A new type of infected “.DOCX” document can steal all your passwords

Many email-based attacks include malicious Microsoft Office attachments that require macro enabling to succeed, but this is not a requirement anymore. Cybersecurity researchers just found out a new attack that uses malicious Office attachments that are macro-free. The flaw is used by the cybercriminals to steal credentials from the victim’s email, FTP, and browsers.

When a victim opens the attachments, there are no warnings or pop-ups to alert the victims. This is possible because every Word attachments use a malicious four-step infection process that exploits the Office Equation Editor vulnerability CVE-2017-11882.
This malware infection starts with a “.DOCX” formatted attachment that is delivered through a spam campaign using the Necurs botnet.

Every spam email uses this four subject lines: “TNT STATEMENT OF ACCOUNT”, “Request for Quotation”, “Telex Transfer Notification” and “SWIFT COPY FOR BALANCE PAYMENT”. In each email, there is an attachment named: receipt.docx.

The four-step infection process starts with the opening of the “.DOCX” file. This opening triggers an embedded OLE object which contains external references.
The second step of the infection consists in “.DOCX” file triggering the download and execution of an RTF file from this address hxxp://gamestoredownload[.]download/WS-word2017pa[.]doc.

The downloaded file is the one that exploits the Office Equation Editor vulnerability CVE-2017-11882, it does this by inserting and editing complex equations as OLE items in Microsoft Word documents.
In the third step, the text inside the RTF file is decoded, and it triggers an MSHTA command line that downloads and executes an HTML executable HTA file.
The last step is this HTA file that contains an obfuscated PowerShell Script that is used to download and execute the Password Stealer Malware.

This Password Stealer Malware can steal credentials from email, FTP, and browsers.
We recommend the install of the latest Microsoft security patch because it will make the vulnerability: CVE-2017-11882 unuseable also is highly recommended the install an antivirus solution in every device for robust cybersecurity protection.

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