Sigma Rules
3,116 rules found
Suspicious Rundll32 Activity Invoking Sys File
Detects suspicious process related to rundll32 based on command line that includes a *.sys file as seen being used by UNC2452
Potentially Suspicious Rundll32.EXE Execution of UDL File
Detects the execution of rundll32.exe with the oledb32.dll library to open a UDL file. Threat actors can abuse this technique as a phishing vector to capture authentication credentials or other sensitive data.
Rundll32 UNC Path Execution
Detects rundll32 execution where the DLL is located on a remote location (share)
Rundll32 Execution With Uncommon DLL Extension
Detects the execution of rundll32 with a command line that doesn't contain a common extension
Suspicious Workstation Locking via Rundll32
Detects a suspicious call to the user32.dll function that locks the user workstation
WebDav Client Execution Via Rundll32.EXE
Detects "svchost.exe" spawning "rundll32.exe" with command arguments like "C:\windows\system32\davclnt.dll,DavSetCookie". This could be an indicator of exfiltration or use of WebDav to launch code (hosted on a WebDav server).
Suspicious WebDav Client Execution Via Rundll32.EXE
Detects "svchost.exe" spawning "rundll32.exe" with command arguments like C:\windows\system32\davclnt.dll,DavSetCookie. This could be an indicator of exfiltration or use of WebDav to launch code (hosted on WebDav Server) or potentially a sign of exploitation of CVE-2023-23397
Rundll32 Execution Without Parameters
Detects rundll32 execution without parameters as observed when running Metasploit windows/smb/psexec exploit module
Run Once Task Execution as Configured in Registry
This rule detects the execution of Run Once task as configured in the registry
Possible Privilege Escalation via Weak Service Permissions
Detection of sc.exe utility spawning by user with Medium integrity level to change service ImagePath or FailureCommand
New Service Creation Using Sc.EXE
Detects the creation of a new service using the "sc.exe" utility.
Service StartupType Change Via Sc.EXE
Detect the use of "sc.exe" to change the startup type of a service to "disabled" or "demand"
New Kernel Driver Via SC.EXE
Detects creation of a new service (kernel driver) with the type "kernel"
Interesting Service Enumeration Via Sc.EXE
Detects the enumeration and query of interesting and in some cases sensitive services on the system via "sc.exe". Attackers often try to enumerate the services currently running on a system in order to find different attack vectors.
Allow Service Access Using Security Descriptor Tampering Via Sc.EXE
Detects suspicious DACL modifications to allow access to a service from a suspicious trustee. This can be used to override access restrictions set by previous ACLs.
Deny Service Access Using Security Descriptor Tampering Via Sc.EXE
Detects suspicious DACL modifications to deny access to a service that affects critical trustees. This can be used to hide services or make them unstoppable.
Service DACL Abuse To Hide Services Via Sc.EXE
Detects usage of the "sc.exe" utility adding a new service with special permission seen used by threat actors which makes the service hidden and unremovable.
Service Security Descriptor Tampering Via Sc.EXE
Detection of sc.exe utility adding a new service with special permission which hides that service.
Suspicious Service Path Modification
Detects service path modification via the "sc" binary to a suspicious command or path
Potential Persistence Attempt Via Existing Service Tampering
Detects the modification of an existing service in order to execute an arbitrary payload when the service is started or killed as a potential method for persistence.
Stop Windows Service Via Sc.EXE
Detects the stopping of a Windows service via the "sc.exe" utility
Suspicious Schtasks Execution AppData Folder
Detects the creation of a schtask that executes a file from C:\Users\<USER>\AppData\Local
Suspicious Modification Of Scheduled Tasks
Detects when an attacker tries to modify an already existing scheduled tasks to run from a suspicious location Attackers can create a simple looking task in order to avoid detection on creation as it's often the most focused on Instead they modify the task after creation to include their malicious payload
Scheduled Task Creation Via Schtasks.EXE
Detects the creation of scheduled tasks by user accounts via the "schtasks" utility.
