Hide Schedule Task Via Index Value Tamper
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About the rule
Rule Type
Standard
Rule Description
Detects when the "index" value of a scheduled task is modified from the registry Which effectively hides it from any tooling such as "schtasks /query" (Read the referenced link for more information about the effects of this technique)
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Registry value modified" AND ((OBJECTNAME contains "\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree" AND OBJECTNAME contains "Index") OR (OBJECTNAME endswith "\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree" AND isExist(OBJECTVALUENAME))) AND (INFORMATION = "DWORD (0x00000000)" OR (CHANGES = 0 AND NEWTYPE = "REG_DWORD")) select Action1.HOSTNAME,Action1.MESSAGE,Action1.OBJECTNAME,Action1.PROCESSNAME,Action1.PREVVAL,Action1.CHANGES
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Nasreddine Bencherchali (Nextron Systems)
