Hooker
Overview
Executive Summary
"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.Infection Vector and Technical Capabilities
Malicious 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. Once executed, the malware leverages deep system access:- API Hooking (`SetWindowsHookEx`): 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.
- Inline Hooking (Detours): 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.
- Data Exfiltration: 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.
Threat Assessment
The 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.Incident Response and Remediation
- Immediate Network Isolation: The highest priority is to disconnect the infected endpoint from the network to halt the active exfiltration of the intercepted data logs.
- Global Credential Reset: 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.
- Complete Re-imaging: 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.
Known aliases
Threat reports may refer to this family under multiple names:
MITRE ATT&CK Techniques
This family has been observed using the following ATT&CK techniques: T1056.001 T1055.001 T1115 T1129
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1056.001: Implement Endpoint Detection and Response (EDR) to monitor for suspicious API calls related to keystroke interception. Enforce Multi-Factor Authentication (MFA) to render stolen passwords useless.
Generated Detections (Boilerplate)
These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.
YARA Rule
rule MALWARE_WIN_HOOKER {
meta:
description = "Detects Hooker (trojan)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "hooker" ascii wide nocase
$s2 = "spyware.hooker" ascii wide nocase
$s3 = "trojan.keylogger.hook" ascii wide nocase
$s4 = "hacktool.hooker" ascii wide nocase
$s5 = "win32/apihook" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Sigma Rule
title: Suspicious Hooker Activity
id: 6f22b69b652511f0392680930de7736a
status: experimental
description: Detects generic indicators of the hooker malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*hooker*"
- "*spyware.hooker*"
- "*trojan.keylogger.hook*"
- "*hacktool.hooker*"
- "*win32/apihook*"
condition: selection
level: mediumReferences & External Analysis
- Search "hooker" on VirusTotal (External Analysis)
Frequently Asked Questions
How do I remove the Hooker Trojan from Windows?
Manual removal of Hooker is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
Is Hooker a virus or a Trojan?
Hooker is classified as a Trojan. Unlike traditional viruses that infect files, modern malware like Hooker typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Hooker infection?
Symptoms of Hooker can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Related Families (Category: trojan)
Explore other malware families in the same category:
Protect Your Network Against Trojans
Want to prevent Hooker and similar threats from compromising your organization? Read our comprehensive defensive guide: Banking Trojan Protection.
Machine-readable
Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/hooker.json
Ecosystem & Interactive Environments
This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.