SigmaHQ Detections
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6,800 detections
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Detects suspicious inbox manipulation rules that are set on a user's mailbox to delete or move messages or folders. This often indicates an attacker is trying to hide their activities or exfiltrate data by automatically moving emails.
Detects when Microsoft Cloud App Security reports activities performed by users whose accounts have been terminated in Azure AD, but are still active in other platforms like AWS or Salesforce. This is particularly relevant for accounts used to manage resources that might not be terminated when a user leaves the company.
This rule detects suspicious access to the camera and microphone by processes running from unusual or temporary locations. It monitors registry events related to the CapabilityAccessManager ConsentStore for non-packaged applications. Specifically, it looks for modifications to registry keys that indicate access to 'microphone' or 'webcam' from paths like temporary folders, the Recycle Bin, or public user directories. This behavior can be indicative of malware attempting to record audio or video without user consent.
This rule detects specific command-line activities associated with the Turla APT group's lateral movement and discovery tactics. It looks for the use of 'net use' to connect to administrative shares (specifically C$) with a hardcoded password, and 'dir' commands used for file and directory discovery, targeting document files and executables in the TEMP directory. These commands are indicative of an adversary attempting to move laterally within a network and gather information about the environment.
This rule detects suspicious error messages generated by various SQL database systems (Oracle, MySQL, SQL Server, SQLite) that are indicative of an attempted SQL injection attack. The rule looks for specific syntax error messages that are commonly returned when an attacker probes for SQL injection vulnerabilities.
This rule detects attempts to disable security tools on macOS systems. It specifically looks for the use of '/bin/launchctl' to 'unload' security-related plists (property list files) associated with common security software like Objective-See's LuLu and BlockBlock, Google Santa, Carbon Black, Little Snitch, Tenable Nessus, OpenDNS Umbrella, Crowdstrike Falcon, osquery, Filebeat, Auditbeat, Packetbeat, and td-agent. Additionally, it detects attempts to disable macOS Gatekeeper using '/usr/sbin/spctl' with the 'disable' argument.
Detects remote credential dumping activity using Impacket's secretdump tool by monitoring SMB file access patterns. Specifically, it looks for access to the ADMIN$ share with paths containing 'SYSTEM32\' and ending with '.tmp', which is characteristic of secretdump creating temporary files during its operation.
This rule detects attempts to access a Primary Refresh Token (PRT) resource within Azure. A PRT is a key artifact used for single sign-on (SSO) in Azure AD, allowing users to maintain their authenticated state across various applications and services. Unauthorized access to a PRT can enable an adversary to move laterally within an organization's Azure environment, perform credential theft, and bypass multi-factor authentication (MFA) to gain access to resources as the legitimate user. This detection specifically looks for the 'attemptedPrtAccess' risk event type reported by Azure's risk detection service.
Detects attempts to clear macOS system logs by identifying common commands used for file deletion ('rm', 'unlink', 'shred') when targeting known log directories such as '/var/log' or user-specific '/Users/*/Library/Logs/'. This activity is often performed by adversaries to remove evidence of their presence and actions on a compromised system.
This rule detects suspicious user agent strings commonly associated with various Advanced Persistent Threat (APT) groups and malware families. It specifically targets patterns found in proxy logs, indicating potential command and control (C2) communications or other malicious web activity. The rule includes a broad list of user agent strings linked to specific APTs like Backspace, GrizzlySteppe, Comment Crew, Naikon, Sofacy (Xtunnel, Zebrocy), Derusbi, Winnti, APT17, Bronze Butler (Daserf), TSCookie, Delphi downloader, VPNFilter, FELIXROOT, RMS, Cmstar, KerrDown, APT33 (PowerTon), Hidden Cobra, Strong Pity, Mustang Panda, BackdoorDiplomacy, SideWalk, LitePower (WRITE), ZINC, PlugX, and RedCurl.
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