Sigma detection rules, expert-reviewed

Windows: File Download via CertOC.exe Using -GetCACAPS HTTP

Flags CertOC.exe launched with -GetCACAPS and an http URL, indicating a remote file retrieval attempt.

Windows Remote Thread Creation via Ttdinject.exe Proxy

Alerts on Windows create-remote-thread events initiated by Ttdinject.exe used as a proxy.

Windows Process Creation: reg.exe Adds Winlogon SpecialAccounts Userlist Value 0

Flags reg.exe command lines that add SpecialAccounts Userlist with /d 0 to hide accounts from the logon screen.

Windows Service Creation for KrbRelayUp (KrbSCM)

Flags creation of the KrbSCM Windows service, a known KrbRelayUp installation artifact.

Windows PowerShell Execution of Obfuscated One-Liner for In-Memory Module Download

Alerts on Windows PowerShell one-liners containing an obfuscated in-memory download/execute pattern from an HTTP URL.

Windows: WerFault.exe/wer.dll File Creation in Uncommon Locations

Alerts on newly created WerFault.exe or wer.dll in non-standard locations, suggesting potential DLL hijacking activity.

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 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.