Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects PowerShell commands that attempt to store data in an Alternate Data Stream (ADS) by redirecting the output of a command executed via `cmd.exe` (comspec) into a file using the `>` operator. This technique is often used by malware, such as Astaroth, to hide malicious data within legitimate files, making it harder to detect.
This rule detects the execution of PowerShell cmdlets related to 'TroubleshootingPack' with specific arguments, which could indicate an attempt to leverage vulnerabilities like CVE-2022-30190 (Follina) or similar techniques used by the 'msdt' LOLBIN (Living Off the Land Binaries). The detection specifically looks for the combination of 'Invoke-TroubleshootingPack', the path 'C:\Windows\Diagnostics\System\PCW', '-AnswerFile', and '-Unattended' within the PowerShell script block text. This pattern is indicative of an attempt to execute diagnostic packages in an unattended manner, often exploited for arbitrary code execution.
Detects PowerShell scripts that use the System.Net.WebClient class to download files or strings from the internet. This is a common technique used by adversaries to retrieve malicious payloads or additional tools.
Detects PowerShell code that uses `GetTypeFromCLSID` in conjunction with `.ShellExecute(` to execute COM objects. This technique can be used for persistence or privilege escalation by adversaries.
This rule detects PowerShell scripts attempting to open a handle to a drive volume using the `IO.FileStream` object and the `\\.\` DOS device path specifier. This technique is often used for direct access to the volume, bypassing standard file system controls.
This rule detects suspicious PowerShell script blocks that contain specific .NET classes often used in LDAP-based credential access attempts. The presence of 'System.DirectoryServices.Protocols.LdapDirectoryIdentifier', 'System.Net.NetworkCredential', and 'System.DirectoryServices.Protocols.LdapConnection' within a PowerShell script block suggests an attempt to interact with an LDAP directory, potentially for password guessing or brute-force attacks against accounts.
This rule detects PowerShell commands that perform reconnaissance activities (getting services, child items, or processes) and redirect their output to a file in the temporary directory. This behavior is indicative of an adversary collecting internal system information for potential exfiltration or further analysis.
This rule detects the use of 'X509Enrollment' objects within PowerShell scripts. Adversaries may use X509Enrollment to install root certificates, which can be leveraged to bypass security warnings when connecting to adversary-controlled web servers or to sign malicious code, thereby subverting trust controls and enabling defense evasion.
Detects the execution of the Microsoft-signed PowerShell script 'Launch-VsDevShell.ps1' with specific command-line arguments ('VsWherePath ' or 'VsInstallationPath '). This script can be abused to proxy the execution of other commands, potentially for defense evasion.
This rule detects command-line executions that include specific function calls, 'LoadAssemblyFromPath' or 'LoadAssemblyFromNS', which are associated with the 'CL_LoadAssembly.ps1' script. This script can be leveraged to load .NET assemblies, potentially bypassing AppLocker controls and executing arbitrary code. The detection focuses on instances where these function calls are made directly via command-line arguments, such as through PowerShell's '-Command' or '-ScriptBlock' flags.
This rule detects the execution of PowerShell or PowerShell Core (pwsh.exe) with command-line arguments indicative of base64 encoded commands. Adversaries often use base64 encoding to obfuscate malicious PowerShell scripts, making them harder to detect by simple string matching. The rule specifically looks for common encoding flags such as '-e', '-en', '-enc', '-enco', or '-ec'. It filters out legitimate uses of '-Encoding' and activity from Azure Guest Configuration worker processes to reduce false positives.
Detects calls to PowerShell cmdlets used to export certificates from the local certificate store. Threat actors have been observed abusing this technique to steal private keys from compromised machines, which can then be used for authentication or decryption.
This rule detects attempts to dump credentials from the Windows Credential Manager using PowerShell. It specifically looks for the use of known PowerShell functions or code patterns associated with credential dumping tools or techniques. This includes functions like 'Get-PasswordVaultCredentials' and 'Get-CredManCreds', as well as the instantiation of .NET objects related to 'Windows.Security.Credentials.PasswordVault' or specific CSharpCodeProvider patterns often used in reflective loading or dynamic compilation for credential access.
Detects the usage of `[Reflection.Assembly]::load` functions within PowerShell script block logs. This method allows for dynamically loading assemblies into memory, which can be used by adversaries to execute malicious code without writing it to disk, thus evading traditional file-based detections.
This rule detects the execution of a PowerShell command that specifically enumerates browser bookmarks. It looks for the use of 'Get-ChildItem' with parameters '-Recurse', '-Path', '-Filter Bookmarks', '-ErrorAction SilentlyContinue', and '-Force'. This activity is indicative of an adversary attempting to discover information about the compromised host by collecting browser bookmark data, which can reveal personal information or details about internal network resources.
This rule detects the execution of the Invoke-DNSExfiltrator PowerShell cmdlet, which is used for exfiltrating data over a DNS request covert channel. The detection specifically looks for the presence of the cmdlet name along with common parameters such as '-i', '-d', '-p', '-doh', and '-t', indicating an attempt to use the DNSExfiltrator tool.
This rule detects the execution of PowerShell commandlets and functions associated with the Nishang exploitation framework. Nishang is a collection of PowerShell scripts and functions that enable penetration testers to use PowerShell for offensive security tasks. The rule specifically looks for a comprehensive list of known Nishang commandlet names and arguments within PowerShell script block logs. Detection of these strings indicates potential malicious activity, including credential dumping, persistence mechanisms, exfiltration, and remote code execution.
Detects the execution of PowerShell cmdlets associated with PowerView, a reconnaissance tool within the PowerSploit framework. This rule specifically looks for a comprehensive list of PowerView cmdlets within PowerShell script block logs, indicating potential adversary activity related to discovery and information gathering in an Active Directory environment.
Detects the use of 'PSAsyncShell', an asynchronous TCP reverse shell written in PowerShell. The rule specifically looks for the string 'PSAsyncShell' within PowerShell script block logs, indicating the execution or presence of this specific tool.
This rule detects the execution of PowerShell scripts containing specific Base64 encoded shellcode signatures. The rule looks for the presence of 'OiCAAAAYInlM' or 'OiJAAAAYInlM' within the ScriptBlockText, which are known indicators of shellcode.
This rule detects the execution of specific PowerShell commandlets associated with the ShellIntel exploitation framework. These commandlets, such as 'Invoke-SMBAutoBrute', 'Invoke-GPOLinks', and 'Invoke-Potato', are commonly used for reconnaissance, privilege escalation, and lateral movement within a Windows environment. Detection relies on PowerShell Script Block Logging to capture the script text containing these commandlet names.
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