Tspy

Overview

TSpy (classified in antimalware research telemetry under designations including Spyware:Win32/TSpy, TrojanSpy:Win32/TSpy, and Trojan-Spy.Win32.TSpy) is a stealthy information-stealing trojan and surveillance threat. Designed to harvest sensitive enterprise and user credentials, TSpy is delivered via spearphishing attachments, malicious macros, and trojanized utility downloads. Upon execution, TSpy inspects the host environment for debugging tools and virtualization sandboxes before establishing persistence via registry run keys under HKCU\Software\Microsoft\Windows\CurrentVersion\Run. It deploys system-wide API hooks (such as SetWindowsHookEx) to log keystrokes, monitors active web browser windows (Chrome, Firefox, Edge) to intercept form data and session cookies, and extracts saved credentials from FTP clients and email software. TSpy bundles stolen telemetry into encrypted archives and transmits them to external command-and-control servers via HTTP POST requests.

Known aliases

Threat reports may refer to this family under multiple names:

• Spyware:Win32/TSpy
• TrojanSpy:Win32/TSpy
• Trojan-Spy.Win32.TSpy
• Win32/TSpy
• Trojan.Spy.TSpy

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.
• T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.

MITRE D3FEND™ Defensive Countermeasures

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

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_TSPY_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Tspy"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "tspy" ascii wide nocase
        $s2 = "spyware:win32/tspy" ascii wide nocase
        $s3 = "trojanspy:win32/tspy" ascii wide nocase
        $s4 = "trojan-spy.win32.tspy" ascii wide nocase
        $s5 = "win32/tspy" ascii wide nocase
        $s6 = "trojan.spy.tspy" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Tspy (Trojan) Execution & Triage
id: 0961e037-d4bf-5a85-be95-4bfadbda3455
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Tspy malware family. Detects suspicious execution from temporary user directories
  with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/tspy
- https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-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.trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1056_001
- attack.t1555_003
- attack.t1547_001
- attack.t1071_001
- attack.t1082
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \cscript.exe
    - \wscript.exe
    CommandLine|contains:
    - AppData\Local\Temp
    - -WindowStyle Hidden
    - /e:jscript
    - bitsadmin /transfer
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: medium

rule MALWARE_WIN_TSPY_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Tspy 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 = "tspy" 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. Isolate the infected device from the network immediately to prevent further credential exfiltration.
2. Kill active spyware processes and audit installed Windows API hooks.
3. Remove Run keys under HKCU\Software\Microsoft\Windows\CurrentVersion\Run pointing to TSpy executables.
4. Block outbound C2 IP addresses and exfiltration domains across network gateways.
5. Force an immediate password reset for all user accounts, email profiles, and enterprise resources accessed from the host.

What to Avoid

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

1. Do not enter passwords or login credentials on the infected workstation until verified completely disinfected.
2. Do not delay credential revocation, as exfiltrated session cookies and passwords are functional immediately.

References & External Analysis

• Microsoft Defender Threat Encyclopedia - Spyware:Win32/TSpy
• Trend Micro Threat Encyclopedia - TSPY Overview
• Kaspersky Threat Intelligence Portal - Trojan-Spy.Win32.TSpy
• Search "tspy" on VirusTotal (External Analysis)
• Search "tspy" on Any.Run (Sandbox Sandbox)
• Search "tspy" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Spypro
• Winreg
• Genericrxfy
• Phpw
• Lsslogger
• Polypatch
• Comproc
• Bloored

Machine-readable

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