Operation Poisson: Suspicious Scheduled Task Persistence via Remote Session

Ibrahim Saud@tektrix

•updated Jun 30, 2026•0•0•3

This rule detects the creation of scheduled tasks using either schtasks.exe or PowerShell (Register-ScheduledTask) that exhibit high-risk indicators. These indicators include executing files from suspicious locations (AppData, Temp, or specific user-writable directories), the use of encoded PowerShell commands, or initiation by common remote access tools (sshd, ssh, or mstsc). This behavior is often associated with persistence mechanisms used by adversaries.