Attacker nowadays using new sophisticated techniques to compromise the targets by evading the security software and keep increasing the compromise success ratio.
Unlike previous infection Word document, Script, JAVA files and the current method of infection are used by new IQY file type an Excel Web Query file that is used to download data from the internet.
The targeted FlawedAmmyy malware campaigns have affected the banking sector and automotive industries.
FlawedAmmyy Malware Infection Process
A body of the mail content prompt victims to click and open the attached PDF file that drops embedded IQY file.
A script that works along with the PDF file helps to export the IQY files from PDF using a function called “exportDataObject” and the file export process continue by display a ‘open file’ dialog box.
According to QuickHeal research, The script inside of the PDF file contains “cName” parameter is a required input and the specific file attachment that will be exported. A nLaunch value of “2” directs acrobat to save the file attachment to a temporary file and then asks the operating system to open it. This is how the code is used to open the attachment file in PDF.
Once user click OK then the file will be opened in .iqy files that will lead to retrieving the content from the URL in the file but user needs to enable the security checks.
After enabling the security concern checks then IQY file download at %temp% location of victim machine and executed and the PowerShell Process will begin.
Finally, the PowerShell script will download the exe files and execute the backdoor FlawedAmmyy that performs various malicious activities such as let attack allow to remotely control the machine, manages the files, captures the screen.