Sigma Rules
3,132 rules found for "sigma"
Potential Obfuscated Ordinal Call Via Rundll32
Detects execution of "rundll32" with potential obfuscated ordinal calls
Rundll32 Spawned Via Explorer.EXE
Detects execution of "rundll32.exe" with a parent process of Explorer.exe. This has been observed by variants of Raspberry Robin, as first reported by Red Canary.
Process Memory Dump Via Comsvcs.DLL
Detects a process memory dump via "comsvcs.dll" using rundll32, covering multiple different techniques (ordinal, minidump function, etc.)
Rundll32 Registered COM Objects
load malicious registered COM objects
Suspicious Process Start Locations
Detects suspicious process run from unusual locations
Suspicious Rundll32 Setupapi.dll Activity
setupapi.dll library provide InstallHinfSection function for processing INF files. INF file may contain instructions allowing to create values in the registry, modify files and install drivers. This technique could be used to obtain persistence via modifying one of Run or RunOnce registry keys, run process or use other DLLs chain calls (see references) InstallHinfSection function in setupapi.dll calls runonce.exe executable regardless of actual content of INF file.
Shell32 DLL Execution in Suspicious Directory
Detects shell32.dll executing a DLL in a suspicious directory
Potential ShellDispatch.DLL Functionality Abuse
Detects potential "ShellDispatch.dll" functionality abuse to execute arbitrary binaries via "ShellExecute"
RunDLL32 Spawning Explorer
Detects RunDLL32.exe spawning explorer.exe as child, which is very uncommon, often observes Gamarue spawning the explorer.exe process in an unusual way
Potentially Suspicious Rundll32 Activity
Detects suspicious execution of rundll32, with specific calls to some DLLs with known LOLBIN functionalities
Suspicious Control Panel DLL Load
Detects suspicious Rundll32 execution from control.exe as used by Equation Group and Exploit Kits
Suspicious Rundll32 Execution With Image Extension
Detects the execution of Rundll32.exe with DLL files masquerading as image files
Suspicious Usage Of ShellExec_RunDLL
Detects suspicious usage of the ShellExec_RunDLL function to launch other commands as seen in the the raspberry-robin attack
Suspicious ShellExec_RunDLL Call Via Ordinal
Detects suspicious call to the "ShellExec_RunDLL" exported function of SHELL32.DLL through the ordinal number to launch other commands. Adversary might only use the ordinal number in order to bypass existing detection that alert on usage of ShellExec_RunDLL on CommandLine.
ShimCache Flush
Detects actions that clear the local ShimCache and remove forensic evidence
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 Execution With Uncommon DLL Extension
Detects the execution of rundll32 with a command line that doesn't contain a common extension
Rundll32 UNC Path Execution
Detects rundll32 execution where the DLL is located on a remote location (share)
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
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).