SigmaHQ Detections
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6,800 detections
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Detects the installation of a new Windows service where the service executable's image path contains suspicious locations such as 'AppData' directories or remote IP addresses like '127.0.0.1' or 'localhost'. This can indicate an attempt at persistence or privilege escalation by adversaries installing malicious services in non-standard locations.
Detects actions taken by Windows Defender malware detection engines, indicating that malware or potentially unwanted software has been found, suspicious behavior has been detected, or an action has been performed to protect the system.
Detects the download of a file with a potentially suspicious extension from a .zip top-level domain. This rule specifically looks for the creation of alternate data streams (ADS) containing a 'Zone.Identifier' indicating a download from a '.zip' TLD, combined with suspicious file extensions commonly used for malicious payloads.
Detects the deletion of Exchange PowerShell cmdlet history logs, which may indicate an attempt by an adversary to destroy forensic evidence and evade detection. This action can hinder incident response and forensic analysis.
Detects the creation of suspicious web shell files (ASPX, ASP, ASHX) by the IIS worker process (w3wp.exe) in directories commonly associated with Microsoft Exchange or IIS web roots. This activity is indicative of potential exploitation of Exchange vulnerabilities, such as those used in the ProxyShell or ProxyNotShell attacks, to establish persistence via web shells.
Detects WerFault creating a dump file with a name that indicates the dump file could be an LSASS process memory dump, which contains user credentials. This technique is often used by adversaries to extract credentials for lateral movement or privilege escalation.
Detects the creation of suspicious executable or script files within the OneNote temporary directory, indicating potential malware delivery and execution via malicious OneNote attachments. This behavior has been observed in recent malware campaigns leveraging OneNote files.
This rule detects when PowerShell (powershell.exe or pwsh.exe) creates a new PowerShell script file (.ps1). While this behavior can be benign in many cases, it can also indicate a dropper script attempting to establish persistence on a system. The rule filters out common legitimate scenarios such as PowerShell's internal script policy tests and temporary files created in user AppData\Local\Temp or C:\Windows\Temp directories.
Detects the creation of new PowerShell module files (.ps or .dll) in the first folder of the module directory structure, specifically within '\WindowsPowerShell\Modules\*\'. This pattern is considered suspicious because legitimate PowerShell modules commonly include a version folder within their directory structure, making direct creation in the module root less common for benign modules.
This rule detects the creation of executable files (.exe) or dynamic link libraries (.dll) within the default Group Policy Object (GPO) storage folder. Adversaries may place malicious files in this location to leverage Group Policy for persistence, privilege escalation, or to distribute malware across a domain. The specific folder path targeted is '\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\' which corresponds to the Default Domain Policy GPO.
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