Sigma Rules
3,132 rules found for "sigma"
Suspicious Reg Add BitLocker
Detects suspicious addition to BitLocker related registry keys via the reg.exe utility
Dropping Of Password Filter DLL
Detects dropping of dll files in system32 that may be used to retrieve user credentials from LSASS
Suspicious Windows Defender Folder Exclusion Added Via Reg.EXE
Detects the usage of "reg.exe" to add Defender folder exclusions. Qbot has been seen using this technique to add exclusions for folders within AppData and ProgramData.
RunMRU Registry Key Deletion
Detects deletion of the RunMRU registry key, which stores the history of commands executed via the Run dialog. In the clickfix techniques, the phishing lures instruct users to open a run dialog through (Win + R) and execute malicious commands. Adversaries may delete this key to cover their tracks after executing commands.
SafeBoot Registry Key Deleted Via Reg.EXE
Detects execution of "reg.exe" commands with the "delete" flag on safe boot registry keys. Often used by attacker to prevent safeboot execution of security products
Service Registry Key Deleted Via Reg.EXE
Detects execution of "reg.exe" commands with the "delete" flag on services registry key. Often used by attacker to remove AV software services
Potentially Suspicious Desktop Background Change Using Reg.EXE
Detects the execution of "reg.exe" to alter registry keys that would replace the user's desktop background. This is a common technique used by malware to change the desktop background to a ransom note or other image.
Direct Autorun Keys Modification
Detects direct modification of autostart extensibility point (ASEP) in registry using reg.exe.
Disabling Windows Defender WMI Autologger Session via Reg.exe
Detects the use of reg.exe to disable the Event Tracing for Windows (ETW) Autologger session for Windows Defender API and Audit events. By setting the 'Start' value to '0' for the 'DefenderApiLogger' or 'DefenderAuditLogger' session, an attacker can prevent these critical security events from being logged, effectively blinding monitoring tools that rely on this data. This is a powerful defense evasion technique.
Security Service Disabled Via Reg.EXE
Detects execution of "reg.exe" to disable security services such as Windows Defender.
Dumping of Sensitive Hives Via Reg.EXE
Detects the usage of "reg.exe" in order to dump sensitive registry hives. This includes SAM, SYSTEM and SECURITY hives.
Windows Recall Feature Enabled Via Reg.EXE
Detects the enabling of the Windows Recall feature via registry manipulation. Windows Recall can be enabled by deleting the existing "DisableAIDataAnalysis" value, or setting it to 0. Adversaries may enable Windows Recall as part of post-exploitation discovery and collection activities. This rule assumes that Recall is already explicitly disabled on the host, and subsequently enabled by the adversary.
Enumeration for Credentials in Registry
Adversaries may search the Registry on compromised systems for insecurely stored credentials. The Windows Registry stores configuration information that can be used by the system or other programs. Adversaries may query the Registry looking for credentials and passwords that have been stored for use by other programs or services
Potential Suspicious Registry File Imported Via Reg.EXE
Detects the import of '.reg' files from suspicious paths using the 'reg.exe' utility
RestrictedAdminMode Registry Value Tampering - ProcCreation
Detects changes to the "DisableRestrictedAdmin" registry value in order to disable or enable RestrictedAdmin mode. RestrictedAdmin mode prevents the transmission of reusable credentials to the remote system to which you connect using Remote Desktop. This prevents your credentials from being harvested during the initial connection process if the remote server has been compromise
Suspicious Query of MachineGUID
Use of reg to get MachineGuid information
Modify Group Policy Settings
Detect malicious GPO modifications can be used to implement many other malicious behaviors.
Enable LM Hash Storage - ProcCreation
Detects changes to the "NoLMHash" registry value in order to allow Windows to store LM Hashes. By setting this registry value to "0" (DWORD), Windows will be allowed to store a LAN manager hash of your password in Active Directory and local SAM databases.
Potential Configuration And Service Reconnaissance Via Reg.EXE
Detects the usage of "reg.exe" in order to query reconnaissance information from the registry. Adversaries may interact with the Windows registry to gather information about credentials, the system, configuration, and installed software.
