Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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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 when important scheduled tasks are deleted or disabled. Adversaries may delete or disable scheduled tasks to hinder defensive capabilities, stop legitimate services, or prevent forensic analysis. This rule specifically targets tasks related to system restore, Windows Defender, BitLocker, Windows Backup, and Windows Update, which are critical for system integrity and security.
This rule detects potentially suspicious child processes spawned by PowerShell. It specifically looks for PowerShell (powershell.exe, powershell_ise.exe, pwsh.exe) launching a set of common Windows utilities that can be abused for malicious purposes, such as 'bitsadmin.exe', 'certutil.exe', 'mshta.exe', 'regsvr32.exe', 'rundll32.exe', 'schtasks.exe', and 'wmic.exe'. The rule includes filters to reduce false positives, such as specific command lines for AWS Workspaces, certutil's '-verifystore' option, and common benign wmic queries.
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 when adversaries delete important scheduled tasks using `schtasks.exe` to disrupt system functionality or security mechanisms. The rule specifically targets the deletion of tasks related to critical Windows components like BitLocker, ExploitGuard, SystemRestore, UpdateOrchestrator, Windows Defender, WindowsBackup, and WindowsUpdate, which can indicate an attempt to disable or interfere with essential system services or security features.
This rule detects the deletion of the 'SD' (Security Descriptor) value within the `\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\` registry hive. This action is typically performed by adversaries to hide scheduled tasks, making them less visible to standard enumeration tools. This technique has been observed in use by the Tarrask malware.
Detects when the "Index" value of a scheduled task is modified in the registry to "DWORD (0x00000000)". This modification effectively hides the scheduled task from standard tooling like "schtasks /query", making it harder for defenders to discover.
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 when the "Index" value of a scheduled task is removed or deleted from the Windows Registry. This action effectively hides the scheduled task from standard tooling like "schtasks /query", making it a defense evasion technique.
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 the creation of a schtask via PowerSploit or Empire Default Configuration.
Detects suspicious scheduled task creation events. Based on attributes such as paths, commands line flags, etc.
Detects update to a scheduled task event that contain suspicious keywords.
Detects scheduled task creation events that include suspicious actions, and is run once at 00:00
Detects scheduled task creation using "schtasks" that contain potentially suspicious or uncommon commands
Detects the creation of a schtask that potentially executes a base64 encoded payload stored in the Windows Registry using PowerShell.
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.
Yara rule that detects Lorenz ransomware.
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