SigmaHQ Detections
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This rule detects the execution of a renamed 'dctask64.exe' binary. 'dctask64.exe' is a legitimate, signed executable by ZOHO Corporation, part of ManageEngine Endpoint Central. Adversaries can abuse this binary for malicious purposes such as DLL injection, arbitrary command execution, and process execution. The detection logic specifically looks for process creation events where the image hash matches known hashes of 'dctask64.exe' but the filename is not 'dctask64.exe', indicating a potential masquerading attempt.
Detects manual execution of the "Microsoft Compatibility Appraiser" task via schtasks. This activity is often used to trigger persistence stored in the "\AppCompatFlags\TelemetryController" registry key.
Detects the creation or modification of registry keys associated with Windows Assistive Technology applications, specifically focusing on changes to the 'ATs' and 'Configuration' keys under 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility'. This activity can be indicative of persistence or privilege escalation attempts by adversaries abusing accessibility features like 'atbroker.exe'. The rule includes filters to reduce false positives from legitimate 'atbroker.exe' activity or MSI installers.
Detects modifications to specific Windows Registry keys under the `Wow6432Node\Microsoft\Windows NT\CurrentVersion` path, which are commonly used for autostart extensibility points (ASEPs). Specifically, it looks for changes to `Appinit_Dlls` and `Image File Execution Options` which can be abused for persistence or privilege escalation.
This rule detects modifications to the Windows Registry key `HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\WDigest\UseLogonCredential` where its value is set to `0x00000001`. This modification enables the WDigest protocol to store clear-text credentials in memory, making them vulnerable to credential dumping attacks. Adversaries often enable this setting to facilitate the extraction of user credentials from the Local Security Authority Subsystem Service (LSASS) process.
This rule detects potential DLL sideloading attempts using the 'coregen.exe' (Microsoft CoreCLR Native Image Generator) binary. It specifically looks for instances where 'coregen.exe' loads DLLs from locations other than the legitimate Microsoft Silverlight or Windows system directories (System32, SysWOW64). This behavior can indicate an adversary attempting to execute malicious code by tricking a legitimate, signed Microsoft binary into loading their arbitrary DLL.
Detects potential DLL side loading of "KeyScramblerIE.dll" by "KeyScrambler.exe".
Various threat actors and malware have been found side loading a masqueraded "KeyScramblerIE.dll" through "KeyScrambler.exe".
Various threat actors and malware have been found side loading a masqueraded "KeyScramblerIE.dll" through "KeyScrambler.exe".
Detects the loading of 'wbemcons.dll' by 'WmiPrvSE.exe', which is indicative of a WMI command line event consumer being used for persistence. This technique is often leveraged by adversaries to maintain access and execute code when specific WMI events occur.
This rule detects PowerShell scripts that attempt to retrieve Access Control Lists (ACLs) for service-related registry keys under HKLM\SYSTEM\CurrentControlSet\Services. This activity could indicate an adversary performing reconnaissance for service registry permissions weaknesses, which can be exploited for privilege escalation or persistence. Adversaries may execute their own malicious payloads by hijacking the Registry entries used by services if permissions are misconfigured.
Detects the execution of "dctask64.exe", a signed binary by ZOHO Corporation part of ManageEngine Endpoint Central. This binary can be abused for DLL injection, arbitrary command and process execution.
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