SigmaHQ Detections
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6,797 detections
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Detects the use of `systemctl mask` to disable system power management targets such as suspend, hibernate, or hybrid sleep. Adversaries may mask these targets to prevent a system from entering sleep or shutdown states, ensuring their malicious processes remain active and uninterrupted. This behavior can be associated with persistence or defense evasion, as it impairs normal system power operations to maintain long-term access or avoid termination of malicious activity.
This rule will collect the data needed to start looking into possible kerberoasting activity.
Further analysis or computation within the query is needed focusing on requests from one specific host/IP towards multiple service names within a time period of 5 seconds.
You can then set a threshold for the number of requests and time between the requests to turn this into an alert.
Further analysis or computation within the query is needed focusing on requests from one specific host/IP towards multiple service names within a time period of 5 seconds.
You can then set a threshold for the number of requests and time between the requests to turn this into an alert.
Detects potential credential harvesting attempts through LSASS memory dumps using ProcDump. This rule identifies suspicious command-line patterns that combine memory dump flags (-ma, -mm, -mp) with LSASS-related process markers. LSASS (Local Security Authority Subsystem Service) contains sensitive authentication data including plaintext passwords, NTLM hashes, and Kerberos tickets in memory. Attackers commonly dump LSASS memory to extract credentials for lateral movement and privilege escalation.
Detects the use of qoperation.exe with specific command-line arguments to write a JSP file to the webroot, indicating a webshell drop. This activity is associated with a post-authentication step related to CVE-2025-57790, which involves a path traversal vulnerability in Commvault.
This rule detects the use of 'wmic.exe' to perform system disk and volume reconnaissance. Specifically, it looks for command-line arguments related to querying volume names, logical disks, and general volume information. This activity has been observed in campaigns by threat actors such as Volt Typhoon.
Detects the execution of the 'sudo' command with the '--chroot' option, which is used to change the root directory for command execution. Attackers may use this technique to evade detection and execute commands in a modified environment. This can be part of a privilege escalation strategy, as it allows the execution of commands with elevated privileges in a controlled environment as seen in CVE-2025-32463. While investigating, look out for unusual or unexpected use of 'sudo --chroot' in conjunction with other commands or scripts such as execution from temporary directories or unusual user accounts.
Detects suspicious file writes to the root directory of web applications, specifically targeting Apache or Tomcat servers. This activity often indicates an attempt to deploy malicious files like web shells or other unauthorized scripts, potentially after exploiting a public-facing application.
This rule detects the use of various operating system utilities to discover local accounts, system owners, or users. It specifically looks for the execution of `whoami.exe`, `quser.exe`, `qwinsta.exe`, `wmic.exe` with 'useraccount' and 'get' in the command line, `cmdkey.exe` with the '/l' flag, `cmd.exe` executing 'dir \Users\', and `net.exe` or `net1.exe` with 'user' in the command line, while filtering out common legitimate uses of `net` and `cmd dir` commands.
This rule detects suspicious failed logon attempts by monitoring specific uncommon error codes. These error codes indicate issues such as logons to disabled accounts, attempts outside authorized hours, from unauthorized workstations, or due to trust relationship failures or insufficient logon rights. Such failures can suggest an adversary attempting to bypass security controls or test account validity and permissions.
Detects the use of argument injection in the Commvault qlogin command, specifically targeting CVE-2025-57791. An attacker can inject the `-localadmin` parameter via the password field to bypass authentication and gain a privileged token.
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