A new malvertising campaign being used on low quality web games and blogs is redirecting Asian victims to the RIG exploit kit, which is then quietly installing the Sodinokibi Ransomware. This new malvertising campaign is targeting Internet Explorer users from Vietnam, Korea, Malaysia and possibly other Asian countries. When browsing the web, the malvertising campaign will redirect users to a RIG exploit kit gateway that will attempt to exploit Flash vulnerabilities in the browser. If successful, a user will see Internet Explorer begin to crash and various alerts from the Windows Script Host as shown below.
This is because the exploit kit will execute a JScript command that downloads an obfuscated VBScript script. This VBScript will then download and install the Sodinokibi Ransomware, also known as REvil, on the victim’s computer. Once executed, the ransomware will begin to encrypt the victim’s files. As the exploit kit will install the ransomware without the user’s knowledge, other than the suspicious Internet Explorer crash, most users will not know they are infected until the ransomware has finished. They will then notice that they are unable to access their documents and that their desktop wallpaper has been changed to instructions telling the victim to open the ransom note.
Users are advised to restore from backups if at all possible rather than paying the ransom.