SigmaHQ Detections
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6,797 detections
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This rule detects the execution of common archiving utilities (zip, gzip, tar) on Linux systems. Adversaries often compress data prior to exfiltration to reduce its size and make it easier to transfer. This rule specifically looks for the 'execve' system call with 'zip', 'gzip -k', or 'tar -c' as the primary command and arguments.
Detects changes to the ESXi syslog configuration via the 'esxcli' command-line utility. This activity could indicate an adversary attempting to impair defenses by modifying logging configurations on an ESXi hypervisor.
Detects failed logon attempts to MSSQL server instances, which can indicate brute-force attacks, password guessing, or credential stuffing attempts against database accounts. This rule specifically looks for Event ID 18456 from MSSQL providers in the Windows Application event log.
This rule detects potential DCShadow attacks by looking for the creation of new Service Principal Names (SPNs) that contain 'GC/' in either Event ID 4742 (A computer account was changed) or Event ID 5136 (A directory service object was modified). DCShadow is a technique used by adversaries to register a rogue Domain Controller and manipulate Active Directory data.
Detects the creation of scheduled tasks by the Kapeka backdoor. This rule specifically looks for Event ID 4698 (A scheduled task was created) and then filters on specific content within the TaskContent field, including common Kapeka-related paths like ':\ProgramData\' or '\AppData\Local\', the presence of 'rundll32', '.wll', and '#1' in the command line, and task names such as 'OneDrive' or 'Sens Api'.
Detects the execution of hacktools developed by 'Cube0x0' by identifying the 'Company' field in the executable's PE metadata. This allows detection even if the tool's filename has been changed. Examples of tools by this author include SharpPrintNightmare, KrbRelay, and SharpMapExec, which are often used for credential access and resource development.
Detects the execution of the 'mount' command with the 'hidepid=2' option. This parameter is used to hide processes from other users on the system, which can be leveraged by adversaries for defense evasion by making their malicious processes less visible.
Detects potential exploitation attempt of CVE-2023-1389, an Unauthenticated Command Injection vulnerability in TP-Link Archer AX21 routers. The rule looks for specific URI patterns and keywords indicative of an attempt to inject commands via the 'country' parameter.
This rule detects the creation of specific files associated with the Kapeka backdoor. It looks for files created in common application data directories (ProgramData or AppData\Local) that have a 5-6 character alphanumeric name followed by a ".wll" extension. Additionally, it specifically looks for files named "win32log.exe" or "crdss.exe" in these locations, which are known indicators of the Kapeka backdoor. The Kapeka dropper disguises these files as legitimate to evade detection.
This rule detects network connections initiated by an executable to sub-domains associated with the "LocaltoNet" tunneling service. LocaltoNet is a reverse proxy that exposes localhost services to the internet. Adversaries have been observed leveraging this service for command-and-control (C2) activities, often to bypass multi-factor authentication (MFA) and perimeter security controls.
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