SigmaHQ Detections
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Detects attempts to decompress Gzip archives using PowerShell's GZipStream::Decompress method. This technique can be used by adversaries to unpack malicious payloads that have been compressed to evade detection.
This rule detects the use of PowerShell cmdlets to exfiltrate email addresses. Specifically, it looks for PowerShell processes executing commands that include 'Add-PSSnapin', 'Get-Recipient', '-ExpandProperty', 'EmailAddresses', 'SmtpAddress', and '-hidetableheaders'. This combination of cmdlets is indicative of an attempt to enumerate and extract email addresses from a system, likely for exfiltration purposes.
Detects the deletion of Windows Volume Shadow Copies using PowerShell with WMI (Get-WmiObject/Get-CimInstance) or CIM (Remove-WmiObject/Remove-CimInstance) commands. This technique is commonly employed by ransomware families like Sodinokibi/REvil to prevent system recovery.
Detects the execution of the AdvancedRun utility, which can be used to launch applications with different user permissions, including SYSTEM, or with modified environment variables. This utility is often used for legitimate administrative tasks but can also be leveraged by adversaries for privilege escalation or defense evasion, particularly by running processes with hidden windows.
Detects the execution of the NSudo utility, a tool that allows users to run programs with elevated privileges such as System, Trusted Installer, or with all privileges enabled. The rule specifically looks for NSudo executable names and common command-line arguments used to request these elevated privileges.
Detects the use of the rcedit tool to modify Portable Executable (PE) metadata properties such as OriginalFileName, CompanyName, FileDescription, ProductName, ProductVersion, and LegalCopyright. This activity could indicate an attempt to conceal the true nature of an executable, potentially for defense evasion by masquerading as a legitimate utility or by removing indicators from malicious tools.
Detects the execution of a renamed version of the "Mavinject" process. Mavinject.exe is a legitimate Microsoft utility that can be abused to perform process injection, often using the "/INJECTRUNNING" flag. This rule specifically looks for instances where the original file name (mavinject32.exe or mavinject64.exe) does not match the executed image name, indicating a potential rename for defense evasion.
Detects the execution of a renamed MegaSync.exe, which has been observed in use by ransomware families such as Nefilim, Sodinokibi (REvil), Pysa, and Conti. The rule specifically looks for processes where the original filename metadata is 'megasync.exe' but the executed image path does not end with '\megasync.exe', indicating a renaming event.
This rule detects the execution of `rundll32.exe` with the `InstallScreenSaver` command-line argument. This technique can be abused by attackers to execute arbitrary applications as a screensaver file (.scr) for defense evasion, as `rundll32.exe` is a legitimate Windows utility. The rule specifically looks for `rundll32.exe` (or its original filename) and the `InstallScreenSaver` string in the command line.
Detects the stopping of a Windows service using the built-in 'sc.exe' utility. This rule specifically looks for process creation events where 'sc.exe' is executed with the 'stop' command-line argument. While 'sc.exe' is a legitimate system tool, its use to stop services can be indicative of malicious activity, especially when combined with other suspicious behaviors, as adversaries may stop services to disrupt operations, evade defenses, or facilitate data destruction/encryption.
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