Spytector

Overview

Spytector (cataloged across security vendors as MonitoringTool:Win32/Spytector, Spytector Keylogger, and Spytector.Delphi) is a sophisticated commercial-grade surveillance tool and stealth keylogger engineered in Delphi. Marketed as an undetectable monitoring utility, Spytector has been heavily repurposed by cybercriminals for unauthorized corporate espionage and credential theft. Upon execution, Spytector installs its payload silently, injects into legitimate Windows processes (such as explorer.exe), and establishes API hooks via SetWindowsHookEx to intercept all user keystrokes, clipboard modifications, opened application windows, and visited URLs. Additionally, Spytector extracts stored account credentials and cookies from major browsers, email clients, and instant messaging software. The harvested surveillance logs and screenshots are encrypted and automatically exfiltrated to threat actors via scheduled SMTP email dispatches or remote FTP server uploads.

Known aliases

Threat reports may refer to this family under multiple names:

• Spytector Keylogger
• Spytector Surveillance
• Spytector.Delphi
• MonitoringTool:Win32/Spytector
• Trojan.Spytector

Family Pedigree & Lineage

Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:

Derived From / Upstream Ancestry: Delphi Keylogger Frameworks

Known Derivatives & Downstream Variants: Spytector 1.X · Spytector 2.X · Spytector Stealth · Spytector.Delphi

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

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.
• T1113: Monitor for frequent or unauthorized screen captures or clipboard reads. Restrict background applications from accessing desktop APIs.

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

Indicators of Compromise

Public indicators drawn from CISA advisories and vendor reporting. These are historical and intended for retrospective threat hunting; current campaigns may use different infrastructure. SystemHelpDesk adheres to responsible disclosure and does not host live samples.

File hashes (SHA-256, sample)

Cryptographic hashes serve as reference indicators for triage and detection rules. In accordance with responsible threat intelligence disclosure, this catalog indexes reference metadata and does not host or distribute live malware binaries.

• 5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e
• 1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b

Delivery vectors

• Targeted spear-phishing emails containing trojanized PDF attachments or setup utilities
• Direct physical installation or remote desktop compromise by malicious insiders

Persistence mechanisms

• HKLM\Software\Microsoft\Windows\CurrentVersion\Run\SpytectorServer
• HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit

Tiered Detection Rules (Cisco CAIRN Model)

Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:

rule MALWARE_WIN_SPYTECTOR_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Spytector"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "spytector" ascii wide nocase
        $s2 = "spytector keylogger" ascii wide nocase
        $s3 = "spytector surveillance" ascii wide nocase
        $s4 = "spytector.delphi" ascii wide nocase
        $s5 = "monitoringtool:win32/spytector" ascii wide nocase
        $s6 = "trojan.spytector" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Spytector (Infostealer) Execution & Triage
id: 7cc830f8-aae9-5b07-a782-319c372b3518
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Spytector malware family. Detects browser credential database harvesting,
  master key queries, and DPAPI extraction routines typical of modern infostealers.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/spytector
- https://malware-families-catalog.systemhelpdesk.com/defensive/infostealer-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.infostealer
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1056_001
- attack.t1113
- attack.t1115
- attack.t1555_003
- attack.t1048_003
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \rundll32.exe
    CommandLine|contains:
    - \Google\Chrome\User Data\Default\Login Data
    - \AppData\Roaming\Mozilla\Firefox\Profiles
    - \AppData\Local\Microsoft\Edge\User Data
    - vaultcmd.exe /list
    - dpapi
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: high

rule MALWARE_WIN_SPYTECTOR_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Spytector tradecraft"
        tier = "T3 - Attribution Fingerprint"
        confidence = "High (Confirmed Family Signature)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        // Core family identifier & heuristic payload signatures
        $attrib_str = "spytector" ascii wide nocase
        $pe_magic = "MZ" ascii
        $net_marker = "http" ascii nocase
    condition:
        uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Disconnect the affected computer from local networks to block outbound SMTP and FTP exfiltration.
2. Use endpoint detection tools to unhook API interception routines and terminate injected explorer.exe threads.
3. Delete Spytector persistence keys from the Windows registry.
4. Rotate all corporate passwords, user credentials, and encryption keys entered on the host during the infection window.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not enter sensitive credentials or corporate passwords on systems showing signs of unauthorized process injection.
2. Avoid installing untrusted monitoring or utility applications without corporate IT authorization.

References & External Analysis

• Microsoft Defender Security Intelligence - MonitoringTool:Win32/Spytector
• Spytector Official Research & Detection Dossier
• Search "spytector" on VirusTotal (External Analysis)
• Search "spytector" on Any.Run (Sandbox Sandbox)
• Search "spytector" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Infostealer)

Explore other documented threats in the same operational category:

• Coinstealer
• Olgames
• Agenttesla
• Ardamax
• Steam
• Allinonekeylogger
• Ldpinch
• Usteal

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/spytector.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.