Sigma detection rules, expert-reviewed

Windows Network Share File Transfers Targeting Credential and Memory Dump Paths

Alerts on network share access to credential-related files using Windows Security Event 5145.

Rundll32.exe DLL Export Calls by Ordinal (Windows Process Creation)

Detects rundll32.exe commands that specify DLL exports by ordinal using “.dll #” syntax.

Windows Network Tool Use for Possible Packet Sniffing (tshark/windump)

Alerts on Windows executions of tshark or windump that indicate potential passive network traffic capture.

Windows Local Account Discovery via System Utilities Process Execution

Flags Windows processes that match utilities used to enumerate local user and account information.

Windows: Detect sc.exe Service Config binPath Changes to Suspicious Commands/Paths

Alerts when sc.exe updates a service binPath to point at suspicious commands or commonly abused directories.

Windows reg.exe Registry Query Reconnaissance

Alerts on reg.exe process executions performing registry queries against high-value configuration and service keys.

Windows Rar.exe Files Added to Archive Activity

Alerts when Windows rar.exe is used to add files to an archive using the " a " command-line pattern.

Windows: net.exe used to start a service with the start flag

Identifies Windows processes using net.exe/net1.exe with ' start ' to start services.

Windows Msxsl.exe Execution

Flags execution of the Windows MSXSL utility (msxsl.exe), which can be abused to process attacker-controlled XSL inputs.

Windows Process: File Association Changes via assoc Command

Alerts on cmd.exe launches running the assoc command to modify Windows default file associations.

PowerShell ScriptBlock Winlogon Registry Modification via CurrentVersion\Winlogon

Detects PowerShell script blocks that modify Winlogon helper registry keys via Set-ItemProperty or New-Item on Windows.

Suspicious Crypto Miner User Agents in Proxy Logs

Flags proxy requests with User-Agent prefixes tied to XMRig or CCMiner crypto miners.

Linux System Owner or User Discovery via Common Utility Execution

Flags execution of Linux user/system identification utilities such as whoami and id.

Linux: Detect execution of tcpdump or tshark with interface (-i) capture option

Alerts on tcpdump or tshark executions on Linux where an interface flag is present, consistent with network sniffing.

Linux Masquerading via crond Path Using cp Launching /bin/sh

Alerts on Linux execve where cp runs through /bin/sh and the argument ends with /crond, indicating potential masquerading.