MALWARE TYPES TRB CSI › Cyber Security › malware types,

MALWARE TYPES

Malware = Malicious Software Malware என்பது user permission இல்லாமல் system-ல்: Damage செய்ய Data steal செய்ய Spy செய்ய Files lock செய்ய Password capture செய்ய System control எடுக்க உருவாக்கப்படும் harmful software. Simple Definition Malwa…

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MALWARE TYPES Malware என்பது computer, mobile, network அல்லது data-க்கு……

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Definition

Malware = Malicious Software Malware என்பது user permission இல்லாமல் system-ல்: Damage செய்ய Data steal செய்ய……

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Simple Explanation

Normal software: User ↓ Softw……

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Explanation
Example

MS Word Browser Calculator Malware: Attacker ↓ Malware ↓ Victim C……

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Explanation
Major types of malware

முக்கியமாக: Virus Worm Trojan Horse Ransomware Spyware Adware Root……

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Explanation

1. VIRUS…

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Definition

Virus என்பது மற்றொரு file அல்லது program-க்கு attach ஆகி, அந்த h……

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Flow

Infected File ↓ User Opens Fi……

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Real Life Example
Example

ஒரு infected .exe file: game.exe User அதை run……

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Important

Virus பொதுவாக user action தேவ……

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Explanation
Example

Opening infected file Running……

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List

1. WORM…

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Definition

Worm என்பது self-replicating malware. இ……

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Flow

Computer A ↓ Worm ↓ Network ↓……

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Important
Important difference

Virus Host file தேவை. Worm Ho……

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Comparison

1. TROJAN HORSE…

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Definition

Trojan என்பது useful அல்லது legitimate software போல disguise ஆகி……

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Simple Explanation

Outside: Free Game Inside: Ma……

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Flow

Fake Useful Software ↓ User Downloads……

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Important

Trojan: Self-replicate செய்யாது. User deceptio……

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Important

1. RANSOMWARE…

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Definition

Ransomware என்பது files அல்லது computer syst……

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Flow

Ransomware Infection ↓ Files Encrypte……

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Explanation
Key word

Ransom = பணம் கேட்டு பிடித்து……

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Explanation
Types

Crypto Ransomware Files encrypt செய்கி……

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Explanation

1. SPYWARE…

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Definition

Spyware என்பது user activity-ஐ secr……

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Explanation
What can it collect?

Browsing history Username Password……

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Flow

Victim ↓ Uses Computer ↓ Spyware……

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Flow

1. KEYLOGGER…

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Definition

Keylogger என்பது keyboard-ல் user type செய……

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Real Life Example
Example

User types: Username: nagarajan Password: Tesla@369 Keylog……

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Important

Keylogger என்பது spyware-ன் ஒ……

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Important

1. ADWARE…

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Definition

Adware என்பது unwanted advertisements-ஐ continuously display செய்யும் software. அனைத்த……

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Real Life Example
Example

Browser open செய்தால்: Popup ……

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Real Life Example

1. ROOTKIT…

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Definition

Rootkit என்பது attacker-க்கு system-ல் privileg……

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Simple Explanation

Attacker system-க்குள் இருக்கிறார். ஆனால் user அல்லது security s……

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Important

Rootkit முக்கிய நோக்கங்கள்: Hide malw……

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Important

1. BACKDOOR…

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Definition

Backdoor என்பது normal authentication/security ……

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Flow

Normal: Username ↓ Password ↓ Authentication ↓ Acc……

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Flow

1. BOT MALWARE…

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Definition

Bot malware infected computer-ஐ attacker remotely control செய்ய அனுமதிக்கிறது. ……

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Flow

Attacker ↓ Command & Control ↓ --------------------- ↓ ↓ ……

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Flow

1. LOGIC BOMB…

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Definition

Logic Bomb என்பது குறிப்பிட்ட condi……

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Real Life Example
Example

IF Date = 01-01-2027 THEN Delete F……

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Explanation
Key point

Trigger condition → Malicious……

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Explanation

1. FILELESS MALWARE…

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Definition

Fileless malware traditional executable file install செய்யாமல் sy……

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Simple Explanation

Traditional malware: Malware File ↓ Hard Disk……

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Important

Fileless malware detect செய்வ……

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Important

1. SCAREWARE…

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Definition

Scareware என்பது fake security warning காட்டி user-……

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Real Life Example
Example

WARNING! Your computer has 125 viruses! Pay……

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Real Life Example

1. CRYPTOJACKING MALWARE…

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Definition

Victim permission இல்லாமல் அவருடைய: CPU GPU Electri……

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Flow

Malware ↓ Victim CPU/GPU ↓ Cr……

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Explanation
Malware classification

Malware-ஐ behaviour அடிப்படையில் classify செய்யலாம். Replication Based Virus Worm Disguise Based Trojan Data ……

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Explanation

[SPYWARE vs KEYLOGGER]…

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Explanation

[VIRUS vs RANSOMWARE] Virus-ன் primary behaviour: Infect……

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Explanation
Malware infection methods

Malware system-க்கு எப்படி வர……

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Explanation

1. Email Attachments…

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Explanation

invoice.exe document.zip…

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Explanation

1. Fake Websites 2. Pirated Software 3. Malicious Links 4. ……

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Explanation
Malware life cycle

Malware Creation ↓ Distribution ↓ Infection ↓ ……

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Important
Important term: payload

Malware-ன் actual harmful act……

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Explanation
Example

Malware enters system ↓ Paylo……

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Common Mistake

Wrong Virus and Malware are the same. Correct Malware என்பது broad category.……

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Remember

All computer viruses are malw……

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Memory Trick

Main malware types நினைவில் வைத்துக்கொள்ள: V W T R S A R K B V ……

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TRB Point

Virus Needs host file Worm Self-replicates through network Trojan Disguised as legitimate software Ransomware……

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Interview Point
Question

What is the difference between Virus, Worm and Trojan? Answer: A virus attaches itself to a host file and usu……

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MCQ

Which malware requires a host……

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MCQ

Which malware can self-replic……

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MCQ

Malware disguised as legitima……

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MCQ

Which malware encrypts files ……

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MCQ

Which malware records keyboar……

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MCQ

A collection of compromised s……

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MCQ

Malware triggered by a partic……

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MCQ

Which malware is mainly desig……

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MCQ

Which of the following is sel……

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MCQ

All viruses are:…

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Practice

Define Malware. Explain Virus. Explain Worm. Differentiate Virus and Worm. What is Trojan Horse? What is Rans……

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Summary

MALWARE | ├── Virus │ └─ Attaches to host file | ├── Worm │ └─ Self-replicates | ├── Trojan │ └─ Looks legiti……

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