SigmaHQ Detections
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Identifies when an admission controller is executed in GCP Kubernetes. A Kubernetes Admission controller intercepts, and possibly modifies, requests to the Kubernetes API server. The behavior of this admission controller is determined by an admission webhook (MutatingAdmissionWebhook or ValidatingAdmissionWebhook) that the user deploys in the cluster. An adversary can use such webhooks as the MutatingAdmissionWebhook for obtaining persistence in the cluster. For example, attackers can intercept and modify the pod creation operations in the cluster and add their malicious container to every created pod. An adversary can use the webhook ValidatingAdmissionWebhook, which could be used to obtain access credentials. An adversary could use the webhook to intercept the requests to the API server, record secrets, and other sensitive information.
Detects successful RDP logons originating from public IP addresses. This can indicate an exposed RDP port being accessed externally, potentially by an attacker.
This rule detects the remote creation of scheduled tasks by monitoring access to the 'ATSVC' named pipe within the IPC$ share. Specifically, it looks for Event ID 5145, indicating a detailed file share access, where the ShareName is '\\*\IPC$', the RelativeTargetName is 'atsvc', and the AccessList contains 'WriteData'. This activity is characteristic of tools like 'at.exe' or direct API calls used to schedule tasks remotely.
Detects the load of the WinRing0 driver, which is known to be vulnerable and has been exploited by threat actors, crypto miners (like XMRIG), and other malware for privilege escalation. The detection is based on specific file names or a known IMPHASH associated with the driver.
This rule detects the execution of various hack tools and scripts commonly used for SMB relay attacks and privilege escalation on Windows systems. It specifically looks for process creations or command-line arguments associated with tools like PetitPotam, RottenPotato, HotPotato, JuicyPotato, Responder, ntlmrelayx, and smbrelayx, as well as PowerShell scripts like Invoke-Tater and Invoke-PetitPotam. The rule aims to identify attempts to exploit NTLM relay vulnerabilities to gain elevated privileges or access credentials.
This rule detects the execution of Kali Linux through Windows Subsystem for Linux (WSL). It identifies processes whose image paths contain typical Kali Linux installation directories within AppData or Program Files, or processes named 'kali.exe' or containing 'KaliLinux' in their image or command line, especially when their parent process is 'wsl.exe' or 'wslhost.exe'. The rule filters out common installation or uninstallation commands to reduce false positives.
Detects the execution of rundll32 that leads to the invocation of legitimate Windows binaries. The malware Pikabot has been seen to use this technique for process hollowing through hard-coded Windows binaries.
Detects suspicious child processes spawned by SAP NetWeaver on Linux systems that could indicate potential exploitation of a vulnerability that allows arbitrary execution via webshells, such as CVE-2025-31324. The rule looks for common shell interpreters, scripting languages, and network utilities being executed from specific SAP NetWeaver directories.
Detects the import of SSH key pairs into AWS EC2, which may indicate an attacker attempting to gain unauthorized access to instances. This activity could lead to initial access, persistence, or privilege escalation, potentially compromising sensitive data and operations.
Detects when new credentials (certificates or secrets) are added to an existing application or service principal within Azure/Entra ID. This activity, if not part of expected workflows, could indicate a malicious actor establishing persistence or escalating privileges by adding their own credentials to an application.
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