{
  "family": "macrodrop",
  "sample_count": 2,
  "category": "ransomware",
  "description": "TrojanDownloader:O97M/Macrodrop is a highly prevalent category of malware that utilizes weaponized Microsoft Office macros (VBA code) to establish an initial foothold and download secondary payloads (`T1059.005`). It is the prototypical 'first stage' for many sophisticated attacks, acting as the bridge between a phishing email and a severe system compromise.<br><br><b>Understanding Macrodrop</b><br>To an end-user, Macrodrop looks like a legitimate, but slightly broken, Word or Excel document that requests them to 'Enable Content' or 'Enable Macros' to view the full text. For a security team, Macrodrop is a critical Initial Access vector (`T1566.001`). The macro itself is not the ultimate threat; it is merely the delivery vehicle for something much worse, such as Emotet, Trickbot, or a ransomware loader.<br><br><b>Execution and Evasion Strategies</b><br>Macrodrop relies entirely on social engineering. It is distributed via massive spear-phishing campaigns. When the user clicks 'Enable Content', the embedded VBA script executes. Modern Macrodrop variants heavily obfuscate their VBA code using string concatenation, random variable names, and junk code to evade static AV scanning (`T1027`). The executed macro typically utilizes `cmd.exe` or PowerShell (`T1059.001`) to silently connect to a remote, compromised server, download the secondary executable (often heavily packed), save it to `%Temp%`, and execute it (`T1105`).<br><br><b>Indicators of Compromise (IoCs)</b><br>The primary impact is the successful download of a secondary, destructive payload. Host-based IoCs include EDR alerts for Microsoft Office applications (`WINWORD.EXE`, `EXCEL.EXE`) exhibiting anomalous behavior, specifically spawning child processes like `cmd.exe`, `powershell.exe`, `wscript.exe`, or `certutil.exe`. Network IoCs involve the Office application attempting to make outbound HTTP/HTTPS connections to unknown or recently registered domains.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Macrodrop and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Macrodrop is classified as a Ransomware. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments."
      }
    },
    {
      "@type": "Question",
      "name": "How does Macrodrop establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Macrodrop typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks."
      }
    },
    {
      "@type": "Question",
      "name": "What are the essential incident response steps for mitigating a Macrodrop compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Macrodrop should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups."
      }
    },
    {
      "@type": "Question",
      "name": "What cryptographic algorithms and file targeting techniques does Macrodrop employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Macrodrop typically leverages hybrid cryptographic architectures combining symmetric stream or block ciphers (such as AES-256 or ChaCha20) for rapid file encryption with asymmetric algorithms (such as RSA-2048 or Curve25519) to securely protect the session keys. It aggressively targets sensitive file extensions including corporate documents, databases, virtual disks, and backups while systematically executing commands to delete Volume Shadow Copies (vssadmin delete shadows /all /quiet) and disable system recovery options."
      }
    },
    {
      "@type": "Question",
      "name": "Are decryptors available for Macrodrop, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Macrodrop depends on whether security researchers or law enforcement (such as the No More Ransom initiative) have recovered the master private keys or discovered flaws in its key generation routines. Victims should never pay the extortion demand, as payment fuels criminal operations without guaranteeing file restoration. The recommended recovery procedure entails isolating infected hosts, conducting forensic disk imaging, identifying the root access vector, and restoring validated systems from immutable offline backups."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1105",
    "T1059.005",
    "T1059.001",
    "T1566.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1566.001",
      "name": "Phishing: Spearphishing Attachment (The primary delivery method)",
      "tactic": "Initial Access"
    },
    {
      "id": "T1059.005",
      "name": "Command and Scripting Interpreter: Visual Basic (Executing the weaponized macro)",
      "tactic": "Execution"
    },
    {
      "id": "T1059.001",
      "name": "Command and Scripting Interpreter: PowerShell (Often used by the macro to download the payload)",
      "tactic": "Execution"
    },
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer (Downloading the secondary malware)",
      "tactic": "Command and Control"
    }
  ],
  "containment_steps": [
    "Isolate the endpoint to prevent the downloaded secondary payload from establishing C2 communication or moving laterally.",
    "Extract and deobfuscate the VBA macro from the malicious document to identify the payload download URLs.",
    "Search enterprise proxy and DNS logs for the extracted C2 URLs to identify other potentially infected machines.",
    "Implement Group Policy Objects (GPOs) to block the execution of Office macros originating from the Internet (Mark of the Web)."
  ],
  "what_to_avoid": [
    "Do not focus solely on removing the Word document; you must assume the secondary payload executed and hunt for it.",
    "Avoid allowing users to enable macros universally; employ strict macro execution policies and trusted locations."
  ],
  "target_industries": [
    "Healthcare",
    "Critical Infrastructure",
    "Enterprise"
  ],
  "motivation": "Financial Extortion",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "defense_evasion",
    "impact"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}