Sigma detection rules, expert-reviewed

Windows Security: AD object replication attempted by non-machine account (Event ID 4662)

Alerts on AD replication-related object access events where the requester is not a machine account.

Windows regsvr32 Executes DLL with Uncommon Extension in Command Line

Alerts when regsvr32.exe is launched with a DLL extension pattern that is not in the common list.

Windows regsvr32 Usage of /i Without /n Flag

Alerts on regsvr32.exe invocations using /i: without the usually paired /n flag.

Windows: Explorer factory invocation causing process tree break

Alerts on process creation command lines showing explorer.exe factory and /root usage consistent with an explorer-based process tree break.

Windows Process Creation: Executable Extension Masquerading with .exe After Decoy Extension

Alerts on Windows processes whose paths/command lines use misleading double extensions ending in .exe to cloak executable execution.

Windows Security Log LSASS Access by Non-Computer Account Process

Alerts on suspicious LSASS access attempts (4663/4656) targeting lsass.exe by non-system processes using flagged access masks.

Windows Security Event 4662 Detects DPAPI Domain Backup Key Extraction from Domain Controllers

Detects read access to LSA secret DPAPI domain backup key objects in Windows Event ID 4662.

Windows: Suspicious userinit.exe Child Process Creation

Alerts when userinit.exe spawns an atypical child process, excluding known benign explorer and netlogon command-line patterns.

Windows Process Creation: Flag Renamed Execution of Common LOLBins Based on OriginalFileName

Alerts when a renamed process executes and Sysmon OriginalFileName matches common Windows LOLBins, suggesting defense-evasion rename behavior.

Windows Process Creation: Suspicious Renamed Binary Masquerading as Common Tools

Flags Windows executions where Sysmon OriginalFileName matches common tools but the process Image name ends differently.

Windows Pass-the-Hash Activity via Security Event 4624 (LogonType 3 or 9)

Flags Windows 4624 successful logons consistent with Pass-the-Hash activity using NtLmSsp or seclogo.

Webserver URL Enumeration for Exposed .git Paths via GET Keyword

Alerts when web requests include .git/ in the URL, suggesting source code enumeration against version control paths.

Windows Process Creation: Renamed jusched.exe Execution via Java Scheduler Names

Alerts when Java Update Scheduler descriptions are used to execute a process ending with \jusched.exe on Windows.

Windows Security 4625 Logon Failures to TargetUserName AAAAAAA Indicative of RDP Scan PoC

Alerts on Windows failed logon (4625) events matching a BlueKeep scanner PoC TargetUserName value.

Windows System Log RDP TermDD Errors Matching EventIDs 50 or 56

Flags suspicious TermDD RDP error events (Event IDs 50/56) on Windows that may indicate CVE-2019-0708 activity.