SigmaHQ Detections
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6,800 detections
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Detects changes to the security groups associated with an Elastic Load Balancer (ELB) or Application Load Balancer (ALB). This can indicate that a misconfiguration allowing more traffic into the system than required, or could indicate that an attacker is attempting to enable new connections into a VPC or subnet controlled by the account.
Identifies when a network security configuration in Azure is modified or deleted. This could indicate an adversary attempting to bypass security controls, establish persistence, or impact the availability of resources.
Detects the execution of the Bash shell with the '-i' flag, which indicates an interactive shell. This is commonly used in reverse shells or other scenarios where an attacker wants to interact with the compromised system.
Detects the use of common network scanning tools like netcat, nmap, and telnet on macOS systems. The rule specifically looks for process creation events where the image path ends with '/nc', '/netcat', '/nmap', or '/telnet'. It includes a filter to exclude 'netcat' commands containing 'l' (often used for legitimate listening modes), aiming to reduce false positives related to simple network listening.
Detects the usage of tooling to sniff network traffic. An adversary may place a network interface into promiscuous mode to passively access data in transit over the network, or use span ports to capture a larger amount of data.
Detects Border Gateway Protocol (BGP) authentication failures, which can indicate attempts to brute force BGP peer authentication. Such attacks aim to manipulate routing information, potentially leading to traffic redirection or denial of service.
Detects an attempt to install an AppX package that fails due to a signing requirement error (0x80073cff). This error indicates that the package is not properly signed, which can be a characteristic of suspicious or malicious applications attempting to bypass security measures.
Detects when an application exports a certificate (and potentially the private key as well) from the local Windows certificate store. This activity can be indicative of an adversary attempting to steal authentication certificates for various malicious purposes, including lateral movement, persistence, or privilege escalation.
Detects service ticket requests using the weak RC4 encryption type (0x17) for Kerberos, which is often abused in Kerberoasting attacks. The rule specifically looks for Event ID 4769 (A Kerberos service ticket was granted) where the TicketOptions indicate a forwardable and renewable ticket, and the TicketEncryptionType is RC4. It attempts to reduce false positives by excluding service names ending with a dollar sign, which are typically machine accounts.
Detects suspicious scheduled task creation events by analyzing the task content for unusual paths (e.g., temporary directories, user-writable locations) and the presence of commonly abused command-line utilities or scripting interpreters. This rule aims to identify persistence or execution mechanisms leveraging scheduled tasks.
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