Social Engineer Toolkit is an open source tool to perform online social engineering attacks. The tool can be used for various attack scenarios including spear phishing and website attack vectors. Social Engineer Toolkit works in an integrated manner with Metasploit. It enables the execution of client-side attacks and seamless harvesting of credentials. With Social Engineer Toolkit, one can backdoor an executable and send it to the victim. It can automatically create fake login pages of a given website and spawn a server to listen to returning connections.