GEN:SID | 1:801 |
Message | Virus - Possible Worm - doc.vbs file |
Summary | This rule has been placed in deleted.rules. It has been superceded by sid 721.
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Impact | Mail worms may spread rapidly because users execute them.
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Detailed Information | Windows systems are often configured not to display file extensions. By adding a second extension, users get confused and think that an executable is a WORD document - e.g. resume.doc.vbs gets displayed as resume.doc but is a visual basic script and not a WORD document.
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Affected Systems | |
Attack Scenarios | Famous worms (ILOVEYOU, KOURNIKOVA) are based on this method. Warning: A WORD document is in now way more secure than a visual basic script. Wrongly configured antivirus software my ignore this files and let a macro virus pass.
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Ease of Attack | Very easy. One needs to attach a file and hope that it gets executed.
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Corrective Action | Use antivirus software. Configure mail clients securely, especially when using windows desktops. Educate your mail users. Deny all attachments at the gateway if you can.
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Additional References | |