SigmaHQ Detections
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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.
This rule detects PowerShell script block text that contains commands indicative of searching for credentials in files. Specifically, it looks for the combination of 'ls' (list directory contents), '-R' (recursive search), 'select-string' (finds text in strings and files), and '-Pattern' (specifies the text pattern to find). This combination suggests an adversary is recursively searching files for specific patterns, likely credentials.
Detects the use of PowerShell commands or .NET methods to identify the current logged-in user on a Windows system. This activity is often performed by adversaries during the discovery phase to understand the environment.
This rule detects the use of the PowerShell cmdlet 'Unblock-File' with the '-Path' parameter. This cmdlet is used to remove the Zone.Identifier alternate data stream from a file, which marks it as downloaded from the internet. Adversaries may use this to bypass security warnings and execution restrictions associated with files downloaded from untrusted sources, often as part of a defense evasion strategy.
This rule detects PowerShell script block text containing "Win32_PnPEntity". This WMI class is used to query information about Plug and Play devices, which can include peripheral devices. Adversaries may use this to gather information about attached peripheral devices and components connected to a computer system for discovery purposes.
Detects when the CertOC.exe utility is used to download a file from a remote HTTP source. This behavior is indicative of an adversary using a living-off-the-land binary (LOLBIN) for ingress tool transfer.
Detects the execution of certutil.exe with specific flags ('urlcache' or 'verifyctl') in conjunction with an 'http' string in the command line, indicating an attempt to download files from a remote HTTP source. This technique is often used by adversaries for ingress tool transfer or to retrieve malicious payloads.
This rule detects potential NTLM coercion attempts using the built-in Windows utility 'certutil.exe'. Specifically, it looks for command-line executions of 'certutil.exe' that include both the '-syncwithWU' flag and a UNC path (indicated by '\\'). This combination is known to be abused by attackers to force a Windows machine to authenticate to an attacker-controlled server, thereby coercing it to send its NTLM hash.
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