Suspicious Scheduled Task Creation Involving Temp Folder
Detects the creation of scheduled tasks that involves a temporary folder and runs only once
Scheduled Task Creation with Curl and PowerShell Execution Combo
Detects the creation of a scheduled task using schtasks.exe, potentially in combination with curl for downloading payloads and PowerShell for executing them. This facilitates executing malicious payloads or connecting with C&C server persistently without dropping the malware sample on the host.
Delete Important Scheduled Task
Detects when adversaries stop services or processes by deleting their respective scheduled tasks in order to conduct data destructive activities
Delete All Scheduled Tasks
Detects the usage of schtasks with the delete flag and the asterisk symbol to delete all tasks from the schedule of the local computer, including tasks scheduled by other users.
Disable Important Scheduled Task
Detects when adversaries stop services or processes by disabling their respective scheduled tasks in order to conduct data destructive activities
Schedule Task Creation From Env Variable Or Potentially Suspicious Path Via Schtasks.EXE
Detects Schtask creations that point to a suspicious folder or an environment variable often used by malware
Schtasks From Suspicious Folders
Detects scheduled task creations that have suspicious action command and folder combinations
Suspicious Scheduled Task Name As GUID
Detects creation of a scheduled task with a GUID like name
Uncommon One Time Only Scheduled Task At 00:00
Detects scheduled task creation events that include suspicious actions, and is run once at 00:00
Potential SSH Tunnel Persistence Install Using A Scheduled Task
Detects the creation of new scheduled tasks via commandline, using Schtasks.exe. This rule detects tasks creating that call OpenSSH, which may indicate the creation of reverse SSH tunnel to the attacker's server.
Potential Persistence Via Microsoft Compatibility Appraiser
Detects manual execution of the "Microsoft Compatibility Appraiser" task via schtasks. In order to trigger persistence stored in the "\AppCompatFlags\TelemetryController" registry key.
Potential Persistence Via Powershell Search Order Hijacking - Task
Detects suspicious powershell execution via a schedule task where the command ends with an suspicious flags to hide the powershell instance instead of executeing scripts or commands. This could be a sign of persistence via PowerShell "Get-Variable" technique as seen being used in Colibri Loader
Scheduled Task Executing Payload from Registry
Detects the creation of a schtasks that potentially executes a payload stored in the Windows Registry using PowerShell.
Scheduled Task Executing Encoded Payload from Registry
Detects the creation of a schtask that potentially executes a base64 encoded payload stored in the Windows Registry using PowerShell.
Suspicious Schtasks Schedule Types
Detects scheduled task creations or modification on a suspicious schedule type
Suspicious Schtasks Schedule Type With High Privileges
Detects scheduled task creations or modification to be run with high privileges on a suspicious schedule type
Suspicious Scheduled Task Creation via Masqueraded XML File
Detects the creation of a scheduled task using the "-XML" flag with a file without the '.xml' extension. This behavior could be indicative of potential defense evasion attempt during persistence
Suspicious Command Patterns In Scheduled Task Creation
Detects scheduled task creation using "schtasks" that contain potentially suspicious or uncommon commands
Schtasks Creation Or Modification With SYSTEM Privileges
Detects the creation or update of a scheduled task to run with "NT AUTHORITY\SYSTEM" privileges
Scheduled Task Creation Masquerading as System Processes
Detects the creation of scheduled tasks that involve system processes, which may indicate malicious actors masquerading as or abusing these processes to execute payloads or maintain persistence.
Script Event Consumer Spawning Process
Detects a suspicious child process of Script Event Consumer (scrcons.exe).
Potential Shim Database Persistence via Sdbinst.EXE
Detects installation of a new shim using sdbinst.exe. Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by application shims
Uncommon Extension Shim Database Installation Via Sdbinst.EXE
Detects installation of a potentially suspicious new shim with an uncommon extension using sdbinst.exe. Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by application shims
Sdclt Child Processes
A General detection for sdclt spawning new processes. This could be an indicator of sdclt being used for bypass UAC techniques.