Small Sieve Malware Registry Run Key Persistence
This rule detects the creation or modification of a registry run key that exhibits characteristics associated with the 'Small Sieve' malware. Specifically, it looks for a registry path containing '\Microsoft\Windows\CurrentVersion\Run\' combined with either the intentional typo 'Microsift' in the TargetObject or the string '.exe Platypus' in the Details field. These indicators are known to be used by the Small Sieve malware for persistence.
Sigma

