Sigma Rules
3,707 rules found for "sigma"
DPAPI Domain Master Key Backup Attempt
Detects anyone attempting a backup for the DPAPI Master Key. This events gets generated at the source and not the Domain Controller.
External Disk Drive Or USB Storage Device Was Recognized By The System
Detects external disk drives or plugged-in USB devices.
Persistence and Execution at Scale via GPO Scheduled Task
Detect lateral movement using GPO scheduled task, usually used to deploy ransomware at scale
Hidden Local User Creation
Detects the creation of a local hidden user account which should not happen for event ID 4720.
HackTool - EDRSilencer Execution - Filter Added
Detects execution of EDRSilencer, a tool that abuses the Windows Filtering Platform (WFP) to block the outbound traffic of running EDR agents based on specific hardcoded filter names.
HackTool - NoFilter Execution
Detects execution of NoFilter, a tool for abusing the Windows Filtering Platform for privilege escalation via hardcoded policy name indicators
HybridConnectionManager Service Installation
Rule to detect the Hybrid Connection Manager service installation.
Impacket PsExec Execution
Detects execution of Impacket's psexec.py.
Possible Impacket SecretDump Remote Activity
Detect AD credential dumping using impacket secretdump HKTL
Invoke-Obfuscation CLIP+ Launcher - Security
Detects Obfuscated use of Clip.exe to execute PowerShell
Invoke-Obfuscation Obfuscated IEX Invocation - Security
Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework from the code block linked in the references
Invoke-Obfuscation STDIN+ Launcher - Security
Detects Obfuscated use of stdin to execute PowerShell
Invoke-Obfuscation VAR+ Launcher - Security
Detects Obfuscated use of Environment Variables to execute PowerShell
Invoke-Obfuscation COMPRESS OBFUSCATION - Security
Detects Obfuscated Powershell via COMPRESS OBFUSCATION
Invoke-Obfuscation RUNDLL LAUNCHER - Security
Detects Obfuscated Powershell via RUNDLL LAUNCHER
Invoke-Obfuscation Via Stdin - Security
Detects Obfuscated Powershell via Stdin in Scripts
Invoke-Obfuscation Via Use Clip - Security
Detects Obfuscated Powershell via use Clip.exe in Scripts
Invoke-Obfuscation Via Use MSHTA - Security
Detects Obfuscated Powershell via use MSHTA in Scripts
Invoke-Obfuscation Via Use Rundll32 - Security
Detects Obfuscated Powershell via use Rundll32 in Scripts
Invoke-Obfuscation VAR++ LAUNCHER OBFUSCATION - Security
Detects Obfuscated Powershell via VAR++ LAUNCHER
ISO Image Mounted
Detects the mount of an ISO image on an endpoint
Kerberoasting Activity - Initial Query
This rule will collect the data needed to start looking into possible kerberoasting activity. Further analysis or computation within the query is needed focusing on requests from one specific host/IP towards multiple service names within a time period of 5 seconds. You can then set a threshold for the number of requests and time between the requests to turn this into an alert.
Potential AS-REP Roasting via Kerberos TGT Requests
Detects suspicious Kerberos TGT requests with pre-authentication disabled (Pre-Authentication Type = 0) and Ticket Encryption Type (0x17) i.e, RC4-HMAC. This may indicate an AS-REP Roasting attack, where attackers request AS-REP messages for accounts without pre-authentication and attempt to crack the encrypted ticket offline to recover user passwords.
Potential Kerberos Coercion by Spoofing SPNs via DNS Manipulation
Detects modifications to DNS records in Active Directory where the Distinguished Name (DN) contains a base64-encoded blob matching the pattern "1UWhRCAAAAA...BAAAA". This pattern corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure, commonly used in Kerberos coercion attacks. Adversaries may exploit this to coerce victim systems into authenticating to attacker-controlled hosts by spoofing SPNs via DNS. It is one of the strong indicators of a Kerberos coercion attack,. where adversaries manipulate DNS records to spoof Service Principal Names (SPNs) and redirect authentication requests like CVE-2025-33073. Please investigate the user account that made the changes, as it is likely a low-privileged account that has been compromised.
