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Vidar Stealer Unmasked: Code Signing Abuse, Go Loaders and File Inflation
July 7, 2026 · Unit 42 · Severity: MEDIUM
This article reveals a cybercrime campaign that combines a loader-as-a-service framework with DLL sideloading using a Go-compiled fake MpClient.dll. This novel evasion layer helps the Vidar Stealer malware avoid detection.
Key Takeaways
- Cybercrime campaign uses loader-as-a-service and DLL sideloading for evasion.
- Go-compiled fake MpClient.dll enables a novel evasion layer combination.
- Vidar Stealer leverages code signing abuse and file inflation techniques.