SigmaHQ Detections
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Detects the creation or modification of scheduled tasks using `schtasks.exe` with suspicious schedule types such as 'ONLOGON', 'ONSTART', 'ONCE', or 'ONIDLE'. This rule specifically filters out common legitimate system accounts like 'NT AUTHORITY\SYSTEM' and 'SYSTEM' and the 'HIGHEST' privilege setting to reduce false positives.
Detects the creation of a scheduled task using 'schtasks.exe' that is configured to execute a PowerShell command. The PowerShell command specifically attempts to retrieve a base64 encoded payload from the Windows Registry (HKCU or HKLM hive) and execute it. This technique is often used by adversaries for persistence and to evade detection by obfuscating the malicious payload.
Detects the creation or modification of scheduled tasks using 'schtasks.exe' that are configured to run with high privileges (NT AUTHORITY\SYSTEM, SYSTEM, or HIGHEST) and utilize suspicious schedule types such as ONLOGON, ONSTART, ONCE, or ONIDLE. This combination is often indicative of persistence or privilege escalation attempts by adversaries.
Detects the Windows Installer service (msiexec.exe) attempting to install MSI packages with SYSTEM privileges, which can be indicative of privilege escalation through the 'AlwaysInstallElevated' policy.
This rule detects the execution of 'VBoxDrvInst.exe' with specific parameters ('driver' and 'executeinf') that allow it to process INF files. This capability can be abused to create registry values and install drivers, potentially leading to persistence mechanisms such as modifying Run or RunOnce registry keys.
Detects the execution of the Xwizard tool from a non-default directory. When executed from a non-default directory, this utility can be abused to side-load a custom version of "xwizards.dll", which can be used for privilege escalation, persistence, or defense evasion.
This rule detects attempts to clear the connection history for Microsoft Terminal Server Client (MSTSC) by deleting specific registry keys or values. This activity can be performed by an attacker to remove forensic evidence of their remote access to a system.
This rule detects the creation or modification of the 'MiniNt' registry key under 'HKLM\SYSTEM\CurrentControlSet\Control\'. The presence of this key, particularly after a system reboot, can prevent the Windows Event Log service from writing events, effectively disabling security event logging. This is a known technique used by adversaries for defense evasion.
This rule detects modifications to the 'Run Once' registry key, specifically targeting the 'StubPath' value within 'Microsoft\Active Setup\Installed Components'. This registry key is often used by legitimate applications for one-time execution tasks, but adversaries can abuse it to establish persistence or execute malicious payloads. The rule includes filters to exclude common legitimate modifications made by Google Chrome and Microsoft Edge installers, which frequently use this mechanism.
Detects the creation or modification of Windows Run keys by executables located in suspicious directories such as user Downloads, temporary Outlook attachments, or Internet Explorer temporary files. This behavior is often indicative of persistence mechanisms used by malware or adversaries.
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