A recent surge in ValleyRAT activity that combines RC4-encrypted payloads, Donut-generated shellcode, and in-memory execution via suspended rundll32 processes to evade detection. First named by Proofpoint in 2023, ValleyRAT continues to evolve: LevelBlue’s telemetry shows a marked increase in successful detections beginning May 2025 and accelerating into 2026. The threat now presents through two primary […]
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