In computing, a backdoor is a secret point of entry to a computer program or computer. Legitimate backdoors may be created by a system developer, but more commonly they are used by hackers for penetrating a computer over a network. The most popular method of establishing a backdoor to a computer is through the 'Backdoor Mail Spam' in which an unsolicited email is sent to a victim with a
backdoor program attached to it. This backdoor program will be disguised (a Trojan) pretending to be perhaps a computer game or a screensaver. Further, the email may pretend to originate from a trusted source, such as the mail program of the network or a well-known computer company. When the recipient executes the attachment, the backdoor program installs itself secretly onto the computer and monitors a predefined port on the network waiting to allow a hacker in 'through the back door'. Research Backdoor
JBMail is a unique POP3 mail reader for the Windows operating system which gives the user direct access to his or her mailbox. You can view, preview, delete, save, print, retrieve attachments, or delete junk mail. JBMail gives you fast access to your mail, because it lets you manipulate e-mails without having to first download them. With its junk mail filtering, it's an excellent way to kill large amounts of spam. 'Purge' and 'partial' access modes let you get into very full mailboxes.
JBMail is useful for anybody who gets lots of mail, and even useful for technical support people trying to fix mailboxes. Research JBMail
The Win32.Bagle virus, also known as the Win32.Beagle virus is a family of polymorphic mass-mailing viruses that infect computers using the Windows operating system and use their own built in SMTP engine to spread through emails, sending emails to addresses found in files on the infected computer. The virus arrives as an attachment to an email which purports to come from one of management, administration, staff, anti-virus, anti-spam, no-reply or support at the recipient domain. The attachment is a randomly named .exe file, stored inside a .zip file, a .rar file, or a .pif file. The .zip and .rar files file may be password-protected. The file name, without the extension, may be one of the following: Attach, Details, Document, Encrypted, Gift, Info, Information, Message, MoreInfo, Readme, Text, TextDocument, details, first part, pub document, or text document. Upon being executed, the attachment copies itself to the Windows system directory (typically \windows\system or \windows\system32) as 'winupd.exe' and as winupd.exeopen and as
winupd.exeopenopen which is either a copy of the virus, or a password-protected zip or rar file that contains the virus in which case the file winupd.exeopenopenopen which is a .bmp file containing an image of the password for the zip/rar file is also created. The registry is also amended with the value 'winupd.exe'='%System%\winupd.exe' being added to the registry key HKEY CURRENT USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run so that the virus starts when the Windows operating system starts. The virus also attaches itself to .exe files which it then tries to copy through file sharing systems such as Kazaa and iMesh and opens a backdoor, listening on TCP port 2556. Research Bagle
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