Creating a new scheduled task that will launch shell.cmd every minute:
schtasks /create /sc minute /mo 1 /tn "eviltask" /tr C:\tools\shell.cmd /ru "SYSTEM"
Note that processes spawned as scheduled tasks have
taskeng.exe process as their parent:
Monitoring and inspecting commandline arguments and established network connections by processes can help uncover suspicious activity:
Also, look for events 4698 indicating new scheduled task creation:
Note that when using schtasks for lateral movement, the processes spawned do not have taskeng.exe as their parent, rather - svchost:
schtasks /create /sc minute /mo 1 /tn "eviltask" /tr calc /ru "SYSTEM" /s dc-mantvydas /u user /p password