{
  "family": "injectorlib",
  "sample_count": 3,
  "category": "ransomware",
  "description": "HackTool:Win32/Injectorlib is not a standalone malware family, but a **Heuristic Detection** specifically targeting the *behavior* of Code Injection. It flags executable files or dynamic-link libraries (DLLs) that attempt to forcefully insert their code into the memory space of another running process. This is a foundational technique used by nearly all advanced malware to evade detection and hide their malicious activity.<br><br><b>Understanding Process Injection (Injectorlib)</b><br>To an end-user, this detection usually appears as a blocked execution of a seemingly random file. For a security analyst, an Injectorlib alert is a critical indicator of Defense Evasion (`T1055`). By injecting code into a legitimate, trusted process (like `svchost.exe`, `explorer.exe`, or a browser), the malware can bypass host-based firewalls, evade static antivirus signatures, and operate under the security context of the hijacked process.<br><br><b>Execution and Injection Mechanics</b><br>The mechanics of injection vary depending on the specific malware using it. Common methods flagged by this heuristic include DLL Injection (`T1055.001`), where the malware forces a remote process to load a malicious DLL using `CreateRemoteThread` and `LoadLibrary`; Process Hollowing (`T1055.012`), where a legitimate executable is started in a suspended state, its memory unmapped, and replaced with malicious code; and Asynchronous Procedure Call (APC) injection (`T1055.004`), where malicious code is attached to a thread's APC queue. The Injectorlib heuristic monitors API calls associated with these techniques, such as `VirtualAllocEx`, `WriteProcessMemory`, and `SetThreadContext`.<br><br><b>Indicators of Compromise & Impact</b><br>The impact depends on the injected payload, ranging from data theft to ransomware deployment. Host-based IoCs include EDR alerts specifically highlighting cross-process memory access, anomalous child processes spawning from system binaries (e.g., `svchost.exe` launching `cmd.exe`), and unexpected network connections originating from trusted processes. Memory analysis is essential to extract the injected payload and determine the true nature of the attack.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1055",
    "T1055.001",
    "T1055.012"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1055",
      "name": "Process Injection (The core heuristic trigger)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1055.001",
      "name": "Process Injection: Dynamic-link Library Injection",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1055.012",
      "name": "Process Injection: Process Hollowing",
      "tactic": "Defense Evasion"
    }
  ],
  "containment_steps": [
    "Isolate the endpoint to prevent the injected payload from executing its network objectives (C2 communication, lateral movement).",
    "Do not rely solely on static AV scans; the malicious code is running dynamically in the memory of a legitimate process.",
    "Capture a full memory dump (RAM) of the infected system *before* rebooting to allow forensic analysts to extract the injected payload.",
    "Identify and terminate the initial dropper process that attempted the injection, and then terminate the hijacked target process."
  ],
  "what_to_avoid": [
    "Do not whitelist the targeted process (e.g., `svchost.exe`) just because it is a system file; the malicious code is hiding inside it.",
    "Avoid releasing the file that triggered the Injectorlib heuristic from quarantine without full sandbox analysis."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}