New Malicious RTF document is infected with NetwiredRC and Quasar RAT. This malicious RTF document is forcing its victims to execute the VBA macro code. Cybercriminals use many ingenious methods to lure users into executing malicious documents.
This time we have observed a unique approach: this malicious RTF documents force victims to execute an embedded VBA macro this execution runs the infection cycle by installing Quasar RAT and NetWiredRC payloads. It forces victims by showing repeated macro warning popups even if the victim has clicked the Disable Macros button during the first warning, and there is no way to stop it except clicking them or force-quit Word.
To do this cybercriminals used \objupdate control to embedded Excel sheet objects into infected RTF document. The function triggers a macro code embedded Excel sheet to execute while the RTF document is being loaded in the MS Word application, by doing this it causes the multiple macro warning popups to appear.
The function \objupdate control is used in vulnerability CVE-2017-0199. But regarding this malicious document is not using this or any other vulnerability.
This malware also permanently enables macros for Word, PowerPoint, and Excel by doing registry modification.
This is the steps that VBS code performs:
• Close all running instances of Microsoft Word and Excel process.
• Download final payload and save it in %PUBLIC% folder with name svchost.exe.
• Execute the downloaded payload.
• By doing registry modification, it enables macro and disable protected view settings for Microsoft Word, PowerPoint, and Excel
• Create a scheduled task with the name: WindowsUpdates to run this payload: svchost32.vbs after 200 minutes.
• Delete WindowsUpdate scheduled task
• Download the payload and save it in %PUBLIC% folder with name svchosts.exe.
NetwiredRC and QusarRat malware as final payloads, both are Remote Admin Tools (RAT). QusarRat can be used to the remote webcam, remote shell, and keylogging. NetwiredRC can be used to find the file, remote shell, keylogging, screen capture, password stealing, etc. To stay safe from this type of threats we recommend the download of files only from trusted sources, also the presence of a cybersecurity solution like antivirus or firewall in every device that is connected to the internet is a must.
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