SigmaHQ Detections
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This rule detects the creation or modification of cron files or files within standard cron directories on Linux systems. Adversaries often abuse the cron utility to establish persistence or schedule malicious tasks for execution at specific times or intervals. Monitoring these file events can help identify unauthorized scheduling of tasks.
Detects potential exploitation of the PwnKit vulnerability (CVE-2021-4034) by looking for specific keywords in authentication logs. The rule identifies attempts to execute 'pkexec' with suspicious environment variable content and specific user/TTY information, indicative of a local privilege escalation attempt.
This rule detects the execution of 'GUP.exe' (Notepad++ updater) from any directory other than its legitimate installation paths within 'Program Files' or user-specific 'AppData' folders. This behavior is often indicative of DLL side-loading attacks where a malicious GUP.exe might be placed in a controlled directory to load a malicious DLL.
This rule detects when a user successfully elevates their permissions to manage all Azure Subscriptions. This action grants broad access across the Azure environment and should be immediately investigated if it is not a planned administrative activity. Such an elevation could be leveraged by an attacker to gain extensive control over Azure resources.
Detects the creation of a new user account with privileged User ID (UID) or Group ID (GID) on Linux systems, specifically targeting root (UID=0, GID=0), wheel (GID=10), or sudo (GID=27) groups. This rule monitors logs for `useradd` events indicating the creation of users with these elevated privileges.
Detects the execution of SharpUp, a tool used for local privilege escalation. The rule specifically looks for the executable name 'SharpUp.exe' or the description 'SharpUp', combined with command-line arguments indicative of its privilege escalation enumeration capabilities, such as 'HijackablePaths', 'UnquotedServicePath', 'ProcessDLLHijack', 'ModifiableServiceBinaries', 'ModifiableScheduledTask', 'DomainGPPPassword', and 'CachedGPPPassword'.
Detects the installation of the Kali Linux distribution through Windows Subsystem for Linux (WSL). Attackers may use Kali Linux WSL to leverage its penetration testing tools and capabilities for malicious purposes.
Detects potential exploitation of remote code execution vulnerability CVE-2025-33053 by monitoring suspicious image loads from WebDAV paths. The exploit involves malicious executables from attacker-controlled WebDAV servers loading Windows system DLLs like gdi32.dll, netapi32.dll, etc.
This rule detects the creation of temporary files within the WebDAV TfsStore directory that have suspicious file extensions. Attackers can leverage WebDAV to force authentication or to drop malicious files onto a system. The presence of executable or archive file extensions in this specific temporary directory is highly indicative of malicious activity, potentially related to initial access or resource development.
This rule detects modifications to Active Directory user accounts that could enable an attacker to control another user's or computer's account without needing their credentials. Specifically, it looks for changes to attributes related to delegation, such as 'msDS-AllowedToDelegateTo' and 'msDS-AllowedToActOnBehalfOfOtherIdentity', or the 'servicePrincipalName' attribute for user objects, which can be abused for Kerberoasting or other delegation attacks. Event ID 4738 indicates a user account was changed, and Event ID 5136 indicates a directory service object was modified.
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