Sigma detection rules, expert-reviewed

Linux Base64 Utility Decoding with -d/--decode in Process Creation

Identifies Linux base64 decoding activity using base64 with the -d/--decode flag.

Windows RunOnce Execution via runonce.exe With AlternateShellStartup and /r

Alerts on runonce.exe executing with /AlternateShellStartup and /r, consistent with configured RunOnce persistence behavior.

Windows Process Execution and DLL Injection via Tracker.exe

Alerts on Tracker.exe executions with /d and /c command-line switches, excluding matching MSBuild child process patterns.

Windows: msdeploy.exe Execution with sync and RunCommand Parameters

Flags msdeploy.exe executions that include sync verb plus RunCommand source and destination parameters.

Windows PowerShell Process Creation: COMPRESS OBFUSCATION with ASCII Encoding and DeflateStream

Flags PowerShell process creation command lines that use ASCII encoding plus compression/stream-reading patterns associated with obfuscation.

Windows: Dotnet.exe executes arbitrary DLL or csproj files

Alerts when dotnet.exe runs with .csproj or .dll arguments that may indicate loading or execution of untrusted .NET code.

PowerShell ScriptBlock Logging: Obfuscated RUNDLL Launcher using rundll32.exe and shell32.dll

Identifies PowerShell script content invoking rundll32.exe/shell32.dll via shellexec_rundll and referencing PowerShell.

Detect PowerShell COMPRESS OBFUSCATION using ASCII text encoding and stream/compression APIs

Flags PowerShell script blocks that combine ASCII encoding with Deflate/stream handling indicative of obfuscated payload compression.

PowerShell module activity launching rundll32 via shell32.dll obfuscation content

Alerts when PowerShell module payloads reference a shell32/rundll32 launcher pattern that includes PowerShell.

PowerShell Module Payload Obfuscation Using COMPRESS OBFUSCATION

Identifies PowerShell module payloads containing ASCII encoding and compression/stream obfuscation strings.

Windows System: Detect rundll32 Service Control Manager launches PowerShell via obfuscated parameters

Flags service creation where ImagePath uses rundll32/shell32 (shellexec_rundll) to invoke PowerShell.

Windows System: Service Control Manager PowerShell Obfuscation Using COMPRESS OBFUSCATION

Flags new Windows services whose ImagePath includes obfuscated PowerShell markers using COMPRESS/stream decompression.

Windows Security 4697: Obfuscated PowerShell via rundll32 shell32 shellexec_rundll

Alert on Security EID 4697 where service installation references rundll32/shell32.dll to launch PowerShell.

Windows Security 4697 PowerShell obfuscated content using COMPRESS OBFUSCATION components

Alerts on service creation events where the ServiceFileName includes PowerShell obfuscation patterns tied to compression stream and ASCII encoding.

LockerGoga Ransomware Indicators in Windows Process Command Line

Flags Windows processes with a specific LockerGoga-style command-line argument pattern.