{
  "family": "hooker",
  "sample_count": 1,
  "category": "trojan",
  "description": "<h3>Executive Summary</h3>\n\"Hooker\" refers to a category of highly invasive software—often classified as Spyware, HackTools, or Info Stealers—that utilizes deep Windows API hooking to intercept and manipulate communication between the operating system and running applications. While some legitimate security software uses these techniques, \"Hooker\" variants are specifically designed by threat actors to silently capture sensitive data, most notably functioning as advanced keyloggers and credential harvesters.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nMalicious Hooker utilities are typically deployed via targeted spear-phishing campaigns, hidden within trojanized software installers, or dropped by an initial access broker who has compromised the system.\n\nOnce executed, the malware leverages deep system access:\n<ul>\n<li><strong>API Hooking (`SetWindowsHookEx`):</strong> This is the defining characteristic. The malware injects a DLL into running processes and utilizes the `SetWindowsHookEx` API to insert a \"hook procedure\" into the message traffic of the system. This allows the malware to intercept hardware interrupts (like keystrokes or mouse clicks) before they reach the intended application.</li>\n<li><strong>Inline Hooking (Detours):</strong> More advanced variants may overwrite the beginning of specific API functions (like those used for network communication or file access) with a jump instruction, redirecting the execution flow to the malware's own code.</li>\n<li><strong>Data Exfiltration:</strong> By intercepting these low-level messages, the Hooker silently records passwords, chat logs, and banking information to encrypted, hidden files, which are later exfiltrated to a C2 server.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nThe detection of an unauthorized Hooker is a critical security incident. Because it intercepts data at the API level, it can capture passwords even if the user is interacting with a secure (HTTPS) website or application. The presence of this malware guarantees the compromise of any credential entered on the machine.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Immediate Network Isolation:</strong> The highest priority is to disconnect the infected endpoint from the network to halt the active exfiltration of the intercepted data logs.</li>\n<li><strong>Global Credential Reset:</strong> It must be assumed that *all* passwords typed on the machine have been stolen. A mandatory, immediate reset of all associated enterprise credentials is required.</li>\n<li><strong>Complete Re-imaging:</strong> Due to the deep system hooking and DLL injection utilized by this malware, attempting to \"clean\" the machine manually is highly risky and often ineffective. A complete bare-metal wipe and re-image from a trusted baseline is necessary.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Spyware.Hooker",
    "Trojan.Keylogger.Hook",
    "HackTool.Hooker",
    "Win32/APIHook"
  ],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Hooker and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Hooker is classified as a Trojan. 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 Hooker establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Hooker 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 Hooker compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Hooker 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 secondary payloads and staging behaviors are commonly associated with Spyware.Hooker?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Spyware.Hooker frequently operates as a loader or dropper designed to establish a foothold before downloading and executing secondary high-impact malware payloads. Depending on the threat actor's objectives, these dropped modules can range from ransomware and banking injects to modular infostealers and remote management backdoors."
      }
    },
    {
      "@type": "Question",
      "name": "How can security operations teams effectively detect and hunt for Spyware.Hooker across enterprise endpoints?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Defenders should hunt for Spyware.Hooker by deploying behavioral endpoint detection and response (EDR) rules that monitor suspicious process spawning (such as cmd.exe or powershell.exe spawned from office documents or temporary directories), anomalous outbound network connections from non-browser binaries, and unauthorized modifications to Windows Run keys and scheduled task registries."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1056.001",
    "T1055.001",
    "T1115",
    "T1129"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-15",
  "type": "HackTool / Spyware (Keylogger)",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "mitre_attack_detail": [
    {
      "id": "T1056.001",
      "name": "Keylogging",
      "tactic": "Credential Access"
    },
    {
      "id": "T1055.001",
      "name": "Dynamic-link Library Injection",
      "tactic": "defense-evasion"
    },
    {
      "id": "T1115",
      "name": "Clipboard Data",
      "tactic": "Collection"
    },
    {
      "id": "T1129",
      "name": "Shared Modules (Direct API calls via DllCall)",
      "tactic": "Execution"
    }
  ],
  "containment_steps": [
    "Sever network connectivity for the flagged endpoint to terminate persistent command-and-control (C2) communication channels and stop Hooker from retrieving secondary stage payloads.",
    "Capture process memory triage to detect and terminate malicious threads injected by Hooker into legitimate system processes such as explorer.exe or svchost.exe.",
    "Audit Windows Registry Run keys (HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run) and Task Scheduler entries to locate and purge Hooker persistence hooks.",
    "Deploy updated enterprise EDR detection signatures and conduct an out-of-band endpoint scan to isolate dropped binaries and staged payloads.",
    "Rotate all credentials, domain user passwords, and session cookies active on the system during the Hooker execution timeframe."
  ],
  "what_to_avoid": [
    "Do not assume the incident is resolved simply because an antivirus tool removed the initial Hooker dropper; always verify that secondary payloads and persistence hooks have been eradicated.",
    "Avoid logging in with Domain Admin or privileged credentials on a machine suspected of running Hooker until memory triage is complete.",
    "Do not delay host isolation; automated lateral movement and credential dumping can occur within minutes of initial execution."
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows 7"
  ]
}