Vidar: string obfuscation
Vidar profileVidar added string obfuscation based on a virtual machine and a custom stream cipher to make detection and analysis harder. Zscaler
(FUD)
Malware or a crypter that the seller claims no antivirus engine detects on scanning services.
“FUD” is a marketing label: crypter sellers promise that a file passed through their product does not match any signature at the time of scanning. This is temporary; signatures are added as the file spreads. MITRE ATT&CK
Evading signature-based detection does not mean evading behavior-based detection; what the file does when it runs is still visible. MITRE ATT&CK
The payload is passed through a crypter; a separate shell is produced for each customer. MITRE ATT&CK
The seller checks the file on scanning services that do not share samples and shows the result to the customer.
Once the file starts being detected, a new shell is produced.
Vidar added string obfuscation based on a virtual machine and a custom stream cipher to make detection and analysis harder. Zscaler
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