First Time Seen Remote Named Pipe
This detection excludes known namped pipes accessible remotely and notify on newly observed ones, may help to detect lateral movement and remote exec using named pipes
LSASS Access From Non System Account
Detects potential mimikatz-like tools accessing LSASS from non system account
Credential Dumping Tools Service Execution - Security
Detects well-known credential dumping tools execution via service execution events
WCE wceaux.dll Access
Detects wceaux.dll access while WCE pass-the-hash remote command execution on source host
Metasploit SMB Authentication
Alerts on Metasploit host's authentications on the domain.
Metasploit Or Impacket Service Installation Via SMB PsExec
Detects usage of Metasploit SMB PsExec (exploit/windows/smb/psexec) and Impacket psexec.py by triggering on specific service installation
Meterpreter or Cobalt Strike Getsystem Service Installation - Security
Detects the use of getsystem Meterpreter/Cobalt Strike command by detecting a specific service installation
NetNTLM Downgrade Attack
Detects NetNTLM downgrade attack
Windows Network Access Suspicious desktop.ini Action
Detects unusual processes accessing desktop.ini remotely over network share, which can be leveraged to alter how Explorer displays a folder's content (i.e. renaming files) without changing them on disk.
New or Renamed User Account with '$' Character
Detects the creation of a user with the "$" character. This can be used by attackers to hide a user or trick detection systems that lack the parsing mechanisms.
Denied Access To Remote Desktop
This event is generated when an authenticated user who is not allowed to log on remotely attempts to connect to this computer through Remote Desktop. Often, this event can be generated by attackers when searching for available windows servers in the network.
Password Policy Enumerated
Detects when the password policy is enumerated.
Windows Pcap Drivers
Detects Windows Pcap driver installation based on a list of associated .sys files.
Possible PetitPotam Coerce Authentication Attempt
Detect PetitPotam coerced authentication activity.
PetitPotam Suspicious Kerberos TGT Request
Detect suspicious Kerberos TGT requests. Once an attacer obtains a computer certificate by abusing Active Directory Certificate Services in combination with PetitPotam, the next step would be to leverage the certificate for malicious purposes. One way of doing this is to request a Kerberos Ticket Granting Ticket using a tool like Rubeus. This request will generate a 4768 event with some unusual fields depending on the environment. This analytic will require tuning, we recommend filtering Account_Name to the Domain Controller computer accounts.
Possible DC Shadow Attack
Detects DCShadow via create new SPN
PowerShell Scripts Installed as Services - Security
Detects powershell script installed as a Service
Protected Storage Service Access
Detects access to a protected_storage service over the network. Potential abuse of DPAPI to extract domain backup keys from Domain Controllers
RDP over Reverse SSH Tunnel WFP
Detects svchost hosting RDP termsvcs communicating with the loopback address
Register new Logon Process by Rubeus
Detects potential use of Rubeus via registered new trusted logon process
Service Registry Key Read Access Request
Detects "read access" requests on the services registry key. Adversaries may execute their own malicious payloads by hijacking the Registry entries used by services. Adversaries may use flaws in the permissions for Registry keys related to services to redirect from the originally specified executable to one that they control, in order to launch their own code when a service starts.
Remote PowerShell Sessions Network Connections (WinRM)
Detects basic PowerShell Remoting (WinRM) by monitoring for network inbound connections to ports 5985 OR 5986
Replay Attack Detected
Detects possible Kerberos Replay Attack on the domain controllers when "KRB_AP_ERR_REPEAT" Kerberos response is sent to the client
SAM Registry Hive Handle Request
Detects handles requested to SAM registry hive