{
  "family": "multidl",
  "sample_count": 11,
  "category": "trojan",
  "description": "TrojanDownloader:Win32/Multidl is a generic heuristic detection used by antivirus engines to identify malicious stagers whose primary function is to establish a connection to a remote server and download *multiple* secondary payloads simultaneously or sequentially. It is a fundamental component of complex, multi-stage malware infections.<br><br><b>Understanding Multidl Heuristics</b><br>To an end-user, a Multidl execution is usually invisible. For a security analyst, a Multidl alert indicates a severe, cascading infection event. Threat actors use Multidl stagers when they want to deploy an entire toolkit at once—for example, dropping a backdoor for persistence, a keylogger for credential theft, and a cryptominer for immediate monetization, all from a single initial infection vector.<br><br><b>Execution and Staging Mechanics</b><br>Multidl threats are typically distributed as malicious macros embedded in Office documents (`T1566.001`), or as scripts hidden inside ZIP archives. When executed, the stager utilizes native OS utilities (like PowerShell or `wscript.exe`) to quietly reach out to a Command-and-Control server or compromised web host (`T1105`). Unlike a simple downloader, Multidl will iterate through a list of URLs or fetch a configuration file containing multiple download links. It downloads several distinct payloads (often saving them to `%Temp%`) and executes them in rapid succession (`T1204.002`).<br><br><b>Indicators of Compromise & Impact</b><br>The impact is extreme, as the machine is hit with multiple, distinct malware families simultaneously. Incident responders should focus on EDR logs showing a native scripting engine making multiple, rapid outbound HTTP requests, immediately followed by the creation and execution of several different binary files in a temporary directory.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1105",
    "T1566.001",
    "T1204.002",
    "T1059"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer (Downloading multiple payloads)",
      "tactic": "Command and Control"
    },
    {
      "id": "T1059",
      "name": "Command and Scripting Interpreter (Executing the stager)",
      "tactic": "Execution"
    },
    {
      "id": "T1566.001",
      "name": "Phishing: Spearphishing Attachment",
      "tactic": "Initial Access"
    },
    {
      "id": "T1204.002",
      "name": "User Execution: Malicious File",
      "tactic": "Execution"
    }
  ],
  "containment_steps": [
    "Isolate the endpoint immediately; the simultaneous execution of multiple payloads severely increases the risk of lateral movement or ransomware deployment.",
    "Use EDR to trace the process tree and meticulously identify *every* file that was dropped and executed by the Multidl stager.",
    "Block the hardcoded URLs or IP addresses found in the script at the enterprise firewall to protect other users.",
    "Assume total system compromise due to the likelihood of varied payloads (backdoors + stealers) being deployed."
  ],
  "what_to_avoid": [
    "Do not assume the attack is contained after finding just one dropped payload; Multidl specifically downloads multiple, distinct files.",
    "Avoid relying solely on file hashes for the stager, as attackers constantly modify the obfuscation of the scripts."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}