Sigma detection rules, expert-reviewed

Windows Security Event 5379: Opened Password-Protected ZIP from Outlook Attachment

Flags Windows events where a password-protected ZIP is opened from Outlook Temporary Internet Files.

Windows Security: Password-Protected ZIP Opened with Suspicious Filename Indicators

Alerts when Windows opens password-protected ZIP contents with filenames commonly tied to invoices, orders, payments, and deliveries.

Windows Security Event 5379: Password-Protected ZIP Opened

Flags Windows EventID 5379 indicating a password-protected ZIP archive was opened.

Windows: ie4uinit.exe Used from Non-Standard Current Directory

Flags ie4uinit.exe runs whose CurrentDirectory is outside expected system paths, indicating potential LOLBIN misuse.

Windows Process Creation: Ilasm.EXE Used to Compile IL to EXE/DLL

Alerts when Ilasm.EXE is run with /exe or /dll to compile IL into a Windows binary.

Windows Process Creation: Cobalt Strike module/command strings entered in cmd.exe

Alerts when cmd.exe command lines include Cobalt Strike module/command strings.

Windows Process Command Line: Accidental Cobalt Strike Commands in cmd.exe

Flags cmd.exe executions whose command lines include known Cobalt Strike command terms.

Windows Raspberry Robin Execution via cmd.exe Parent and External-File Payload

Flags cmd.exe with /r from external media launching msiexec.exe /q that includes an HTTP/HTTPS payload URL.

Windows: Raspberry Robin Command Execution via fodhelper.exe and rundll32/regsvr32

Flags Windows process-spawn chains where fodhelper.exe runs rundll32/regsvr32 with Raspberry Robin-style command-line patterns.

Windows Process Creation: Suspicious Child Processes Spawned by regsvr32.exe

Alerts when regsvr32.exe spawns suspicious child processes like PowerShell, mshta, or scripting utilities.

Windows: Registry Set by Rundll32 for Screen Saver Execution via SCRNSAVE.EXE

Flags Windows registry sets where Rundll32 points SCRNSAVE.EXE to a .scr file.

Windows Rundll32 Calls DavSetCookie for NTLM Coercion via Spoolss/Srvsvc

Detects rundll32.exe launching davclnt.dll DavSetCookie with HTTP and spoolss/srvsvc pipe parameters associated with NTLM coercion.

Linux: Detects Nimbuspwn-related exploit strings targeting CVE-2022-29799/CVE-2022-27800

Detects Linux keyword patterns suggesting Nimbuspwn-style traversal attempts via networkd-dispatcher error handling.

Windows Registry: Service configured with image path in suspicious public/temp folders

Detects Windows service ImagePath pointing to Users\Public, Perflogs, ADMIN$, or Temp based on registry_set events.

Windows: PrintBrm.exe ZIP extraction or creation via command-line parameters

Flags PrintBrm.exe executions that include '-f' and '.zip', consistent with ZIP creation or extraction behavior.