Sigma Rules
1,398 rules found
Bypass UAC via WSReset.exe
Detects use of WSReset.exe to bypass User Account Control (UAC). Adversaries use this technique to execute privileged processes.
UAC Bypass WSReset
Detects the pattern of UAC Bypass via WSReset usable by default sysmon-config
Use of UltraVNC Remote Access Software
An adversary may use legitimate desktop support and remote access software,to establish an interactive command and control channel to target systems within networks
Suspicious UltraVNC Execution
Detects suspicious UltraVNC command line flag combination that indicate a auto reconnect upon execution, e.g. startup (as seen being used by Gamaredon threat group)
Uninstall Crowdstrike Falcon Sensor
Adversaries may disable security tools to avoid possible detection of their tools and activities by uninstalling Crowdstrike Falcon
User Shell Folders Registry Modification via CommandLine
Detects modifications to User Shell Folders registry values via reg.exe or PowerShell, which could indicate persistence attempts. Attackers may modify User Shell Folders registry values to point to malicious executables or scripts that will be executed during startup. This technique is often used to maintain persistence on a compromised system by ensuring that malicious payloads are executed automatically.
Uncommon Userinit Child Process
Detects uncommon "userinit.exe" child processes, which could be a sign of uncommon shells or login scripts used for persistence.
Windows Credential Manager Access via VaultCmd
List credentials currently stored in Windows Credential Manager via the native Windows utility vaultcmd.exe
Registry Modification Attempt Via VBScript
Detects attempts to modify the registry using VBScript's CreateObject("Wscript.shell") and RegWrite methods via common LOLBINs. It could be an attempt to modify the registry for persistence without using straightforward methods like regedit.exe, reg.exe, or PowerShell. Threat Actors may use this technique to evade detection by security solutions that monitor for direct registry modifications through traditional tools.
Verclsid.exe Runs COM Object
Detects when verclsid.exe is used to run COM object via GUID
Virtualbox Driver Installation or Starting of VMs
Adversaries can carry out malicious operations using a virtual instance to avoid detection. This rule is built to detect the registration of the Virtualbox driver or start of a Virtualbox VM.
Suspicious VBoxDrvInst.exe Parameters
Detect VBoxDrvInst.exe run with parameters allowing processing INF file. This allows to create values in the registry and install drivers. For example one could use this technique to obtain persistence via modifying one of Run or RunOnce registry keys
Potential Persistence Via VMwareToolBoxCmd.EXE VM State Change Script
Detects execution of the "VMwareToolBoxCmd.exe" with the "script" and "set" flag to setup a specific script to run for a specific VM state
Suspicious Persistence Via VMwareToolBoxCmd.EXE VM State Change Script
Detects execution of the "VMwareToolBoxCmd.exe" with the "script" and "set" flag to setup a specific script that's located in a potentially suspicious location to run for a specific VM state
VMToolsd Suspicious Child Process
Detects suspicious child process creations of VMware Tools process which may indicate persistence setup
Potentially Suspicious Child Process Of VsCode
Detects uncommon or suspicious child processes spawning from a VsCode "code.exe" process. This could indicate an attempt of persistence via VsCode tasks or terminal profiles.
Visual Studio Code Tunnel Execution
Detects Visual Studio Code tunnel execution. Attackers can abuse this functionality to establish a C2 channel
Visual Studio Code Tunnel Shell Execution
Detects the execution of a shell (powershell, bash, wsl...) via Visual Studio Code tunnel. Attackers can abuse this functionality to establish a C2 channel and execute arbitrary commands on the system.
Renamed Visual Studio Code Tunnel Execution
Detects renamed Visual Studio Code tunnel execution. Attackers can abuse this functionality to establish a C2 channel
Visual Studio Code Tunnel Service Installation
Detects the installation of VsCode tunnel (code-tunnel) as a service.
Potential Binary Proxy Execution Via VSDiagnostics.EXE
Detects execution of "VSDiagnostics.exe" with the "start" command in order to launch and proxy arbitrary binaries.
Proxy Execution via Vshadow
Detects the invocation of vshadow.exe with the -exec parameter that executes a specified script or command after the shadow copies are created but before the VShadow tool exits. VShadow is a command-line tool that you can use to create and manage volume shadow copies. While legitimate backup or administrative scripts may use this flag, attackers can leverage this parameter to proxy the execution of malware.
