SigmaHQ Detections
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6,800 detections
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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.
This rule detects when 'regedit.exe' is used to export a registry key to an Alternate Data Stream (ADS). This technique can be used by adversaries to hide data, such as exported registry keys, within existing files to evade detection. The rule specifically looks for the execution of 'regedit.exe' which is a legitimate Windows utility, making the detection focused on its suspicious usage in conjunction with ADS.
Detects the creation of temporary files associated with Advanced IP Scanner, a tool often used by ransomware groups for network discovery. This rule specifically looks for the creation of files within the user's temporary directory that contain the string '\AppData\Local\Temp\Advanced IP Scanner 2'.
Detects non-standard tools initiating outbound connections over port 3389, which is commonly used for Remote Desktop Protocol (RDP). This activity can indicate possible lateral movement within a network. The rule filters out legitimate RDP clients and other known third-party tools to reduce false positives. An initial baseline of legitimate RDP tooling is required for effective use.
Detects svchost.exe initiating an outbound network connection on TCP port 3389 (RDP) to a loopback address (127.0.0.0/8 or ::1/128). This behavior is indicative of RDP traffic being tunneled, potentially via a reverse SSH tunnel, to bypass network restrictions or for covert remote access.
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