SigmaHQ Detections
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Detects when highly privileged delegated permissions are granted on behalf of all users in Azure Active Directory. This can indicate an attempt to gain broad access to resources by an application.
Detects the usage of the 'base64' utility with the decode flag ('-d' or '--decode') on Linux systems. This activity can indicate an adversary attempting to deobfuscate or decode base64-encoded text, which is a common technique for hiding malicious payloads or commands.
This rule detects the creation of a new Windows service where the ImagePath contains 'rundll32.exe', 'shell32.dll', 'shellexec_rundll', and 'powershell'. This specific combination is indicative of an attempt to execute obfuscated PowerShell code via rundll32.exe, a common technique for defense evasion and execution.
This rule detects the creation of files with a '.dll' extension that have names matching known Windows system DLLs (e.g., 'secur32.dll', 'tdh.dll') but are created in unusual or non-standard system directories. The rule specifically excludes common legitimate system directories like 'System32' and 'SysWOW64' to reduce false positives. This behavior can indicate an attempt at DLL sideloading or other defense evasion techniques where an attacker places a malicious DLL with a legitimate system DLL name in a location that a legitimate application might load it from.
Detects the creation of a file named "ErrorHandler.cmd" in the "C:\WINDOWS\Setup\Scripts\" directory. This file can be used as a persistence mechanism because its content is executed whenever certain tools under "C:\WINDOWS\System32\oobe\" (e.g., Setup.exe) fail to run.
Detects the creation of recent file shortcuts (.lnk) that point to disk image files (.iso, .img, .vhd, .vhdx). This activity is often observed in phishing attacks where adversaries use these file types to deliver malware. The rule specifically looks for these shortcuts within the 'Recent' folder of a user's profile, indicating that the user has recently interacted with such a file.
Detects the creation of Usage Log files by the CLR (clr.dll) for specific system binaries. These files are named after the executing process once the assembly is finished executing for the first time in the (user) session context. This activity can be indicative of defense evasion techniques where adversaries use trusted binaries to proxy execution of malicious code, and the CLR usage logs can reveal this activity.
Detects the creation of files with the '.pub' extension (Microsoft Publisher documents) in suspicious or uncommon locations such as temporary directories or public user folders. This activity could indicate an attacker abusing Publisher documents for malicious purposes, potentially as part of defense evasion or initial access.
This rule detects the creation of Microsoft Office files (Word documents, Excel spreadsheets) within the default startup folders for Microsoft Word and Excel. This technique can be used by adversaries to establish persistence, as these files will automatically execute or load when the respective Office application is launched. The rule specifically looks for file creations in paths containing '\Microsoft\Word\STARTUP' or '\Microsoft\Excel\XLSTART', and also considers paths containing both '\Office' and '\Program Files' along with '\STARTUP' or '\XLSTART'. It filters out legitimate creations by the Office applications themselves (WINWORD.exe, EXCEL.exe) to reduce false positives.
This rule detects the creation of a file named 'RemComSvc.exe', which is the default service executable name used by the RemCom utility. The presence of this file typically indicates the installation and execution of RemCom on a Windows system, often for remote administration or malicious purposes.
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