Sigma detection rules, expert-reviewed

Windows Process Creation: Detect IMEWDBLD.EXE Downloading Files via HTTP/HTTPS

Alerts when IMEWDBLD.exe runs with an HTTP/HTTPS URL, indicating arbitrary file downloads.

Windows: Detect SysAid user.exe Loader Execution by Filename and SHA256 Hash

Flags execution of a specific SysAid-hosted Windows binary when the process image path and SHA256 match.

Windows Process Execution for PowerShell Cobalt Strike Download via Hidden IEX

Flags PowerShell command lines that use IEX and hidden downloadstring to fetch a Cobalt Strike payload.

Windows PowerShell script launcher matching SysAidServer Tomcat paths

Flags PowerShell script block text tied to SysAid Tomcat webapp paths and user.exe staging/launch actions.

PowerShell Script Evidence Eraser Searching for cleanLL and usersfiles.war

Identifies PowerShell script blocks containing evidence-cleanup indicators and a repeating while(1) loop.

Windows PowerShell Script File Creation: SysAidServer Webapp User/User.exe Indicators

Detects creation of specific SysAidServer Tomcat webapp files indicative of PowerShell script staging on Windows.

F5 BIG-IP Webserver RCE exploitation attempts via POST to /mgmt/tm/util/bash

Alerts on POST requests to /mgmt/tm/util/bash containing tmui Control/form parameters consistent with CVE-2023-46747 exploitation attempts.

F5 BIG-IP Proxy: Detect POST requests exploiting CVE-2023-46747 via /mgmt/tm/util/bash

Alerts on POST requests containing /mgmt/tm/util/bash plus TMUI control/user-create form parameters indicative of CVE-2023-46747 exploitation.

Windows Registry: Disabling Antivirus Filter Driver on Dev Drive via FltmgrDevDriveAllowAntivirusFilter

Detects registry changes disabling antivirus minifilter inspection on a Dev Drive by setting the allow setting to 0x0.

Windows image load and execution of unsigned Thor scanner (thor.exe/thor64.exe)

Alerts on thor.exe/thor64.exe image loads on Windows where the Authenticode signature is missing or not from Nextron Systems.

Windows Process Creation: rundll32 Spawns Pikabot-Like Hollowing Binaries

Alerts when rundll32.exe spawns specific Windows binaries in patterns consistent with potential process hollowing.

Windows Process Creation Signals for Pikabot System Discovery

Flags process-launch discovery commands (ipconfig/netstat/whoami) under rundll32 and Search host parent processes on Windows.

Windows file creation of code_tunnel.json outside Code/VsCode executables

Alerts on creation of code_tunnel.json on Windows when it isn’t created by typical VS Code binaries.

Windows File Creation: inetmgr.exe in \Windows\ADFS\bg\ Path

Alerts on creation of \Windows\ADFS\bg\inetmgr.exe in Windows file events.

Windows Registry Events: Scheduled Task Creation via TaskCache Tree Key

Flags registry activity creating TaskCache Tree entries tied to TeamCity settings UI during exploitation.