SigmaHQ Detections
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Detects the execution of a Sysinternals Tool via the creation of the "EulaAccepted" registry key. Many Sysinternals tools create this key upon first execution to signify acceptance of the End User License Agreement (EULA). This can be an indicator of Sysinternals tools being used on a system, which are often leveraged by adversaries for various post-exploitation activities.
Detects the creation of the "accepteula" registry key by Sysinternals tools that have been renamed. This behavior is suspicious because legitimate Sysinternals tools typically create this key with their original executable names. Adversaries often rename tools to evade detection, and this rule specifically looks for instances where the EULA acceptance key is created by an executable whose name does not match the expected Sysinternals tool name.
This rule detects the creation of a local hidden user account by monitoring Windows Registry events. Specifically, it looks for modifications within the 'SAM\SAM\Domains\Account\Users\Names\' registry path where the target object (the account name) ends with a '$' character, indicating a hidden account. The detection is further refined by ensuring the event is generated by 'lsass.exe', which is responsible for managing user accounts and authentication.
Detects the creation or modification of a specific registry key path associated with the 'Pandemic' Windows implant. The key path observed is '\SYSTEM\CurrentControlSet\services\null\Instance'. This rule helps identify the presence or activity of the Pandemic malware.
This rule detects modifications to the Windows Registry key associated with "TrustRecords" for Microsoft Office applications. These trust records are created when a user enables macros in a document, indicating that the document's source is trusted. Adversaries often leverage malicious macros in documents as an initial access vector. Monitoring changes to this registry path can help identify when macros are being enabled, potentially by a user interacting with a malicious document.
Detects when the 'windir' environment variable is modified from its default value. This modification is often a precursor to a User Account Control (UAC) bypass technique leveraging the 'SilentCleanup' scheduled task, which is an auto-elevated task that can execute with administrator privileges without prompting the user.
This rule detects modifications to the Internet Explorer ZoneMap Domains registry key, which can be used to add domains to specific security zones (e.g., Trusted Sites). Adversaries might modify these settings to lower security restrictions for malicious websites or to bypass security prompts.
Detects when the Windows Firewall is disabled by setting the 'EnableFirewall' registry value to 0 (DWORD 0x00000000) for either the StandardProfile or DomainProfile. This action can be performed by adversaries to bypass network controls and facilitate malicious activity.
Detects applications being added to the "allowed applications" list of Exploit Guard's Controlled Folder Access feature, specifically when these applications are located in suspicious paths. This action can be used by adversaries to bypass Controlled Folder Access protections and execute malicious code.
Detects when an attacker adds a new "DLLPathOverride" value to the "Natural Language" key in the Windows Registry to achieve persistence. This persistence mechanism leverages the "SearchIndexer.exe" process to invoke the malicious DLL.
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