{
  "family": "autoitscript",
  "sample_count": 5,
  "category": "trojan",
  "description": "Trojan:Win32/Autoitscript refers to a broad classification of malware that is developed using or heavily relies upon **AutoIt**, a legitimate freeware BASIC-like scripting language designed for automating the Windows GUI and general scripting. Threat actors highly favor AutoIt for writing malware wrappers, crypters, and droppers because it is easy to use, allows for direct calls to the Windows API, and, crucially, compiled AutoIt scripts are notoriously difficult for static antivirus engines to analyze effectively.<br><br><b>Understanding the Abuse of AutoIt</b><br>To an end-user, an AutoIt malware payload looks like any standard `.exe` file. For a malware analyst, encountering an AutoIt-compiled binary means the actual malicious logic is buried beneath layers of the legitimate AutoIt interpreter and heavy obfuscation. Attackers use it to 'wrap' known malware (like Remcos RAT or Agent Tesla), ensuring the final payload remains completely encrypted on disk until the AutoIt script runs in memory.<br><br><b>Execution and Evasion Strategies</b><br>AutoIt-based malware is typically distributed via spear-phishing (`T1566.001`). When the user double-clicks the file (`T1204.002`), the AutoIt interpreter (embedded in the `.exe`) starts. The script inside is usually heavily obfuscated, utilizing junk code, string encryption, and dynamic variable naming (`T1027`). The script's primary function is often to execute a technique known as 'Process Hollowing' or 'RunPE' (`T1055.012`). It will launch a legitimate Windows process (like `svchost.exe` or `RegAsm.exe`) in a suspended state, unmap its memory, and inject the final decrypted malicious payload into it, before resuming the thread. This makes the malware appear as a legitimate, signed Microsoft process to the operating system.<br><br><b>Indicators of Compromise & Impact</b><br>The impact depends entirely on the hidden secondary payload (often an information stealer or RAT). Host-based IoCs include EDR alerts for 'Suspicious Process Hollowing' or an unsigned executable spawning instances of `RegAsm.exe` or `vbc.exe` with no command-line arguments. Incident responders must use specialized AutoIt decompilers (like Exe2Aut) to extract the original script to understand the true nature of the attack.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1129",
    "T1055.012",
    "T1027",
    "T1059.005"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1055.012",
      "name": "Process Injection: Process Hollowing",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1027",
      "name": "Obfuscated Files or Information (AutoIt compilation/encryption)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1129",
      "name": "Shared Modules (Direct API calls via DllCall)",
      "tactic": "Execution"
    },
    {
      "id": "T1059.005",
      "name": "Command and Scripting Interpreter: Visual Basic (AutoIt similarity)",
      "tactic": "Execution"
    }
  ],
  "containment_steps": [
    "Isolate the endpoint to prevent the injected secondary payload (which the AutoIt script dropped) from communicating with its C2 server.",
    "Use advanced memory forensics tools (like Volatility) to dump the memory of the suspicious, hollowed processes to extract the final, unencrypted payload.",
    "Decompile the original AutoIt executable in a sandboxed environment to extract the hardcoded C2 domains, encryption keys, or dropped files.",
    "Hunt for similar AutoIt-compiled executables across the network using EDR queries targeting unknown binaries with AutoIt-specific metadata in the PE headers."
  ],
  "what_to_avoid": [
    "Do not rely solely on static analysis of the dropped `.exe`, as you will only be analyzing the legitimate AutoIt interpreter, not the malicious payload.",
    "Avoid allowing users to run unsigned executables from temporary directories, as this is a primary execution path for AutoIt wrappers."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}