SigmaHQ Detections
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6,800 detections
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This rule detects sign-in attempts originating from IP addresses that have been identified as infected with malware. These malware-infected IP addresses are known to actively communicate with bot servers, indicating a high risk of compromise or malicious activity associated with the sign-in.
This rule detects user activity that Azure AD Identity Protection has flagged as 'investigationsThreatIntelligence'. This risk event type indicates that a sign-in or user behavior is unusual for the user or consistent with known attack patterns, often leveraging threat intelligence feeds to identify suspicious activity. It suggests potential compromise of user accounts or malicious sign-in attempts.
This rule identifies when a DNS Zone is either modified or deleted within Google Cloud Platform. This activity is captured through specific Google Cloud DNS API calls: 'Dns.ManagedZones.Delete', 'Dns.ManagedZones.Update', and 'Dns.ManagedZones.Patch'. Such actions can indicate malicious activity aimed at disrupting services or redirecting traffic, or legitimate administrative changes.
This rule identifies activities related to Google Cloud Platform (GCP) Packet Mirroring. Packet Mirroring allows capturing full network traffic, which can be abused by adversaries to intercept and collect sensitive data from unencrypted internal network communications. The rule specifically looks for various API calls related to the creation, modification, deletion, or listing of Packet Mirroring configurations.
This rule detects the execution of the 'cat' command used to append a zip file to an image file. This technique is commonly used in steganography to hide data within seemingly innocuous files. The rule specifically looks for 'cat' being executed with two arguments: one ending in a common image file extension ('.jpg' or '.png') and another ending in '.zip'. This pattern suggests an attempt to concatenate the contents of a zip file onto an image file.
Detects the use of the 'steghide' utility to extract hidden files from image files (JPG or PNG). Adversaries may use steganography to conceal data and evade detection.
Detection rule generated by AI system
Detects attempts to exploit the Shellshock vulnerability (CVE-2014-6271) by looking for specific shellshock expressions in log files. These expressions are commonly used to inject and execute arbitrary commands.
Detects suspicious VSFTPD error messages that indicate a fatal or suspicious error that could be caused by exploiting attempts. These errors often suggest malformed requests or attempts to trigger vulnerabilities in the VSFTPD service.
Detects potential overwriting and deletion of a file using the 'dd' command. This rule specifically looks for executions of 'dd' where the output file ('of=') is specified and the input is either '/dev/zero' (writing zeros) or '/dev/null' (effectively truncating/deleting content). This pattern is commonly used for data destruction.
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