Suspicious Vsls-Agent Command With AgentExtensionPath Load
Detects Microsoft Visual Studio vsls-agent.exe lolbin execution with a suspicious library load using the --agentExtensionPath parameter
Vulnerable Driver Blocklist Registry Tampering Via CommandLine
Detects tampering of the Vulnerable Driver Blocklist registry via command line tools such as PowerShell or REG.EXE. The Vulnerable Driver Blocklist is a security feature that helps prevent the loading of known vulnerable drivers. Disabling this feature may indicate an attempt to bypass security controls, often targeted by threat actors to facilitate the installation of malicious or vulnerable drivers, particularly in scenarios involving Endpoint Detection and Response
Use of W32tm as Timer
When configured with suitable command line arguments, w32tm can act as a delay mechanism
Wab Execution From Non Default Location
Detects execution of wab.exe (Windows Contacts) and Wabmig.exe (Microsoft Address Book Import Tool) from non default locations as seen with bumblebee activity
Wab/Wabmig Unusual Parent Or Child Processes
Detects unusual parent or children of the wab.exe (Windows Contacts) and Wabmig.exe (Microsoft Address Book Import Tool) processes as seen being used with bumblebee activity
All Backups Deleted Via Wbadmin.EXE
Detects the deletion of all backups or system state backups via "wbadmin.exe". This technique is used by numerous ransomware families and actors. This may only be successful on server platforms that have Windows Backup enabled.
Windows Backup Deleted Via Wbadmin.EXE
Detects the deletion of backups or system state backups via "wbadmin.exe". This technique is used by numerous ransomware families and actors. This may only be successful on server platforms that have Windows Backup enabled.
Sensitive File Dump Via Wbadmin.EXE
Detects the dump of highly sensitive files such as "NTDS.DIT" and "SECURITY" hive. Attackers can leverage the "wbadmin" utility in order to dump sensitive files that might contain credential or sensitive information.
File Recovery From Backup Via Wbadmin.EXE
Detects the recovery of files from backups via "wbadmin.exe". Attackers can restore sensitive files such as NTDS.DIT or Registry Hives from backups in order to potentially extract credentials.
Sensitive File Recovery From Backup Via Wbadmin.EXE
Detects the dump of highly sensitive files such as "NTDS.DIT" and "SECURITY" hive. Attackers can leverage the "wbadmin" utility in order to dump sensitive files that might contain credential or sensitive information.
Potentially Suspicious WebDAV LNK Execution
Detects possible execution via LNK file accessed on a WebDAV server.
Chopper Webshell Process Pattern
Detects patterns found in process executions cause by China Chopper like tiny (ASPX) webshells
Webshell Hacking Activity Patterns
Detects certain parent child patterns found in cases in which a web shell is used to perform certain credential dumping or exfiltration activities on a compromised system
Webshell Detection With Command Line Keywords
Detects certain command line parameters often used during reconnaissance activity via web shells
Suspicious Process By Web Server Process
Detects potentially suspicious processes being spawned by a web server process which could be the result of a successfully placed web shell or exploitation
Webshell Tool Reconnaissance Activity
Detects processes spawned from web servers (PHP, Tomcat, IIS, etc.) that perform reconnaissance looking for the existence of popular scripting tools (perl, python, wget) on the system via the help commands
Potential Credential Dumping Via WER
Detects potential credential dumping via Windows Error Reporting LSASS Shtinkering technique which uses the Windows Error Reporting to dump lsass
Potential ReflectDebugger Content Execution Via WerFault.EXE
Detects execution of "WerFault.exe" with the "-pr" commandline flag that is used to run files stored in the ReflectDebugger key which could be used to store the path to the malware in order to masquerade the execution flow
PPL Tampering Via WerFaultSecure
Detects potential abuse of WerFaultSecure.exe to dump Protected Process Light (PPL) processes like LSASS or to freeze security solutions (EDR/antivirus). This technique is used by tools such as EDR-Freeze and WSASS to bypass PPL protections and access sensitive information or disable security software. Distinct command line patterns help identify the specific tool: - WSASS usage typically shows: "WSASS.exe WerFaultSecure.exe [PID]" in ParentCommandLine - EDR-Freeze usage typically shows: "EDR-Freeze_[version].exe [PID] [timeout]" in ParentCommandLine Legitimate debugging operations using WerFaultSecure are rare in production environments and should be investigated.
Suspicious Child Process Of Wermgr.EXE
Detects suspicious Windows Error Reporting manager (wermgr.exe) child process
Suspicious Execution Location Of Wermgr.EXE
Detects suspicious Windows Error Reporting manager (wermgr.exe) execution location.
Suspicious File Download From IP Via Wget.EXE
Detects potentially suspicious file downloads directly from IP addresses using Wget.exe
Suspicious File Download From File Sharing Domain Via Wget.EXE
Detects potentially suspicious file downloads from file sharing domains using wget.exe
Suspicious File Download From IP Via Wget.EXE - Paths
Detects potentially suspicious file downloads directly from IP addresses and stored in suspicious locations using Wget.exe
Suspicious Where Execution
Adversaries may enumerate browser bookmarks to learn more about compromised hosts. Browser bookmarks may reveal personal information about users (ex: banking sites, interests, social media, etc.) as well as details about internal network resources such as servers, tools/dashboards, or other related infrastructure.
Enumerate All Information With Whoami.EXE
Detects the execution of "whoami.exe" with the "/all" flag