Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects attempts to register a Netsh helper DLL for persistence. Netsh (Network Shell) is a command-line scripting utility that allows you to display or modify the network configuration of a locally running computer. Attackers can abuse the 'add helper' command to register a malicious DLL, which will then be loaded by Netsh whenever it runs, providing a persistence mechanism. The rule specifically looks for TCP traffic on port 445 (SMB) containing the strings "netsh" and "add helper" in a case-insensitive manner, indicating an attempt to use this technique.
This rule detects the use of the 'trap' command with 'EXIT' in TCP traffic, which is a common technique used for persistence on Unix-like systems. Attackers can use the 'trap' command to execute arbitrary commands when a shell exits, ensuring their malicious code runs even after a session is closed.
This rule detects when a TFTP (Trivial File Transfer Protocol) boot image is potentially pushed to a network device. It specifically looks for UDP traffic on port 69 (TFTP default port) directed to the home network, containing the byte sequence "|00 02|" (which often indicates a TFTP write request or a specific TFTP opcode) and having a data size greater than 10000 bytes, suggesting a large file transfer like a boot image.
This rule detects network traffic patterns indicative of an attempt to use the 'Active Setup' registry key for persistence. Specifically, it looks for TCP traffic on port 445 (commonly used for SMB/CIFS) directed to the home network, containing the strings 'Active Setup' and 'StubPath' (case-insensitive). This combination suggests an attacker might be trying to establish persistence by modifying the 'StubPath' value within an 'Active Setup' registry key, which Windows uses to run commands during user logon.
This rule detects network connections to known vulnerability intelligence purchase platforms (zerodium.com, crowdfense.com, exodus.gl). These platforms are often used by threat actors to acquire zero-day exploits or other vulnerabilities. Accessing these sites could indicate an organization or individual is attempting to purchase or sell such intelligence, which can be a precursor to malicious activity or a violation of organizational policy.
This rule detects network traffic indicating that reversible password encryption might be enabled in Active Directory. It specifically looks for the string "AllowReversiblePasswordEncryption" in TCP traffic destined for port 389 (LDAP). Enabling reversible password encryption stores passwords in a format that can be easily decrypted, making them vulnerable to theft if the system is compromised.
This rule detects network traffic on TCP port 445 (SMB) containing the string "Notification Packages" in a case-insensitive manner, flowing to the server. This pattern is indicative of an attempt to install a password filter DLL for credential harvesting, a technique used by attackers to capture user credentials.
This rule detects multiple TFTP (Trivial File Transfer Protocol) transfers to port 69 on the home network within a short timeframe. Specifically, it triggers an alert if three or more TFTP transfers from the same source IP address occur within a 30-second window. This activity can be indicative of a Pre-Boot Execution Environment (PXE) boot process, which often uses TFTP to transfer boot files, or potentially malicious activity involving file transfers via TFTP.
This rule detects attempts to drop a payload into the Microsoft Word startup folder via SMB. The detection is based on the presence of the string "Word\STARTUP" (case-insensitive) in SMB traffic flowing to the server on port 445. This activity is indicative of persistence mechanisms used by attackers to ensure malicious code executes when Word starts.
This rule detects when a file containing the string "XLSTART" (case-insensitive) is written to a network share via SMB. This is indicative of an attempt to establish persistence by placing malicious files in the Microsoft Office startup folder, which will be executed when Office applications launch.
This rule detects attempts to modify login scripts, specifically '.profile', on a remote host via SSH. The detection is based on observing the string ".profile" within TCP traffic destined for port 22 (SSH) on the home network. This activity could indicate an attacker establishing persistence by modifying user login scripts to execute malicious commands upon subsequent logins.
This rule detects the writing of a file containing both the string "Startup" (case-insensitive) and the string ".bat" (case-insensitive) to a remote host via the Server Message Block (SMB) protocol on port 445. This activity is indicative of an attempt to establish persistence by creating a startup script on a remote system.
This rule detects attempts to plant a DLL file in an application's 'Program Files' directory over SMB. This is a common technique used in DLL hijacking attacks, where a malicious DLL is placed in a location where a legitimate application will load it instead of the intended system DLL. The rule specifically looks for SMB traffic to port 445, containing '.dll' and '\Program Files\' in a case-insensitive manner, indicating a file transfer to a sensitive application directory.
This rule detects network traffic on TCP port 445 (SMB) containing the strings "system32" and "msv1_0.dll" in a case-insensitive manner. This pattern is indicative of an attempt to replace the authentication DLL (msv1_0.dll) on a remote Windows host, which is a known technique for persistence and credential manipulation.
This rule detects attempts to modify authentication configuration via LDAP by looking for the string "msDS-SupportedEncryptionTypes" in TCP traffic destined for port 389 (LDAP). This string is associated with changes to supported encryption types in Active Directory, which could be an indicator of persistence or privilege escalation.
This rule detects attempts to add an autostart entry via a remote registry write operation targeting TCP port 445 (SMB). It specifically looks for network traffic containing the strings "Run", "HKCU" (HKEY_CURRENT_USER), and "\Software\Microsoft\Windows", indicating a modification to the current user's run keys for persistence. This activity is often associated with malware or adversaries establishing persistence on a compromised Windows system.
Detects HTTP requests utilizing a specific, highly verbose, and legacy Internet Explorer 8 User-Agent string. This exact hardcoded string is utilized by a fileless .NET loader (originating from a malspam campaign) to download subsequent payload stages from its staging server.
This rule detects DNS TXT record responses containing a Base64 encoded payload of at least 60 characters. This pattern is often used by malware for command and control (C2) communication or data exfiltration, leveraging DNS tunneling to evade detection.
This rule detects Kerberos Pass-the-Ticket attacks where a Ticket Granting Service (TGS) request contains a forged Privilege Attribute Certificate (PAC). This is identified by specific byte sequences in UDP traffic on port 88, which is commonly used for Kerberos.
This rule detects an attempted pre-authentication Remote Code Execution (RCE) exploit against the Remote Desktop Protocol (RDP) service, commonly known as 'BlueKeep'. It specifically looks for a sequence of bytes within the RDP traffic on port 3389, indicating a potential exploit attempt.
This rule detects attempts to remotely shut down a system using the Server Message Block (SMB) protocol. It specifically looks for the string "InitiateSystemShutdown" within TCP traffic destined for port 445 (SMB). This activity can be indicative of an attacker attempting to disrupt services or systems.
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