A new malvertising chain that uses multiple payloads to steal confidential information from the victim’s machine and to encrypt their files with GandCrab Ransomware.
Threat actors using the the Fallout exploit kit, a utility program that designedto exploit vulnerabilities in ports, softwares and to deploy backdoors in vulnerable systems.
Malwarebytes security researchers observed a threat actor using the Fallout exploit kit to distribute Vidar information stealer and the secondary payload as GandCrab ransomware.
The malware identified as Vidar has stealer capabilities and it can be customized based on the threat actors requirements.
Researchers noted that Vidar is available for Sale, a single license cost $700, along with usual credit card numbers and passwords stealing capabilities it includes capabilities to steal passwords form digital wallets.
Once the vidar executed in the client machine it will search for the data specified in the profile connfiguration and if it founds the relevant data then it immediately send the databack to C2 server via an unencrypted HTTP POST request.
It steals the following system details that includes specs, running processes, installed applications, victim IP address, country, city, and ISP. Then it stores the data in the information.txt file and sends back to the attacker.
After extracting the information from client machine, Vidar loads the secondry payload via its command and control server.
“Within about a minute after the initial Vidar infection, the victim’s files will be encrypted and their wallpaper hijacked to display the note for GandCrab version 5.04.”
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