Sigma Rules
1,709 rules found
Suspicious Manipulation Of Default Accounts Via Net.EXE
Detects suspicious manipulations of default accounts such as 'administrator' and 'guest'. For example 'enable' or 'disable' accounts or change the password...etc
Windows Internet Hosted WebDav Share Mount Via Net.EXE
Detects when an internet hosted webdav share is mounted using the "net.exe" utility
Potential Arbitrary Code Execution Via Node.EXE
Detects the execution node.exe which is shipped with multiple software such as VMware, Adobe...etc. In order to execute arbitrary code. For example to establish reverse shell as seen in Log4j attacks...etc
Network Reconnaissance Activity
Detects a set of suspicious network related commands often used in recon stages
Suspicious Driver/DLL Installation Via Odbcconf.EXE
Detects execution of "odbcconf" with the "INSTALLDRIVER" action where the driver doesn't contain a ".dll" extension. This is often used as a defense evasion method.
Odbcconf.EXE Suspicious DLL Location
Detects execution of "odbcconf" where the path of the DLL being registered is located in a potentially suspicious location.
Potentially Suspicious DLL Registered Via Odbcconf.EXE
Detects execution of "odbcconf" with the "REGSVR" action where the DLL in question doesn't contain a ".dll" extension. Which is often used as a method to evade defenses.
Suspicious Response File Execution Via Odbcconf.EXE
Detects execution of "odbcconf" with the "-f" flag in order to load a response file with a non-".rsp" extension.
Potential Arbitrary File Download Using Office Application
Detects potential arbitrary file download using a Microsoft Office application
Potential Excel.EXE DCOM Lateral Movement Via ActivateMicrosoftApp
Detects suspicious child processes of Excel which could be an indicator of lateral movement leveraging the "ActivateMicrosoftApp" Excel DCOM object.
Potentially Suspicious Office Document Executed From Trusted Location
Detects the execution of an Office application that points to a document that is located in a trusted location. Attackers often used this to avoid macro security and execute their malicious code.
OneNote.EXE Execution of Malicious Embedded Scripts
Detects the execution of malicious OneNote documents that contain embedded scripts. When a user clicks on a OneNote attachment and then on the malicious link inside the ".one" file, it exports and executes the malicious embedded script from specific directories.
Suspicious Microsoft OneNote Child Process
Detects suspicious child processes of the Microsoft OneNote application. This may indicate an attempt to execute malicious embedded objects from a .one file.
Outlook EnableUnsafeClientMailRules Setting Enabled
Detects an attacker trying to enable the outlook security setting "EnableUnsafeClientMailRules" which allows outlook to run applications or execute macros
Suspicious Execution From Outlook Temporary Folder
Detects a suspicious program execution in Outlook temp folder
Suspicious Outlook Child Process
Detects a suspicious process spawning from an Outlook process.
Suspicious Remote Child Process From Outlook
Detects a suspicious child process spawning from Outlook where the image is located in a remote location (SMB/WebDav shares).
Suspicious Binary In User Directory Spawned From Office Application
Detects an executable in the users directory started from one of the Microsoft Office suite applications (Word, Excel, PowerPoint, Publisher, Visio)
Suspicious Microsoft Office Child Process
Detects a suspicious process spawning from one of the Microsoft Office suite products (Word, Excel, PowerPoint, Publisher, Visio, etc.)
Ping Hex IP
Detects a ping command that uses a hex encoded IP address
Suspicious Plink Port Forwarding
Detects suspicious Plink tunnel port forwarding to a local port
Potential RDP Tunneling Via Plink
Execution of plink to perform data exfiltration and tunneling
AADInternals PowerShell Cmdlets Execution - ProccessCreation
Detects ADDInternals Cmdlet execution. A tool for administering Azure AD and Office 365. Which can be abused by threat actors to attack Azure AD or Office 365.
