What is Macro Virus and How They Affect Computer Systems?
Last Updated :
23 Jul, 2025
Hackers use various methods to attack computer systems, and one of the most dangerous among them is the virus. A virus is a type of malicious code that can cause harm to your computer in many ways. In this article, we will discuss what is macro viruses and how they affect computer systems.
What is Macro Virus?
Macro viruses a malicious code specifically designed by the hacker or attacker using the macro language (A language that is used to build applications such as Microsoft Word, Excel, or PowerPoint). Macro viruses attach themselves to documents and spreadsheets, and when these files are opened or edited, they infect other documents as well. The dangerous thing about macro viruses is that they can infect any computer, regardless of the operating system it runs on. This means that whether your computer is running Windows, macOS, or Linux, it is vulnerable to a macro virus attack.
How Does a Macro Virus Work and Spread?
A full-scale infection is a sort of malware that targets full-scale programs in applications like Microsoft Word or Succeed. This is the secret, and it spreads:
- Creation and Implanting: The infection is written in the full-scale programming language of the application it targets (e.g., VBA for Microsoft Office). It is inserted into a report or bookkeeping sheet as a full scale.
- Enactment: When a client opens the contaminated report or calculation sheet, the large-scale infection initiates. This commonly happens when macros are enabled in the application settings.
- Execution: When enacted, the full-scale infection can perform different vindictive activities, like defiling documents, erasing information, or introducing extra malware. It could likewise endeavor to take advantage of weaknesses or perform unapproved activities.
- Spreading: The infection frequently spreads by tainting different reports and calculation sheets on a similar framework. It can likewise utilize mechanized contents to email tainted records or different means to contacts recorded in the client's location book or in the archive's metadata.
- Proliferation: Tainted documents are shared or traded with others, either through email connections, shared networks, or different means, which prompts further spreading of the infection. In the event that beneficiaries open the contaminated archives and empower macros, their frameworks get tainted too.
Other Ways Macro Viruses May Spread
Notwithstanding email connections and shared networks, full-scale infections can spread through a few different techniques:
- Social Designing: Large-scale infections frequently depend on friendly design strategies. For instance, they might be implanted in records that seem, by all accounts, to be significant or tempting, like solicitations, reports, or continuing, provoking clients to open them.
- Record Sharing Administrations: Contaminated documents can be shared through document sharing stages or distributed storage administrations. Assuming clients download and open these records, their frameworks might get contaminated.
- Malevolent Sites: Full-scale infections can be circulated through sites that host or have connections to contaminated archives. Clients who download records from these destinations may coincidentally spread the infection.
- Network Drives and Shared Envelopes: In the event that a full-scale infection contaminates a report put away on a common organization drive or in a typical envelope, different clients getting to these common assets can get tainted when they open the contaminated records.
- Removable Media: Infection-contaminated documents can be moved through USB drives, compact discs, or other removable media. At the point when the media is associated with another PC and the contaminated record is opened, the infection can spread.
What Can Macro Viruses Do?
Large-scale infections can play out different malevolent exercises based on their plans and expectations. A few normal activities they can do include:
- Information Debasement: They can ruin or adjust information in records, accounting sheets, or data sets, prompting information misfortune or irregularity.
- Document Erasure: Full-scale infections can erase records or envelopes on the tainted framework, possibly prompting huge information misfortune.
- Framework Change: They might adjust framework settings or arrangements, which can disturb typical tasks or decrease framework security.
- Information Burglary: Some full-scale infections are intended to take delicate data, like individual information, passwords, or monetary data.
- Spread to Different Records: They can consequently contaminate different archives or formats, spreading the infection to different clients who open these documents.
How Have Macro Viruses Evolved?
Large-scale infections have advanced altogether since their initial days, adjusting to changes in programming and security rehearsals. This is a gander at the way they've created it:
- Expanded Refinement: Early large scale infections were generally basic, yet present day variations are more intricate. They can utilize advanced methods to avoid location and sidestep safety efforts, like encryption, jumbling, and polymorphism.
- Improved Spread Components: Early full scale infections essentially spread through email connections and shared reports. Presently, they likewise exploit web-based entertainment, distributed storage, record sharing administrations, and even adventure weaknesses in archive frameworks to spread all the more.
