SigmaHQ Detections
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Detects suspicious execution of rundll32.exe with specific DLLs and functions that are known to be abused for defense evasion and arbitrary code execution, often referred to as Living Off The Land Binaries (LOLBINs). The rule identifies various combinations of DLLs (e.g., url.dll, zipfldr.dll, shell32.dll, mshtml.dll, advpack.dll, ieadvpack.dll, ieframe.dll, shdocvw.dll, syssetup.dll, setupapi.dll, pcwutl.dll, dfshim.dll, scrobj.dll, shimgvw.dll, comsvcs.dll) and their associated functions that can be used to execute scripts, open URLs, or perform other actions in an unexpected manner via rundll32.exe. It includes filters to reduce false positives from legitimate system activities like screensaver or control panel operations.
This rule detects the execution of the `takeown.exe` utility with the `/f` (force) and `/r` (recursive) flags. Adversaries may use `takeown.exe` to gain ownership of files or directories, especially when combined with recursive operations, to bypass access controls and modify permissions. This action can be a precursor to further malicious activities such as modifying system files, installing persistence mechanisms, or exfiltrating data.
Detects the execution of the 'wpbbin.exe' binary located in 'C:\Windows\System32\'. This binary is associated with a UEFI-based persistence method, as described in the provided references, which allows for the injection of executable files into BitLocker-protected drives.
Detects the exploitation of Zoho ManageEngine Desktop Central Java Deserialization vulnerability (CVE-2020-10189) by monitoring for suspicious child processes spawned by the Java executable associated with Desktop Central. This exploitation often leads to the execution of command-line utilities for further compromise.
Detects exploitation attempts targeting the F5 BIG-IP vulnerability CVE-2020-5902. The rule looks for specific URI query patterns indicative of directory traversal within the '/tmui/' or '/hsqldb' paths, which are known to be vulnerable.
Detects a specific process tree pattern associated with Trickbot malware, where 'rundll32.exe' acts as the parent process for 'wermgr.exe', and the parent command line contains 'DllRegisterServer'. This pattern indicates the execution of a DLL via rundll32.exe, which then launches wermgr.exe, a known behavior of Trickbot.
This rule detects DNS queries to specific malicious domains associated with the GALLIUM threat group, as identified by Microsoft Threat Intelligence Center in December 2019. The rule specifically looks for Event ID 257 in the Microsoft-Windows-DNS-Server/Analytical log, where the queried domain name (QNAME) matches a predefined list of indicators.
Detects the exploitation of the VMware vSphere Remote Code Execution vulnerability (CVE-2021-21972) by identifying HTTP POST requests to the '/ui/vropspluginui/rest/services/uploadova' endpoint. This specific URI indicates an attempt to upload a malicious OVA file, which is the vector for the RCE.
Detects the creation of specific files associated with the Small Sieve malware. This includes files with a characteristic typo ('Microsift' instead of 'Microsoft') in their path or a specific filename ('MicrosoftWindowsOutlookDataPlus.txt') in the AppData\Local directory, which are indicators of the Small Sieve malware's activity.
Detects a specific image load pattern where 'svchost.exe' loads 'clfsw32.dll'. This pattern has been observed in the context of a tool named PRIVATELOG, which is associated with advanced persistent threat (APT) activities, and is considered rare under legitimate circumstances. This behavior could indicate process injection or other forms of defense evasion.
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