Another kind of malware —short for malicious software —puts a program onto your computer that operates without your knowledge or consent, or performs a task without your awareness. Malware may look innocent enough, may even be a Word document or PowerPoint presentation, or any program that has macro functionality, but it will secretly install an unauthorized program. For example, malware may be a version of the Trojan Horse talked about in Chapter 6 . Once this software is installed on your machine, it can feed every keystroke you type back to the attacker, including all your passwords and credit card numbers.