "id": "T1055",
      "name": "Process Injection",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1547.001",
      "name": "Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder",
      "tactic": "Persistence"
    },
    {
      "id": "T1027",
      "name": "Obfuscated Files or Information",
      "tactic": "Defense Evasion"
    }
  ],
  "containment_steps": [
    "Isolate the endpoint immediately to prevent Murofet from successfully resolving its DGA domains and downloading the Zeus banking trojan.",
    "Analyze DNS logs for high volumes of NXDOMAIN responses, which indicate the DGA is actively searching for the C2 infrastructure.",
    "Audit the Windows Registry Run keys to identify and remove the Murofet persistence mechanisms.",
    "Assume secondary payloads have already been downloaded; a complete, clean rebuild of the operating system is the most secure remediation."
  ],
  "what_to_avoid": [
    "Do not close an incident simply because the initial Murofet dropper was quarantined; always verify if the Zeus payload was downloaded.",
    "Avoid relying on static IP blacklists for defense; Murofet's DGA renders traditional blocking ineffective."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}