Suspicious Modification Of Scheduled Tasks
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About the rule
Rule Type
Standard
Rule Description
Detects when an attacker tries to modify an already existing scheduled tasks to run from a suspicious location Attackers can create a simple looking task in order to avoid detection on creation as it's often the most focused on Instead they modify the task after creation to include their malicious payload
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith "\schtasks.exe" AND (COMMANDLINE contains " /Change " AND COMMANDLINE contains " /TN ")) AND COMMANDLINE contains "\AppData\Local\Temp,\AppData\Roaming\,\Users\Public\,\WINDOWS\Temp\,\Desktop\,\Downloads\,\Temporary Internet,C:\ProgramData\,C:\Perflogs\,%ProgramData%,%appdata%,%comspec%,%localappdata%" AND COMMANDLINE contains "regsvr32,rundll32,cmd /c ,cmd /k ,cmd /r ,cmd.exe /c ,cmd.exe /k ,cmd.exe /r ,powershell,mshta,wscript,cscript,certutil,bitsadmin,bash.exe,bash ,scrcons,wmic ,wmic.exe,forfiles,scriptrunner,hh.exe,hh " select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Nasreddine Bencherchali (Nextron Systems)
