Sigma detection rules, expert-reviewed

Windows Registry Tampering Targeting Sophos AV Tamper Protection Enabled Flags

Flags Windows registry changes that disable Sophos AV tamper protection by clearing specific enabled DWORD values.

Windows Process Creation: reg.exe Adds or Copies SafeBoot Registry Keys

Flags reg.exe with add/copy used against SafeBoot registry keys in Windows process creation logs.

Windows Process Execution of Fast Reverse Proxy (FRP) frpc.exe or frps.exe

Alerts on Windows execution of FRP components (frpc.exe/frps.exe) with FRP indicators via command line or known hashes.

Windows: Detect Ldifde.exe LDAP import (-i -f) usage

Flags Ldifde.exe being run with LDAP import parameters (-i and -f) that may trigger remote content retrieval.

Windows certutil.exe Initiates Network Connections to Common Service Ports

Alerts when certutil.exe initiates outbound network connections to ports 80, 135, 443, or 445 on Windows.

Windows Service Control Binary Usage: Stop/Pause/Disable/Delete on Protected Services

Alerts on net/sc/wmic/PowerShell commands that stop, pause, delete, or disable Windows services, especially security/backup services.

Windows Process Creation: Suspicious ShellExec_RunDLL Command-Line Usage

Detects Windows command lines containing ShellExec_RunDLL along with other suspicious execution indicators.

Windows net.exe Commands Manipulating Built-in Default Accounts (administrator/guest)

Flags net.exe/net1.exe process creation when command lines reference built-in Administrator/guest/default accounts with suspicious active/disable context.

Windows Suspicious cmd.exe Launch After net use Mounting WebDAV Share

Flags cmd.exe command lines that mount an Internet WebDAV share with net use and immediately execute content from DavWWWRoot.

Windows Suspicious Process Execution Using GUID-Like Folder Names in %TEMP% or AppData

Hunts Windows processes whose command lines reference GUID-named folders in user AppData/Temp locations.

Windows schtasks.exe scheduled task creation or modification with high privileges on suspicious schedule types

Flags schtasks.exe commands that create/modify tasks to run on ONLOGON/ONSTART/ONCE/ONIDLE with SYSTEM or HIGHEST privileges.

Windows Process Creation: Wscript.Shell.Run keyword sequence in CommandLine

Alerts on Windows command lines containing Wscript.Shell.Run keyword sequence, suggesting script-driven shell execution.

Windows Process Creation: DefenderCheck.exe Execution (PUA/Signature Evasion)

Alerts on execution of DefenderCheck.exe/description to identify potential AV signature probing and evasion preparation.

Windows Network Connection from Cmstp.EXE (Outbound)

Alerts on outbound network connections initiated by cmstp.exe, which is uncommon and may indicate process misuse.

Windows: cmstp.exe Loading DLL/OCX from Suspicious Paths

Alerts when cmstp.exe loads DLL/OCX from suspicious directories on Windows.