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[shor6284]

today i will show you how to make an %100 real anti-virus with HASH CODES

U need 2 TextBox
2 button
1st button = open
2nd button = scan

1st TextBox will be program's hash
2nd textbox will be virus hashes

Code: Select all

Imports System
Imports System.IO.FileStream
Imports System.Security.Cryptography
Imports System.Text
Imports System.IO 

and button1(open button) codes:

Code: Select all

Dim dialog As New OpenFileDialog
        dialog.CheckFileExists = True
        dialog.CheckPathExists = True
        dialog.ShowDialog()

        Dim provider As New MD5CryptoServiceProvider
        Dim inputStream As New FileStream(dialog.FileName, FileMode.Open, FileAccess.Read, FileShare.Read, &H2000)
        provider.ComputeHash(inputStream)
        Dim hash As Byte() = provider.Hash
        Dim builder As New StringBuilder
        Dim num As Byte
        For Each num In hash
            builder.Append(String.Format("{0:X2}", num))
        Next
        Me.TextBox1.Text = builder.ToString

and scan button codes:

Code: Select all

If TextBox2.Text.Contains(TextBox1.Text) Then
            MsgBox("Virus Found")
        Else
            MsgBox("Safe File")
        End If

[MANSQN]

nice. but how does this catch viruses?

[mandai]

This is supposed to use MD5 to catch viruses, but the smart ones will be able to bypass this.

[clanc789]

This is supposed to use MD5 to catch viruses, but the smart ones will be able to bypass this.

Mandai wrote a program which changes its own MD5 hash so it is not a really good virus scanner.

[Proprogrammer]

To make a really good virus scanner you will need to make a program that can decompile .net + C# apps then look through the code for maleware coding, which is what real antivirus's do + hashes of course. And For C++ they look at the api's and what the application calls into, but of course if a virus is made in C++ it is harder to detect.

[Axel]

+ Check what it sends to the internet with a sniffer which I know is pretty damn hard to make

[mandai]

If you start checking the internet connection then that would be more of a firewall.

[Axel]

What antivirus doesn't have that feature ?

[clanc789]

Axel is right. All AV's nowadays have it...