Base64 Encoded PowerShell Command Decoding
This rule detects the use of the '::FromBase64String(' function in a command line, which is a common method for decoding Base64 encoded strings in PowerShell. Adversaries often use Base64 encoding to obfuscate malicious commands or payloads, making them harder to detect by signature-based defenses. This detection aims to identify attempts to deobfuscate such encoded content, typically as part of a larger attack chain involving defense evasion and execution.
Sigma