- Reconciliation with Other Malware: Current full-scale infections frequently work related to different sorts of malware. For instance, they could introduce ransomware, keyloggers, or spyware, increasing their effect and likely harm.
- Focusing on Unambiguous Applications: While early full scale infections were for the most part centered around Microsoft Office items, more up-to-date variations can focus on a scope of applications that utilize macros, including other office suites and custom applications with large-scale usefulness.
- Improved Social Designing: Current large scale infections utilize modern social design strategies to fool clients into empowering macros. They might show up as genuine or critical records to improve the probability of enactment.
What are Examples of Macro Viruses?
A few eminent full-scale infections have had an effect throughout the long term. Here are a few models:
- Idea (1995): Frequently thought to be one of the main full-scale infections, Idea was spread through Microsoft Word archives. It exhibited the capability of large-scale infections and prompted expanded mindfulness and endeavors to further develop security.
- Melissa (1999): This infection spread through contaminated email connections. It utilized Microsoft Word macros to send itself to the initial 50 contacts in the client's location book, causing a broad disturbance and stopping up email frameworks.
- CIH (otherwise called Chernobyl, 1998): Albeit basically a record infector infection, CIH likewise had a full-scale part that could influence reports. It was famous for causing critical harm, including tainting information and rendering hard drives unusable.
- I Love You (2000): This infection spread through email with a headline perusing "I Love You." It involved a large scale in a connection to spread itself and, furthermore, overwrote records and defiled information on contaminated frameworks.
- Storm Worm (2007): Initially spread as a large-scale infection through email, it developed into a modern worm and botnet. It utilized social design strategies to fool clients into opening tainted email connections and turned out to be important for a huge organization of compromised PCs.
- Sasser (2004): Albeit basically a worm taking advantage of weaknesses in Windows, Sasser had full-scale capacities that permitted it to spread through reports and messages, showing the combination of large-scale and organization-based malware.
- Dridex (2014): Known for its financial trojan capacities, Dridex utilized large-scale infections in its beginning phases to disperse itself by means of tainted email connections. Taking financial certifications and other delicate information was planned.
What are Signs of a Macro Virus Infection?
Indications of a full-scale infection disease can change contingent upon the infection and its activities; however, normal markers include:
- Startling Conduct in Reports: Archives might show uncommon ways of behaving, for example, surprising arranging changes, modified or tainted content, or new macros.
- Successive Accidents or Mistakes: Applications that handle macros, such as Microsoft Office, may crash much of the time or produce blunder messages, particularly while opening or working with records.
- Surprising Movement in Email: Unforeseen or unexplained messages being sent from your location, particularly with connections or connections you didn't send, can be an indication of a large-scale infection. Check your sent items and contact list for indications of spam or spontaneous messages.
- Slow Execution: On the off chance that your framework turns out to be uncommonly sluggish, particularly while working with reports or running Office applications, it very well may be an indication of a large-scale infection influencing framework assets.
- New Reports or Formats: You could track down new or existing archives, layouts, or macros in your record framework or inside your applications, demonstrating that the infection has made or adjusted documents.
How are Macro Viruses Removed?
Eliminating large-scale infections includes a few moves toward guaranteeing the infection is completely destroyed and your framework is gotten. Here is a bit-by-bit guide:
- Detach from the Web: To forestall additional spread or information exfiltration, separate your PC from the web.
- Update Antivirus Programming: Guarantee your antivirus or anti-malware programming is fully informed regarding the most recent infection definitions. This permits it to perceive and eliminate the most recent dangers.
- Run a Full Framework Output: Play out a thorough sweep of your framework utilizing your antivirus programming. This will help distinguish, isolate, or eliminate any large-scale infections or related malware.
- Update Programming: Guarantee that your working framework, applications, and all products are fully informed regarding the most recent patches and security updates to forestall double-dealing of weaknesses.
- Change Passwords: Assuming the large-scale infection was intended to take delicate data, change your passwords for significant records, particularly in the event that you notice uncommon action.
How Does a Macro Virus Work and Spread?
