SigmaHQ Detections
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This rule detects a specific UAC bypass technique (UACMe method 39) that leverages .NET Code Profiler and DLL hijacking against mmc.exe. It specifically looks for the creation of a DLL named 'pe386.dll' within a user's temporary AppData directory, which is characteristic of this bypass method.
Detects the creation of Virtual Hard Disk (.vhd or .vhdx) files by common browser processes. This activity can be indicative of malware delivery, as adversaries may use VHD files to encapsulate payloads and bypass security controls, particularly Mark-of-the-Web (MOTW) protections.
Detects signs of the WMI script host process "scrcons.exe" loading scripting DLLs which could indicate WMI ActiveScriptEventConsumers activity. This is a common technique for persistence and privilege escalation.
Adversaries may steal data by exfiltrating it over an un-encrypted network protocol other than that of the existing command and control channel. The data may also be sent to an alternate network location from the main command and control server. This rule detects suspicious outbound SMTP connections by looking for connections to common SMTP ports (25, 587, 465, 2525) from processes that are not common mail client applications like Thunderbird or Outlook, or Microsoft Exchange Server processes.
Detects the creation of the default named pipe for PsExec (PSEXESVC) when the PsExec executable is run from suspicious locations such as temporary directories, public user folders, or common download/desktop locations. This activity can indicate the use of PsExec by an attacker.
This rule detects PowerShell commands that use `Get-ChildItem` with `-Recurse` and `-Include` parameters to search for common document and archive file extensions. This behavior is indicative of an adversary attempting to automatically collect sensitive data from a system or network.
This rule detects the use of '.CopyFromScreen' within PowerShell script block text. This API call is commonly used by adversaries to capture screenshots of the desktop, which is a technique for gathering information during an operation. The detection relies on PowerShell Script Block Logging being enabled to capture the script content.
This rule detects the installation of a root certificate on a Windows system via PowerShell. It specifically looks for PowerShell script block text containing commands like 'Move-Item' or 'Import-Certificate' targeting the 'Cert:\LocalMachine\Root' path. Adversaries may install root certificates to bypass security warnings when connecting to their controlled web servers, facilitating man-in-the-middle attacks or credential harvesting.
Detects the execution of an MSI file using PowerShell and the WMI Win32_Product class. This method can be used for defense evasion by leveraging a trusted system utility (PowerShell) and a legitimate WMI class to install software, potentially bypassing traditional application whitelisting or execution policies.
Detects suspicious execution of AgentExecutor.exe, a Microsoft Intune component, when it is used to launch PowerShell scripts with potentially bypassed execution policies or to execute a 'powershell.exe' binary from a specified path. This behavior can be indicative of a Living Off The Land Binary (LOLBIN) abuse.
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