What is Spyware?
Spyware is a type of Malware designed to gather information from a user or system unnoticed, without consent. The aim of spyware is usually to spy on user activity, steal sensitive data, or monitor behaviour for commercial or criminal purposes.
🧠 What does spyware do?
Spyware can, among other things:
- Record keystrokes (keylogging)
- Collect passwords, credentials, or credit card information
- Track browsing behaviour and history
- Take screenshots or access the microphone/webcam
- In industrial environments: forward information about processes or devices to attackers
🛠️ How does spyware reach a system?
- Via infected downloads or software installations
- Through malicious email attachments or links
- Bundled as “free” tools or apps that quietly collect data
- Via external media such as USB drives
- In combination with other Malware, such as a trojan or virus
🔍 How do you recognise spyware?
- Slow system performance
- Unexplained data usage or network traffic
- Changes to browser settings or home page
- Devices behaving differently than usual (e.g. suddenly active without input)
🏭 Risks for industrial (OT) environments
In environments with PLCs, SCADA, RTUs, and other industrial components, spyware can:
- Leak process information to unauthorised parties
- Quietly copy configuration data or Setpoints
- Act as a precursor to targeted attacks such as sabotage or Ransomware
- Compromise the confidentiality and integrity of production data
🔐 How to protect against spyware?
- Use Antivirus/anti-Malware software with real-time detection
- Install only trusted software
- Apply updates and patches regularly
- Restrict internet access on critical systems
- Implement network segmentation and the zones and conduits model to isolate spying
- Limit the privileges of users and services to the minimum
📌 In summary
Spyware is a silent threat that can intercept sensitive data without users noticing. In both IT and OT systems, spyware can have a serious impact on privacy, safety, and business continuity.
Want a comparison of spyware with other types of Malware or tools to detect spyware? Let me know!