Hackers can inject a specific type of computer virus called a macro virus into spreadsheets and documents. When a user opens or edits these files, the macro virus enters the system and starts infecting the system, as well as other files stored on the system. The most dangerous thing about macro viruses is their ability to replicate as fast as possible. When a user views or edits a file infected with a macro virus, the virus starts to replicate and attach itself to other documents on the same computer. If these infected files are shared with other users, the virus can spread to their computers as well. Once a macro virus enters a computer system, it starts infecting the system and causing serious damage in various type of ways, such as deleting files, modifying documents, stealing data, and many more.
Macro viruses are difficult to find and delete because they're written in a macro language(A language that is used to build applications such as Microsoft Word, Excel, or PowerPoint) and can hide in files that seem safe. Additionally, many antivirus programs may not detect macro viruses because they're not exactly viruses. Instead, they are categorized as malware or Trojan horses.
Other Ways Macro Viruses May Spread
- Macrovirus spread through removable disk or pendrives which needs to be attached to different system in order to share file or data.
- These spread when malicious application or files are downloaded from unknown sources or internet.
- These may spread from one computer to other connected within a network or topology during file sharing.
- Macro virus can replicate themself and spread and attach to all the files present in the system.
What Can Macro Viruses do?
- Macrovirus can delete the important files or data from the system.
- Macrovirus often formats the system leading to major losses.
- These can access the system and may breach the security by eavesdropping.
- These corrupt the system by manipulating system settings or data present over the system.
- Macrovirus spreads over the system and may lead to higher CPU utilization.
How to Macro Viruses Evolved?
Macroviruses have evolved over time from simply being attached only to MS office files to integrating with various malware or technical advancements and affecting all types of documents or files. Macrovirus have now learnt to defy antivirus software by slightly modifying the code when replicating to other system. Some macrovirus pause infecting the system for sometime so that they are not easily detected. Macrovirus can now spread/attach to other platforms like Dropbox and Gmail.
What are Examples of Macro Viruses?
- Concept Macrovirus - This is one of earliest version of macrovirus, which infected Word documents and used to infect system by attaching itself to .doc files.
- Melisa Virus - It is another famous version of macrovirus which spread through email attachments. This macrovirus used to be attached to word documents and sent itself to the first 50 contacts of Outlook mail.
- Laroux - It is first macrovirus that used MS excel to propogate and spread. It spreads by integrating itself into more files each time the host program is run.
- W97M/Thus - It targeted Word 97 users and used to manipulate or corrupt the data present on the system.
What are Signs of a Macro Virus Infection?
- Modification in content of files and data present in the system.
- Platforms like MS Word or Excel show error message or unexpected license expired messages.
- The permissions or settings associated with application is altered automatically.
- Your firewall service detects the infected files often raising notification to quaratine the files.
- Macrovirus degrade system performance as it replicates among the different files present with the system.
How are Macro Viruses Removed?
- One should delete the file infected with macrovirus, this is manually removing the macrovirus from system.
- There are many antivirus tools available to detect and remove the macrovirus.
- Restore or clean the computer to remove the infection and then restore the backup files which were not affected by it.
- As melisa virus spread through mail, one should remove suspicious mails to remove virus.
- The infected system should be isolated and prevent to transfer the data and message.
Preventive Measures
Users must take some security measures to protect themselves from macro viruses. The following list contains some of the most important security measures:
- It is very important to back up data regularly to reduce the risk of data loss.
- Take precautions when opening email attachments from unknown senders.
- Avoid downloading files from unreliable sources, such as .zip and .rar files, because these files may contain malicious programs hidden by attackers. Get software and files from reputable, verified sources only.
- Use an effective and up-to-date security suite and antivirus software to protect your device or computer from all known and unknown threats.
- To protect against recently disclosed vulnerabilities, keep your software and operating system up to date, and enable macro security settings in Microsoft Office applications to prevent macros from running without permission.
Conclusion
The risk associated with macrovirus can be mitigated by following best practices to prevent harms of macrovirus. This article will help you to understand the evolution of macrovirus since earliest version resulting in risk mitigation and preventing data loss. Macrovirus can cause serious harm to the system and needs to be detected at right time.
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