What is spyware?
Spyware is one type of malware designed to infiltrate computer systems and track a user's activity and uncover personal data, obviously without their consent. It's often used to steal sensitive data such as passwords, financial details and browsing habits. Its presence is generally hidden, and it can be difficult to detect.
How spyware works
Spyware sneaks into systems in various ways, such as through deceptive downloads, email attachments, or software vulnerability exploits. You can end up granting spyware permission to install itself without meaning to, for example by accepting the terms and conditions of seemingly trustworthy software without carefully reading the fine print. Once installed, it can monitor the user's activity, log keystrokes, capture screenshots, and send this information to an attacker.
Types of spyware
The type of spyware infection often depends on the goals of its developers. Below are some types of spyware and their specific functions:
Banking trojans, built to steal data from banks and financial institutions, are designed to capture information from financial entities. They exploit weaknesses in browser security to alter web pages, tamper with transaction content, or add new transactions, all without the user or the hosting application noticing. These trojans can target a wide range of financial entities, including banks, brokers, online finance portals and digital wallets, then send the collected data to a remote server for harvesting.
Password stealers are malware built to steal passwords from compromised computers. The passwords obtained can include credentials saved in browsers, credentials for specific systems, and other critical passwords. This information can be stored by attackers directly on the infected device or sent to a remote server for retrieval.
Infostealers are spyware that hunt for information on infected computers, including usernames, passwords, email addresses, browsing history, log files, system details, documents, spreadsheets and other media files. Like banking trojans, infostealers exploit gaps in browser security to harvest personal data from online services and forums, then send this information to a remote server or save it on the computer for later retrieval.
Keyloggers, or system monitors, are built to record computer activity, including keystrokes, sites visited, search history, email conversations, chat dialogues and system credentials. They typically capture screenshots of the active window at regular intervals. Keyloggers can also secretly record and send images and video/audio captured from connected devices. They can also let hackers intercept documents sent to connected printers, then transfer them to a remote server or save them locally for retrieval.
How is spyware detected and removed?
Recognizing a spyware infection can be difficult, especially without technical skills. Common signs include system slowdown, incessant pop-up ads, and unauthorized changes to system settings. To detect spyware, you can use antivirus and antispyware software, along with system analysis techniques such as reviewing running processes and analyzing network traffic.
Removing spyware can vary depending on the malware's complexity. Specialized antivirus and antispyware tools are generally effective. In some cases, manual intervention may be needed, such as editing the system registry or removing infected files.
How to avoid spyware infection
The most effective defense against spyware, as with other types of malware, relies on your own behavior and preventive actions. Here are some fundamental rules for solid self-defense:
Avoid opening emails from unknown senders.
Don't download files unless you're certain of their trustworthy origin.
Hover over links to check the destination URL before clicking, making sure it points where you expect it to.
The best anti-spyware software
Finding the best anti-spyware software is no easy task. There are several free and paid solutions worth considering. Among the best anti-spyware tools we can certainly mention Spybot Search & Destroy, MalwareBytes, Adaware, SpywareBlaster, as well as several other less specialized antivirus programs.