Potential AMSI Bypass Via .NET Reflection
Detects Request to "amsiInitFailed" that can be used to disable AMSI Scanning
Suspicious Encoded PowerShell Command Line
Detects suspicious powershell process starts with base64 encoded commands (e.g. Emotet)
Suspicious PowerShell Encoded Command Patterns
Detects PowerShell command line patterns in combincation with encoded commands that often appear in malware infection chains
Suspicious Obfuscated PowerShell Code
Detects suspicious UTF16 and base64 encoded and often obfuscated PowerShell code often used in command lines
PowerShell Base64 Encoded FromBase64String Cmdlet
Detects usage of a base64 encoded "FromBase64String" cmdlet in a process command line
Malicious Base64 Encoded PowerShell Keywords in Command Lines
Detects base64 encoded strings used in hidden malicious PowerShell command lines
PowerShell Base64 Encoded IEX Cmdlet
Detects usage of a base64 encoded "IEX" cmdlet in a process command line
PowerShell Base64 Encoded Invoke Keyword
Detects UTF-8 and UTF-16 Base64 encoded powershell 'Invoke-' calls
Powershell Base64 Encoded MpPreference Cmdlet
Detects base64 encoded "MpPreference" PowerShell cmdlet code that tries to modifies or tamper with Windows Defender AV
PowerShell Base64 Encoded Reflective Assembly Load
Detects base64 encoded .NET reflective loading of Assembly
Suspicious Encoded And Obfuscated Reflection Assembly Load Function Call
Detects suspicious base64 encoded and obfuscated "LOAD" keyword used in .NET "reflection.assembly"
PowerShell Base64 Encoded WMI Classes
Detects calls to base64 encoded WMI class such as "Win32_ShadowCopy", "Win32_ScheduledJob", etc.
Potential PowerShell Obfuscation Via Reversed Commands
Detects the presence of reversed PowerShell commands in the CommandLine. This is often used as a method of obfuscation by attackers
Potential PowerShell Command Line Obfuscation
Detects the PowerShell command lines with special characters
Obfuscated PowerShell MSI Install via WindowsInstaller COM
Detects the execution of obfuscated PowerShell commands that attempt to install MSI packages via the Windows Installer COM object (`WindowsInstaller.Installer`). The technique involves manipulating strings to hide functionality, such as constructing class names using string insertion (e.g., 'indowsInstaller.Installer'.Insert(0,'W')) and correcting malformed URLs (e.g., converting 'htps://' to 'https://') at runtime. This behavior is commonly associated with malware loaders or droppers that aim to bypass static detection by hiding intent in runtime-generated strings and using legitimate tools for code execution. The use of `InstallProduct` and COM object creation, particularly combined with hidden window execution and suppressed UI, indicates an attempt to install software (likely malicious) without user interaction.
PowerShell Execution With Potential Decryption Capabilities
Detects PowerShell commands that decrypt an ".LNK" "file to drop the next stage of the malware.
Powershell Defender Disable Scan Feature
Detects requests to disable Microsoft Defender features using PowerShell commands
Disable Windows Defender AV Security Monitoring
Detects attackers attempting to disable Windows Defender using Powershell
Disabled IE Security Features
Detects command lines that indicate unwanted modifications to registry keys that disable important Internet Explorer security features
Obfuscated PowerShell OneLiner Execution
Detects the execution of a specific OneLiner to download and execute powershell modules in memory.
PowerShell Download and Execution Cradles
Detects PowerShell download and execution cradles.
Potentially Suspicious File Download From File Sharing Domain Via PowerShell.EXE
Detects potentially suspicious file downloads from file sharing domains using PowerShell.exe
DSInternals Suspicious PowerShell Cmdlets
Detects execution and usage of the DSInternals PowerShell module. Which can be used to perform what might be considered as suspicious activity such as dumping DPAPI backup keys or manipulating NTDS.DIT files. The DSInternals PowerShell Module exposes several internal features of Active Directory and Azure Active Directory. These include FIDO2 and NGC key auditing, offline ntds.dit file manipulation, password auditing, DC recovery from IFM backups and password hash calculation.
Email Exifiltration Via Powershell
Detects email exfiltration via powershell cmdlets
Base64 Encoded PowerShell Command Detected
Detects usage of the "FromBase64String" function in the commandline which is used to decode a base64 encoded string