Sigma detection rules, expert-reviewed

Windows Process Command Line Matches Perfect Homoglyph Unicode Characters

Alerts when a Windows process command line includes Unicode homoglyphs that look like ASCII letters.

Windows ImageLoad of SolidPDFCreator.dll from Unexpected Paths

Alerts when SolidPDFCreator.dll is loaded from a non-standard process or path, consistent with potential DLL sideloading.

Okta FastPass blocks phishing authentication attempts via MFA

Alerts on Okta FastPass MFA failures where the declined reason indicates a known phishing attempt.

Windows Wget.exe Downloads From File-Sharing Domains Matching Suspicious Output Flags

Flags wget.exe executions on Windows that download via HTTP from known file-sharing domains and write specific file extensions to disk.

Windows curl.exe Downloads from File-Sharing Domains with Suspicious Output Extensions

Alerts on curl.exe downloading files over HTTP from file-sharing/content hosting domains, based on process command-line and executable context.

PowerShell Script Reading Files and Resolving DNS Host Entries

Identifies PowerShell scripts that read files, resolve DNS host entries, and output results to disk.

Windows DLL Sideloading: libcurl.dll Loaded by gup.exe from Uncommon Location

Alerts when gup.exe loads libcurl.dll from a path that doesn’t match the excluded Notepad++ GUP.exe location.

Windows: File creation of a Procmon-named .sys driver by non-procmon processes

Alerts when a procmon-named .sys driver is created by a process other than procmon.

Windows: Process Explorer Driver (.sys) Creation by Non-Process Explorer Process

Alerts on creation of PROCEXP-named .sys drivers by processes other than Process Explorer.

Windows Suspicious File Creation in C:\PerfLogs with Executable/Script Extensions

Alerts on creation of potentially malicious file types in C:\PerfLogs\ on Windows.

Windows: File Creation of NTDS.DIT (Active Directory Database)

Flags creation of an ntds.dit file on Windows, an Active Directory database artifact often associated with credential access.

Windows Process: sqlcmd.exe Querying Veeam Backup Databases

Flags sqlcmd.exe command lines querying Veeam backup database objects associated with repository and credential data.

Windows: Suspicious child processes spawned from Veeam SQL Server service

Alerts on suspicious cmd/PowerShell/LOLBin and recon utilities spawned by the Veeam SQL service (sqlservr.exe with VEEAMSQL).

Windows PowerShell Credential Dumping Script Targeting Veeam Backup ProtectedStorage

Alerts on PowerShell scripts that reference Veeam protected storage and credential extraction indicators, enabling stored credential dumping on Windows.

Proxy User-Agent starts with Base64-like prefixes associated with encoded client strings

Identifies proxy requests with User-Agent values starting with known Base64-encoded prefixes.