SigmaHQ Detections
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Detects the usage of the "Add-WindowsCapability" PowerShell cmdlet to install Windows capabilities. This rule specifically highlights the installation of "OpenSSH" related capabilities, which could be used for remote access.
Detects calls to "SyncInvoke" that is part of the "CL_Invocation.ps1" script to proxy execution using "System.Diagnostics.Process". This technique can be used to bypass application control and execute malicious code.
Detects the use of the Microsoft signed script "CL_mutexverifiers.ps1" to proxy the execution of additional PowerShell script commands. This technique can be used by adversaries for defense evasion by leveraging a trusted, signed script to execute malicious code.
This rule detects the usage of the 'ConvertTo-SecureString' cmdlet via the command line. This cmdlet is used to convert plain text into a secure string object, which can then be used to store sensitive information like passwords. While it has legitimate uses, its direct invocation from the command line is uncommon in typical user activity and can indicate suspicious behavior, potentially related to credential manipulation or obfuscation techniques by adversaries.
Detects the use of the PowerShell cmdlet "Enable-WindowsOptionalFeature" to enable potentially suspicious or insecure Windows features. This cmdlet functions similarly to DISM.exe for managing Windows features and packages. The rule specifically looks for the enablement of features like Telnet Server, Internet Explorer (optional), TFTP, SMB1 Protocol, Client-ProjFS, and Windows Subsystem for Linux, which might be enabled by adversaries for various purposes or represent a security risk if not intentionally used.
Detects specific combinations of encoding methods in PowerShell via the commandline, looking for patterns indicative of obfuscation techniques used to hide malicious PowerShell commands. This rule specifically targets the use of 'ToInt', 'ToDecimal', 'ToByte', 'ToUint', 'ToSingle', 'ToSByte', 'ToChar', 'ToString', 'String' in conjunction with PowerShell executables, or combinations of 'char' and 'join', or 'split' and 'join' in the command line.
This rule detects attempts to execute PowerShell code inline from a file. It specifically looks for command-line arguments that combine PowerShell execution commands like 'iex', 'Invoke-Expression', 'Invoke-Command', or 'icm' with file reading commands such as 'cat', 'get-content', or 'type', along with the '-raw' parameter. This combination suggests that a file's content is being read and then immediately executed as PowerShell code.
Detects the execution of the 'Get-Clipboard' PowerShell cmdlet via the command line interface. This cmdlet is used to retrieve the current content of the clipboard, which could be leveraged by adversaries for data collection.
Detects the use of the "Set-Service" PowerShell cmdlet to modify a service's Security Descriptor Definition Language (SDDL) to hide the service from standard enumeration utilities like "sc.exe" or "Get-Service". This technique leverages specific SDDL flags (DCLCWPDTSD) to restrict access and visibility, primarily effective in PowerShell 7 environments.
Detects PowerShell scripts that use the "Compress-Archive" Cmdlet to compress folders and files, storing the output in potentially suspicious locations often used by malware for exfiltration. This activity indicates an adversary might be compressing collected data (e.g., sensitive documents) prior to exfiltration to make it portable and minimize network data transfer.
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