Fileless Malware Execution with Microsoft PowerShell Fileless malware is an attack that occurs by methods such as embedding malicious code in scripts or loading malware into memory without writing to disk. PowerShell can run a script directly in memory; hence, it is increasingly being used to perpetrate fileless attacks.
Article Link: http://www.viruss.eu/virus-news/fileless-malware-execution-with-powershell-is-easier-than-you-may-realize/