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Recently there have been a lot of people distributing spammers, or at least that's the way it seems. Both here, and on other forums.
Well, let me explain to you a little bit about spammers/bombers and how they work.
Let me start by saying that virtually all these programs are made in VB.NET or C#.NET (mostly VB, I'm fairly sure). It doesn't really matter, since the concept behind them is exactly the same, with only slight syntax differences.
Continuing on with that, creating a GUI is EASY in these languages. When you install Visual Studio Express (or Ultimate if you really want to be that way) you'll get a GUI builder. Its LITERALLY drag and drop. To make it look "cool" or "sexy" or "unique" - or whatever the hell they call it - they're just modifying a couple properties in a very easy to use property editor.
If they appear to have a complete custom theme, then there's a chance they used GDI+ to create it, but even that isn't extremely difficult.
For the email bomber all you're doing is sending an email, except this email is typically sent every time a timer control ticks, or its run by a simple loop. After creating a timer and setting the interval, you can easily just add in "Imports System.Net.Mail" or "using System.Net.Mail;" and then use the SmtpClient and MailMessage objects to send and create your mail.
The concept is the same for an SMS bomber. You set it up in the same exact way. The thing about SMS, is that most carriers will provide a cell phone with a custom email address, so that when an email is sent to that custom email address, the email is actually sent to the phone in the form of a text message. While unimportant to my point, this will also provides a phone with a way to send a "text message" to an email addresses. All you have to do is discover the domain of the email address, then it'll be something like: [email]
[email protected][/email]. All you have to do is spam the emails to the email address matching the phone number, and you're good.
As for text spammers, all they're doing is using sendkeys. They take in your message through a textbox and use the send method of SendKeys, like so: System.Windows.Forms.SendKeys.Send("The keys to send")
Of course, since you're building a Windows Form application, in most cases you can simply put "SendKeys.Send("keys to send")".
As you can see, there is nothing particularly complex or confusing about such applications, in truth, they're very basic and take no longer than an hour or two to develop. For emails, its a matter of sending an email constantly based on a timer, with SMS its a matter of sending the email to the email address matching the phone, and for text spammers, all you have to do is use SendKeys.
There's a link to a website in my signature, if you check out the Programming section on it you can find a post containing a source code for both an SMS and Email bomber.