{
  "family": "goznym",
  "sample_count": 120,
  "category": "banking_trojan",
  "description": "Trojan:Win32/Goznym is a devastating, highly sophisticated hybrid banking trojan that merged the stealth and dropping capabilities of the Nymaim loader with the severe financial fraud and web-injection modules of the Gozi (ISFB) trojan.<br><br><b>Understanding GozNym</b><br>To the victim, a GozNym infection often results in catastrophic financial loss—the malware drains bank accounts while locking the screen to prevent interference. For threat intelligence analysts, GozNym represents a 'best of both worlds' cybercrime masterpiece. Before law enforcement dismantled the network, it caused tens of millions of dollars in damages globally by combining Nymaim's ability to silently bypass AV and deliver payloads with Gozi's legendary ability to intercept and manipulate online banking sessions.<br><br><b>Execution and Evasion Strategies</b><br>GozNym was primarily distributed via massive, highly targeted spearphishing campaigns (often using the Avalanche botnet infrastructure) containing weaponized macros. Upon execution, the Nymaim component utilizes heavy packing, anti-debugging, and anti-VM checks. It establishes persistence and reaches out to a DGA-generated C2 to download the Gozi component as an encrypted DLL. This DLL is injected directly into the browser process (e.g., <code>explorer.exe</code> or <code>chrome.exe</code>). GozNym then utilizes advanced API hooking to intercept HTTPS traffic (Man-in-the-Browser), injecting fraudulent HTML fields into legitimate banking websites to capture passwords, PINs, and bypass 2FA tokens.<br><br><b>Indicators of Compromise & Impact</b><br>The impact is immediate, severe financial theft. Threat hunters should investigate EDR alerts for 'Suspicious Browser Injection' or 'API Hooking Detected'. Network logs will reveal encrypted C2 communications using custom protocols to transmit the stolen credentials. Memory forensics is absolutely critical; analysts must dump the browser's memory to extract the injected Gozi DLL and the downloaded web-inject configuration files.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1185",
    "T1105",
    "T1055.001",
    "T1568.002",
    "T1056.004"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1185",
      "name": "Browser Session Hijacking",
      "tactic": "Collection"
    },
    {
      "id": "T1055.001",
      "name": "Process Injection: Dynamic-link Library Injection",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1056.004",
      "name": "Input Capture: Credential API Hooking",
      "tactic": "Credential Access"
    },
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer",
      "tactic": "Command and Control"
    },
    {
      "id": "T1568.002",
      "name": "Dynamic Resolution: Domain Generation Algorithms",
      "tactic": "Command and Control"
    }
  ],
  "containment_steps": [
    "Immediately isolate the endpoint from the network to halt the active exfiltration of banking credentials and prevent fraudulent wire transfers.",
    "Assist the user in immediately contacting their financial institutions to freeze accounts, block recent transactions, and reset all banking passwords.",
    "Capture a live memory image (RAM dump) to extract the injected GozNym DLLs and the downloaded web-inject configuration files.",
    "Perform a clean OS rebuild; GozNym establishes deep, complex hooks in the registry and browser processes that are extremely difficult to eradicate manually."
  ],
  "what_to_avoid": [
    "Do not allow the user to access any online banking or financial portals while the machine is infected.",
    "Avoid rebooting the machine before capturing memory, as the critical web-inject configurations exist only in RAM."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}