SigmaHQ Detections
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6,800 detections
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Detects suspicious invocation of the Get-ADDBAccount PowerShell script that reads from an ntds.dit file. This technique can be used to gain access to credentials without relying on traditional credential dumping tools. The rule specifically looks for the presence of 'Get-ADDBAccount', 'BootKey', and 'DatabasePath' in the PowerShell payload, indicating an attempt to extract credentials from an NTDS database file.
Detects various obfuscated PowerShell IEX (Invoke-Expression) invocation patterns generated by the Invoke-Obfuscation framework. The rule specifically looks for unique string manipulation techniques used by Invoke-Obfuscation to construct PowerShell commands, often involving concatenation of environment variables or special PowerShell variables and their indices.
Detects PowerShell scripts that utilize compression and decompression techniques, specifically looking for 'new-object', 'text.encoding]::ascii', 'system.io.compression.deflatestream', 'system.io.streamreader', and 'readtoend' in the payload. This pattern is indicative of obfuscated PowerShell often used by tools like Invoke-Obfuscation to hide malicious code.
Detects obfuscated PowerShell commands that utilize 'clip.exe' to interact with the clipboard, often as part of an obfuscation technique like those used by Invoke-Obfuscation. The rule specifically looks for patterns where 'echo' is piped to 'clip' and then followed by terms related to 'Clipboard' or 'invoke' with potential character obfuscation.
Detects obfuscated PowerShell execution leveraging MSHTA. This technique is often used for defense evasion by adversaries to execute malicious scripts without directly invoking PowerShell. The rule specifically looks for a combination of keywords indicative of this method, including 'set', '&&', 'mshta', 'vbscript:createobject', '.run', and '(window.close)' within the PowerShell module payload.
Detects suspicious PowerShell commands that utilize 'System.Net.WebClient' to download files or strings from the internet. This technique is commonly used by adversaries for ingress tool transfer or to fetch additional malicious payloads.
This rule detects the usage of the 'Add-WindowsCapability' PowerShell cmdlet, specifically looking for attempts to add Windows capabilities. It explicitly targets the addition of 'OpenSSH' related capabilities (both 'OpenSSH.Server' and 'OpenSSH.Client'). This activity could indicate an adversary attempting to install tools for remote access or other malicious purposes.
This rule detects the use of `System.DirectoryServices.AccountManagement` within PowerShell script block logs. This .NET namespace is commonly used to programmatically manage Active Directory security principals such as users, computers, and groups. Adversaries may use this method to create new domain accounts, modify existing ones, or manipulate group memberships to establish persistence or elevate privileges within an Active Directory environment.
Detects PowerShell scripts that enumerate installed hotfixes by querying 'Win32_QuickFixEngineering' and looking for 'HotFixID'. This activity is often performed by attackers during the discovery phase to gather system information.
Detects obfuscated PowerShell execution using environment variables, specifically looking for patterns indicative of Invoke-Obfuscation's VAR+ launcher. This technique involves setting environment variables with parts of a command and then reconstructing and executing it, often to evade detection.
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