Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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The following analytic detects the use of 'schtasks.exe' to schedule forced system reboots using the 'shutdown' and '/create' flags. It leverages endpoint process data to identify instances where these specific command-line arguments are used. This activity is significant because it may indicate an adversary attempting to disrupt operations or force a reboot to execute further malicious actions. If confirmed malicious, this could lead to system downtime, potential data loss, and provide an attacker with an opportunity to execute additional payloads or evade detection.
The analytic detects suspicious command lines that append user entries to `/etc/at.allow` or `/etc/at.deny` files on Linux systems. This activity is significant because altering these configuration files can allow attackers to schedule tasks with elevated permissions, facilitating persistence on a compromised Linux host. If confirmed malicious, this could enable attackers to execute arbitrary code at scheduled intervals, potentially leading to further system compromise and unauthorized access to sensitive information. The rule specifically looks for `echo` commands writing to these files.
The following analytic detects the creation or modification of Windows Scheduled Tasks related to CompMgmtLauncher or Eventvwr. These legitimate system utilities, used for launching the Computer Management Console and Event Viewer, can be abused by attackers to execute malicious payloads under the guise of normal system processes. By leveraging these tasks, adversaries can establish persistence or elevate privileges without raising suspicion. This detection helps security analysts identify unusual or unauthorized scheduled tasks involving these executables, allowing for timely investigation and remediation of potential threats.
The following analytic detects the creation and deletion of scheduled tasks within a short time frame (less than 30 seconds) using Windows Security EventCodes 4698 and 4699. This behavior is identified by analyzing Windows Security Event Logs. Such activity is significant as it may indicate lateral movement or remote code execution attempts by adversaries. If confirmed malicious, this could lead to unauthorized access, data exfiltration, or execution of malicious payloads, necessitating prompt investigation and response by security analysts.
Detects the creation of a scheduled task that runs weekly and executes the "shutdown /l /f" command. This behavior has been observed being used by KamiKakaBot samples to achieve persistence on a system.
This rule detects the creation, modification, or deletion of scheduled tasks using specific task names known to be associated with the SVR-attributed GraphicalProton backdoor. The task names are designed to mimic legitimate Windows services to evade detection.
Detects the execution of specific processes and command line combinations associated with the Forest Blizzard APT group. This includes the creation and deletion of scheduled tasks using 'schtasks.exe' and PowerShell commands for file operations, as described by Microsoft.
This rule detects the creation, modification, or deletion of scheduled tasks with specific names known to be used by the SVR-affiliated GraphicalProton backdoor. The rule monitors Windows Security Event IDs 4698 (A scheduled task was created), 4699 (A scheduled task was deleted), and 4702 (A scheduled task was updated) for a predefined list of suspicious task names.
Detects the creation of a scheduled task in the Windows Registry that is specifically associated with the Diamond Sleet APT group. This activity is linked to their exploitation of the TeamCity CVE-2023-42793 vulnerability, where they create a scheduled task named 'Windows TeamCity Settings User Interface' to establish persistence or execute malicious code.
Detects the creation of a scheduled task named '\Windows TeamCity Settings User Interface' with a specific content string 'uTYNkfKxHiZrx3KJ'. This activity has been linked to the Diamond Sleet APT group exploiting the TeamCity CVE-2023-42793 vulnerability for execution, persistence, and privilege escalation.
Detects suspicious scheduled task creation events by analyzing the task content for unusual paths (e.g., temporary directories, user-writable locations) and the presence of commonly abused command-line utilities or scripting interpreters. This rule aims to identify persistence or execution mechanisms leveraging scheduled tasks.
This rule identifies the creation or modification of Kubernetes Jobs or CronJobs within a Google Cloud environment. Adversaries may use these scheduled tasks to maintain persistence, execute malicious code, or escalate privileges within a Kubernetes cluster by scheduling containers to run at specific times or intervals.
Identifies when an Azure Kubernetes CronJob or Job is created or modified in Azure Cloud. Adversaries may use Kubernetes CronJobs or Jobs for scheduling execution of malicious code that would run as a container in the cluster, establishing persistence or executing malicious tasks.
Detects the creation or modification of scheduled cron jobs where the command line argument contains '/tmp/'. This behavior is often indicative of an adversary attempting to establish persistence or execute malicious code from a temporary directory using the cron utility.
Detects the creation of a scheduled task using common command-line patterns associated with PowerSploit or Empire's default configurations. This rule specifically looks for `schtasks.exe` being executed by PowerShell with parameters indicative of task creation, including specific task names like 'Updater' and common scheduling triggers.
This rule detects the creation of scheduled tasks by monitoring specific registry key paths associated with the Windows Task Scheduler. Adversaries often use scheduled tasks for persistence, privilege escalation, or execution of malicious code. By observing modifications to these registry paths, the rule aims to identify when new scheduled tasks are being registered on a system.
Detects the creation of a scheduled task by monitoring file creation events in the standard Windows scheduled task directories. This rule specifically looks for new files being written to ':\Windows\System32\Tasks\', ':\Windows\SysWOW64\Tasks\', and ':\Windows\Tasks\', which are common locations for scheduled task definitions.
Detects the creation of scheduled tasks using `schtasks.exe` that are configured to run once at exactly 00:00 and execute suspicious commands or scripts. The suspicious commands include common scripting engines (wscript, cscript, powershell), WMI, regsvr32, or executables located in the AppData directory. This pattern is often used by adversaries for persistence or execution at a specific, often stealthy, time.
Detects the creation of scheduled tasks by user accounts using the 'schtasks.exe' utility. This rule specifically looks for the execution of 'schtasks.exe' with the '/create' command-line argument, while filtering out activity from common system users to reduce false positives.
Detects suspicious scheduled task creation events. Based on attributes such as paths, commands line flags, etc.
This YARA rule detects the Lorenz ransomware by identifying specific byte patterns associated with its file encryption routines, file discovery mechanisms, scheduled task creation for persistence, and remote connection functionalities. The rule includes two main versions of the ransomware's code, covering different implementations of these malicious activities.
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