SigmaHQ Detections
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Detects when an AWS EFS (Elastic File System) mount target is deleted. This action can disrupt applications or instances relying on the mounted file system, potentially leading to a denial of service or data unavailability.
Detects when an AWS ElastiCache security group has been created. This action can be used by adversaries to establish persistence or modify network access to ElastiCache resources.
This rule identifies when an Azure Virtual Network or Virtual Network Gateway is modified or deleted. This activity is captured through Azure Activity Logs, specifically looking for 'MICROSOFT.NETWORK/VIRTUALNETWORKGATEWAYS/' or 'MICROSOFT.NETWORK/VIRTUALNETWORKS/' operations that end with '/WRITE' or '/DELETE'. Such actions can indicate unauthorized changes to network infrastructure, potentially leading to denial of service, network segmentation bypass, or other security incidents.
This rule detects anomalous behavior based on suspicious sign-in activity across multiple tenants from different countries in the same browser. This indicates a potential compromise of user credentials or an attempt to bypass authentication mechanisms.
Detects when Microsoft Cloud App Security reports suspicious email forwarding rules, such as a user creating an inbox rule to forward copies of all emails to an external address. This activity can indicate an attempt to exfiltrate sensitive information.
This rule detects attempts to change file or folder permissions and ownership on Linux systems by monitoring the execution of the 'chmod' and 'chown' commands. These commands are commonly used by adversaries to modify access controls, potentially to evade defenses, gain access to protected files, or establish persistence.
This rule detects the loading of kernel modules using the 'insmod' command. Loadable Kernel Modules (LKMs) are code segments that can be dynamically loaded into and unloaded from the kernel. Adversaries may leverage LKMs for establishing persistence, elevating privileges, or deploying kernel-mode rootkits, as they operate with the highest system privileges (Ring 0). The detection specifically looks for the execution of 'kmod' with the 'insmod' command.
This rule detects the use of the 'import' command, part of ImageMagick, to capture screenshots on a Linux system. It specifically looks for executions of 'import' where the arguments indicate a full-screen capture (using '-window root') or a general screenshot saved to a common image file format (PNG, JPG, JPEG). This activity is often associated with adversaries attempting to collect visual information from a compromised system.
Detects suspicious DNS error messages that indicate a fatal or suspicious error that could be caused by exploiting attempts. Specifically looks for messages related to dropping source port zero packets, denied AXFR requests, and fatal errors causing an exit.
This rule detects the execution of the 'grep' command on Linux systems when it is used to search for specific filenames associated with the GobRAT malware. The filenames include 'apached', 'frpc', 'sshd.sh', and 'zone.arm'. This activity indicates that an attacker, potentially using GobRAT, is attempting to discover files related to their malware deployment or persistence mechanisms.
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