{
  "family": "veil",
  "sample_count": 19,
  "category": "advanced_threat",
  "description": "HackTool:Win32/Veil (often detected generically as `Veil-Evasion` or simply `Veil`) is not a specific malware family, but rather a highly popular, open-source framework used by both penetration testers and malicious actors to generate payloads that bypass common static antivirus (AV) detection mechanisms.<br><br><b>Understanding the Veil Framework</b><br>To an end-user, a payload generated by Veil appears as a normal executable, document, or script. For a security analyst, a detection of 'Veil' indicates that an attacker has deliberately attempted to obfuscate their initial access payload (usually a Meterpreter reverse shell or a Cobalt Strike beacon) to slip past traditional signature-based defenses. Veil operates by wrapping the core malicious payload in various languages (Python, Go, C#, Ruby) and compiling it dynamically to alter its cryptographic hash and static byte sequence.<br><br><b>Execution and Obfuscation Tactics</b><br>Veil is not 'executed' on the target in its framework form; rather, the output of Veil is executed. Attackers deliver these heavily obfuscated payloads via spearphishing (`T1566.001`) or exploit kits. The generated payload utilizes techniques like shellcode injection, process hollowing, or API unhooking (`T1055`) to execute the underlying malicious code purely in memory (`T1620`), avoiding touching the disk whenever possible. Because the wrapper code is constantly changing, static AV signatures are often ineffective against fresh Veil payloads.<br><br><b>Indicators of Compromise & Impact</b><br>The impact depends entirely on the payload Veil was wrapping (typically a reverse shell leading to full system compromise). EDR platforms (which monitor behavior rather than static signatures) are critical for detecting Veil payloads. Analysts should look for anomalous child processes spawning from generic applications (e.g., `powershell.exe` or `python.exe` making unexpected network connections), or alerts related to memory allocation and thread execution in remote processes (indicative of shellcode injection).",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1055",
    "T1105",
    "T1059",
    "T1027",
    "T1620"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1027",
      "name": "Obfuscated Files or Information",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1055",
      "name": "Process Injection",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1620",
      "name": "Reflective Code Loading",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1059",
      "name": "Command and Scripting Interpreter",
      "tactic": "Execution"
    },
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer",
      "tactic": "Command and Control"
    }
  ],
  "containment_steps": [
    "Isolate the endpoint immediately; a Veil detection implies a deliberate, targeted attempt to bypass defenses and establish a remote shell.",
    "Assume total endpoint compromise. The Veil payload was likely just the entry point for further post-exploitation frameworks (like Cobalt Strike or Metasploit).",
    "Capture a full memory dump (RAM) of the infected machine before rebooting; the true malicious payload is likely running injected within legitimate process memory.",
    "Hunt for lateral movement. Check Windows Event Logs (e.g., Event ID 4624 for successful logons) and network traffic for internal pivoting."
  ],
  "what_to_avoid": [
    "Do not rely on the static file hash of the Veil payload for sweeping the enterprise; Veil generates unique hashes every time it compiles a payload.",
    "Avoid assuming the incident is resolved simply by deleting the dropped file; the attacker may have already migrated the shell into another process."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}