Sigma detection rules, expert-reviewed

Windows Service Install (Event ID 7045) for srservice, ipvpn, hkmsvc

Alerts on Windows service creation events (7045) for srservice, ipvpn, and hkmsvc service names.

Windows Service Creation: ServiceName javamtsup (Event ID 4697)

Flags Windows Security Event 4697 when a service named "javamtsup" is installed, indicating potential persistence.

Linux Log File Alerts for Suspicious Messages

Generates alerts when Linux log text contains suspicious keywords indicating possible network, service, or logging disruption.

PowerShell downgrade indicators via EngineVersion=2. and HostVersion !=2. (Windows)

Detects PowerShell version mismatches that may indicate a downgrade attempt using EngineVersion vs HostVersion telemetry.

Windows Registry UAC Bypass via Event Viewer Command Key (mscfile shell open command)

Alerts on registry changes to the mscfile shell open command key consistent with an Event Viewer UAC bypass technique.

Windows Event Viewer (eventvwr.exe) Spawns Suspicious Child Processes

Alerts when eventvwr.exe spawns unusual child processes in Windows process creation logs.

Windows Network Connections to Uncommon Ports (8080, 8888)

Flags Windows-initiated connections to ports 8080/8888 excluding private/local IPs and Program Files binaries.

Windows Network Connections to Known Malware Callback Ports (Suspicious Destination Ports)

Flags Windows processes initiating outbound connections to malware callback ports, excluding local/private IP ranges.

Windows network connection from process running in suspicious or uncommon file paths

Alerts on Windows network connections initiated by processes executing from suspicious or uncommon directories.

Windows UAC Bypass Indicator via sdclt Registry Key Manipulation

Alerts on registry set activity consistent with sdclt-related UAC bypass key manipulation.

Windows Security: Local Administrators Group Membership Change (Event 4732)

Flags Windows Event 4732 where a user is added to the local Administrators group.

Linux Log Shellshock Expression Pattern Matching

Identifies Shellshock-style function-body expressions in Linux log data via keyword string matches.

Windows PowerShell Web Access User-Agent Containing "WindowsPowerShell/" (Proxy Logs)

Alerts when proxy traffic shows a User-Agent containing "WindowsPowerShell/", consistent with PowerShell web access.

Proxy: Block Suspicious Executable Downloads from Non-Trusted Top-Level Domains

Finds proxy traffic requesting executable or script/doc payloads from hosts with suspicious TLDs not in the whitelist.

Windows Network Connections Initiated by PowerShell (powershell.exe or pwsh.exe)

Flags outbound network connections initiated by PowerShell on Windows, excluding common local and private IP ranges.