Antivirus software
Antivirus software is a class of software tools for detecting, blocking and removing malicious code, providing real-time protection of devices against viruses, Trojans, ransomware and cyberattacks.
Contents
What is antivirus software
Antivirus software (antivirus) is specialized utilities and complexes for comprehensive protection of digital devices (PCs, servers, mobile phones) from the penetration and spread of malicious code. Unlike basic network firewalls, the antivirus works at the level of the file system and memory, analyzing program behavior rather than only network packets.
The main task of an antivirus is not just to detect a threat, but also to prevent the theft of personal data, loss of access to files (due to ransomware) and the conversion of the device into part of a botnet for DDoS attacks. In the corporate sector, antivirus solutions are often integrated with SIEM systems, antispam filters and DLP systems to create a unified security circuit, which is especially important for critical information infrastructure (CII) facilities.
How antivirus software works
Modern antiviruses use a multi-layered protection approach that includes several key technologies:
- Signature analysis — a classic method in which the antivirus compares the file code with a database of signatures (digital fingerprints) of already known viruses. The databases are updated daily, but this method is powerless against new, unknown threats (the so-called zero-day threats).
- Heuristic analysis — an algorithm that analyzes the structure of the code and its intended actions (for example, an attempt to modify system files or encrypt data) without a signature. This allows identifying new modifications of viruses before they enter the database.
- Behavioral monitoring (Proactive Defense) — the most advanced method, in which the antivirus tracks program activity in real time. If a program begins to behave suspiciously (for example, downloads hidden components or massively sends network packets), it is blocked regardless of its code.
- Cloud security — the system sends suspicious files to the manufacturer's remote servers for instant analysis (sandbox). This reduces the load on the local device and speeds up the response to new threats.
Main types and classification
Antivirus software is classified by purpose and architecture:
- By type of protection: Scanners (launched on demand for a one-time check), Monitors (resident programs that protect the system in the background 24/7) and Comprehensive Internet Security packages, which include antispam, VPN and password manager modules.
- By target audience: Solutions for home users (free and shareware) and corporate products (EDR/EPP) with centralized server management, allowing administrators to manage security policies on all workstations of the organization.
- By licensing in Russia: In the context of import substitution, foreign software (conditionally available) and domestic antiviruses included in the Register of Domestic Software (for example, Kaspersky, Dr.Web) are distinguished, which is critically important for state structures and CII facilities under 187-FZ.
The choice of antivirus protection architecture is often discussed at the stage of design and development of automated systems, since this affects the load on servers and the requirements for data storage systems for storing quarantine copies and logs.
Why it is important to use an antivirus
Using even a free antivirus repeatedly reduces the risks of financial losses and data leaks. Even if the device is equipped with built-in protection tools (such as Microsoft Defender), enhanced protection is required to work with the digital ruble and the Fast Payment System (FPS). An infected device can become a "gateway" for compromising the entire corporate network, so installing and regularly updating an antivirus is a basic norm of information hygiene.
For deep protection of critical infrastructure, not only software but also hardware modules are used, as well as specialized cryptographic information protection tools (CIPF), working in conjunction with the antivirus to ensure the integrity of the electronic signature (ES).
To teach employees the rules of cybersecurity and the correct configuration of antivirus software, the comprehensive training service helps, which reduces the human factor — the main cause of successful virus attacks.
Frequently asked questions
How is an antivirus different from an antivirus scanner?
An antivirus scanner (for example, Dr.Web CureIt!) is a utility for a one-time system check without constant background protection. Full antivirus software is installed as a resident program and works in real time, blocking threats before they launch. In the corporate segment, monitors are also integrated with SIEM systems for centralized collection of security events, which is important for information security monitoring centers (SOC).
Why is it important in Russia to choose an antivirus from the Software Register?
Choosing an antivirus included in the Register of Domestic Software guarantees compliance with legal requirements (152-FZ, 187-FZ) and the absence of the risk of sudden termination of support (as happened with many Western vendors). This is critical for state structures and critical information infrastructure facilities. Within the framework of import substitution, domestic antiviruses provide technical support and database updates even under sanctions restrictions.
What are the main signs of a virus infection?
Key signs of infection: sudden slowdown of the system, processor overheating without visible reasons (hidden miner), the appearance of unknown files or the disappearance of documents, as well as disabling of the antivirus software itself or the impossibility of updating it. If you notice this, immediately disconnect the device from the network and run a check with a portable scanner. In corporate networks, such incidents require immediate response and isolation of the segment through network firewalls.
How to choose an antivirus for a weak PC?
For weak PCs (1-2 GB RAM) it is better to choose "light" solutions that minimize the load on the processor and disk subsystem. Pay attention to cloud antiviruses — they shift the main analysis load to the provider's servers. It is also worth disabling unused modules (antispam, parental control). Consultation on selecting the optimal configuration can be obtained within the security systems design service.
Why do you need an antivirus on your phone?
Smartphones are also vulnerable to Trojans, spyware and phishing applications. A mobile antivirus scans installed applications, blocks dangerous links in SMS and protects confidential data used to log in to the Fast Payment System (FPS) or confirm operations via the Electronic Signature. Built-in OS tools are often insufficient against sophisticated targeted attacks.
How does an antivirus interact with CIPF?
An antivirus and cryptographic protection tools (CIPF) work in a pair: the antivirus scans files before CIPF begins to encrypt or sign them. If the antivirus detects malicious code during the operation of the crypto gateway, this will prevent the leak of encrypted data. The compatibility of the antivirus with specific CIPF is checked during attestation testing of informatization facilities. For the study of related concepts, we also recommend familiarizing yourself with Antispam filter, SAZ and SDZ.
Other terms in «Information Security»
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Antivirus software
Antivirus software is a class of software tools for detecting, blocking and removing malicious code, providing real-time protection of devices against viruses, Trojans, ransomware and cyberattacks.
All categories
Design and development of information systems
Design and development of automated information systems.
Installation and maintenance of engineering systems
Installation, commissioning and maintenance of engineering systems, training on crypto tools.
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Unified protection system in geographically distributed data centers.
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