An unpatched bug thatmalicious files into the victim’s system.
This flaw affected Office 2016 and older versions and it will not produce any security warning while victims opening the document.
Researchers built a Proof-of-concept for this attack using youtube video link with word document and demonstrate the infection process.
This flaw allows let an attacker execute the powerful malware or ransomware also they will use the evasion technique to avoid the security software detection.
How Does This Attack Works
Malicious hackers having an embedded video link inside of the Microsoft word document and send to victims via phishing mail that trick users to open it.
Embedded video contains a link that pointed to YOUTUBE and the hidden html.
According to cymulate, This attack is carried out by embedding a video inside a Word document, editing the XML file named document.xml, replacing the video link with a crafted payload created by the attacker which opens Internet Explorer Download Manager with the embedded code execution file.
Embed an online video option within the word document and link any YouTube video and save the document.
Later unpack the word document using unpacker or change the extension as
Word document contains a file called
A researcher from cymulate
Block Word documents containing the tag: “embeddedHtml” in the Document.xml file of the word documents.
Block word documents containing an embedded video.