SigmaHQ Detections
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6,797 detections
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Detects when a Google Cloud Storage bucket is modified or deleted. This includes operations such as deleting a bucket, inserting (creating) a bucket, or updating/patching a bucket's properties. Such activities can indicate unauthorized access, data manipulation, or attempts to disrupt services.
This rule detects changes to critical Linux auditd configuration files. Adversaries may modify these files to disable or alter auditing, thereby hindering detection of their malicious activities. Monitoring these files for changes can help identify attempts to evade security monitoring.
Detects the creation of a new named pipe using the "mkfifo" utility in a potentially suspicious location, specifically within the /tmp/ directory. Named pipes can be used for inter-process communication and their creation in temporary directories might indicate malicious activity such as local privilege escalation or data exfiltration.
Detects the execution of the 'userdel' binary, which is used to delete a user account and associated files. This activity can be abused by threat actors to remove accounts, hindering forensic analysis and covering their tracks.
Detects the usage of the 'find' command on macOS with specific permission-related arguments. These arguments are often used by attackers during discovery phases to locate files with unusual permissions, such as SUID/SGID binaries or world-writable files, which could indicate potential privilege escalation vectors or misconfigurations.
This rule detects HTTP POST requests that exhibit characteristics commonly associated with the Empire post-exploitation framework. Specifically, it looks for a combination of a distinct user-agent string ('Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko') and specific URI paths ('/admin/get.php', '/news.php', '/login/process.php'). This pattern is indicative of an Empire agent communicating with its command and control server.
This rule detects Cobalt Strike Malleable C2 profile patterns by analyzing HTTP proxy logs. It looks for specific User-Agent strings, HTTP methods (GET/POST), URIs, and hostnames that are characteristic of known Cobalt Strike profiles, including those mimicking Amazon, generic browsers, OCSP, and OneDrive traffic. The rule aims to identify command and control communications attempting to blend in with legitimate web traffic.
Detects suspicious User-Agent strings that appear to be Base64 encoded. This pattern has been observed in some malware, such as YamaBot, to obfuscate the true User-Agent. The rule specifically looks for Base64 encoded prefixes of common browser User-Agents like 'Chrome', 'AppleWebKit', 'Dalvik', and 'Mozilla', with an offset to account for potential padding variations.
This rule detects potential exploitation attempts of CVE-2021-42287, a vulnerability related to Active Directory's SAM Account Name Spoofing. The exploit involves an attacker creating a computer object with known credentials, then clearing its ServicePrincipalName attribute. This manipulation grants the attacker additional permissions on the object, enabling further changes. The detection specifically looks for Event IDs 16990 (Object class and UserAccountControl validation failure) and 16991 (SAM Account Name validation failure) from the Microsoft-Windows-Directory-Services-SAM provider, which indicate issues during the creation or modification of Active Directory objects that are characteristic of this attack.
This rule detects blocked attempts to modify Microsoft Defender Antivirus settings when Tamper Protection is enabled. Specifically, it looks for Event ID 5013 from the Windows Defender service, which indicates that Tamper Protection has blocked a change to Defender's configuration. The rule targets attempts to disable key features such as AntiSpyware, AntiVirus, archive scanning, network file scanning, real-time monitoring, behavior monitoring, IOAV protection, and script scanning by monitoring specific registry value paths.
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