![]() ![]() 'Anti-malware' is intended to be a broader description than 'antivirus,' but antivirus has broadened in common usage to describe the same. Macro viruses deliver a payload when the file is opened, and the macro runs. The term antivirus refers to computer viruses that were early online threats, and anti-malware refers to the term 'malware,' which is an umbrella term for any kind of malicious software (including viruses). Microsoft Office files can run macros, and these macros can be used to download additional malware or run malicious code. is a portion of virus code that is unique to a particular computer virus. These malicious programmes spread across a network or other systems by copying themselves or injecting code into critical computer resources. When the system boots or the programme runs, the computer virus is activated. To persist on a system, a threat actor uses file infector viruses to inject malicious code into critical files that run the operating system or important programmes. Polymorphic viruses make it more difficult for an antivirus to detect and remove them. Malware authors can use polymorphic code to change the programme’s footprint to avoid detection. These computer viruses can also remain dormant until a specific action is taken or a timeframe passes. When a user executes a seemingly harmless file attached with malicious code, direct action viruses deliver a payload immediately. The code’s malicious activity could damage the local file system, steal data, interrupt services, download additional malware, or any other actions coded into the program by the malware author. ![]() However, unlike a computer worm, viruses require human interaction to replicate. A computer virus is a malicious application or authored code used to perform destructive activity on a device or local network. This malware may stay dormant until a specific date, time, or a user performs an action. Cyber Hub Secure Users & Access What is Malware What Is a Computer Virus What Is a Computer Virus A computer virus is a type of malware that can replicate itself, spreading to infect new systems. Resident VirusĪ virus that can access computer memory and sit dormant until a payload is delivered is considered a resident virus. The site could be a phishing site or an adware page used to steal data or make money for the attacker. Browser HijackerĪ computer virus that can change the settings on your browser will hijack browser favourites, the home page URL, your search preferences and redirect you to a malicious site. Most browsers have defences against malicious web scripts, but older, unsupported browsers have vulnerabilities that allow an attacker to run code on the local device. The virus is activated when users plug in the USB device and boot their machine. Attackers will usually spread this computer virus type using a malicious USB device. A boot sector virus damages or controls the boot sector on the drive, rendering the machine unusable. ![]() Your computer drive has a sector solely responsible for pointing to the operating system so that it can boot into the interface. ![]()
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