Potential Tampering With RDP Related Registry Keys Via Reg.EXE
Detects the execution of "reg.exe" for enabling/disabling the RDP service on the host by tampering with the 'CurrentControlSet\Control\Terminal Server' values
Suspicious ScreenSave Change by Reg.exe
Adversaries may establish persistence by executing malicious content triggered by user inactivity. Screensavers are programs that execute after a configurable time of user inactivity and consist of Portable Executable (PE) files with a .scr file extension
Changing Existing Service ImagePath Value Via Reg.EXE
Adversaries may execute their own malicious payloads by hijacking the Registry entries used by services. Adversaries may use flaws in the permissions for registry to redirect from the originally specified executable to one that they control, in order to launch their own code at Service start. Windows stores local service configuration information in the Registry under HKLM\SYSTEM\CurrentControlSet\Services
Detected Windows Software Discovery
Adversaries may attempt to enumerate software for a variety of reasons, such as figuring out what security measures are present or if the compromised system has a version of software that is vulnerable.
Reg Add Suspicious Paths
Detects when an adversary uses the reg.exe utility to add or modify new keys or subkeys
System Language Discovery via Reg.Exe
Detects the usage of Reg.Exe to query system language settings. Attackers may discover the system language to determine the geographic location of victims, customize payloads for specific regions, or avoid targeting certain locales to evade detection.
System Restore Registry Modification via CommandLine
Detects system restore registry modification via command line, which can be used by adversaries to disable system restore on the computer.
Disabled Volume Snapshots
Detects commands that temporarily turn off Volume Snapshots
Suspicious Windows Defender Registry Key Tampering Via Reg.EXE
Detects the usage of "reg.exe" to tamper with different Windows Defender registry keys in order to disable some important features related to protection and detection
Write Protect For Storage Disabled
Detects applications trying to modify the registry in order to disable any write-protect property for storage devices. This could be a precursor to a ransomware attack and has been an observed technique used by cypherpunk group.
Remote Access Tool - AnyDesk Execution
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)
Remote Access Tool - AnyDesk Piped Password Via CLI
Detects piping the password to an anydesk instance via CMD and the '--set-password' flag.
Remote Access Tool - AnyDesk Execution With Known Revoked Signing Certificate
Detects the execution of an AnyDesk binary with a version prior to 8.0.8. Prior to version 8.0.8, the Anydesk application used a signing certificate that got compromised by threat actors. Use this rule to detect instances of older versions of Anydesk using the compromised certificate This is recommended in order to avoid attackers leveraging the certificate and signing their binaries to bypass detections.
Remote Access Tool - AnyDesk Silent Installation
Detects AnyDesk Remote Desktop silent installation. Which can be used by attackers to gain remote access.
Remote Access Tool - Anydesk Execution From Suspicious Folder
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)
Remote Access Tool - GoToAssist Execution
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)
Remote Access Tool - LogMeIn Execution
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)
Remote Access Tool - Potential MeshAgent Execution - Windows
Detects potential execution of MeshAgent which is a tool used for remote access. Historical data shows that threat actors rename MeshAgent binary to evade detection. Matching command lines with the '--meshServiceName' argument can indicate that the MeshAgent is being used for remote access.
Remote Access Tool - MeshAgent Command Execution via MeshCentral
Detects the use of MeshAgent to execute commands on the target host, particularly when threat actors might abuse it to execute commands directly. MeshAgent can execute commands on the target host by leveraging win-console to obscure their activities and win-dispatcher to run malicious code through IPC with child processes.
Remote Access Tool - NetSupport Execution
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)
Remote Access Tool - NetSupport Execution From Unusual Location
Detects execution of client32.exe (NetSupport RAT) from an unusual location (outside of 'C:\Program Files')
Remote Access Tool - Renamed MeshAgent Execution - Windows
Detects the execution of a renamed instance of the Remote Monitoring and Management (RMM) tool, MeshAgent. RMM tools such as MeshAgent are commonly utilized by IT administrators for legitimate remote support and system management. However, malicious actors may exploit these tools by renaming them to bypass detection mechanisms, enabling unauthorized access and control over compromised systems.
Remote Access Tool - RURAT Execution From Unusual Location
Detects execution of Remote Utilities RAT (RURAT) from an unusual location (outside of 'C:\Program Files')
Remote Access Tool - ScreenConnect Execution
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)
Remote Access Tool - ScreenConnect Installation Execution
Detects ScreenConnect program starts that establish a remote access to a system.
Remote Access Tool - ScreenConnect Remote Command Execution
Detects the execution of a system command via the ScreenConnect RMM service.
Remote Access Tool - ScreenConnect Potential Suspicious Remote Command Execution
Detects potentially suspicious child processes launched via the ScreenConnect client service.
Remote Access Tool - ScreenConnect Server Web Shell Execution
Detects potential web shell execution from the ScreenConnect server process.
Remote Access Tool - Simple Help Execution
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)