In the past, third party software utility is required to open an ISO file, but modern versions of Windows (Win 8 & later) feature a native ISO mounting tool. This may be due to the fact that ISO’s tend to be larger in size.
ISO file is used in this attack as many email gateway scanners don’t scan ISO file attachments properly. They’re also very useful for distributing large programs over the internet as an ISO image can handily contain all of a program’s files in a single file. ISO files are commonly used to create a backup of a CD or DVD. ISO file is named to look like an image file and the contents of the email messages vary but spoofed to look like it’s coming from one of its vendors and encourages user to open the attached file.Īn ISO file (referred as an ISO image) is an archive file that contains all the information that would be written to an optical disc. SonicWall Capture Labs Threat Research team has observed a huge phishing campaign that spreads NanoCore Remote Access Trojan (RAT) through malicious attachments.Īs with many other attacks, this campaign starts with a phishing email that distributes the malicious ISO malware as an email attachment.
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