Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects attempts to create new user accounts via SMB (Server Message Block) by looking for the 'NetUserAdd' function call within SMB traffic. This could indicate an attacker attempting to establish persistence or escalate privileges by creating new accounts on a target system.
This rule detects attempts to execute remote services over SMB, specifically looking for traffic on port 445 containing both the SMB signature and the 'Service Control' string. This combination suggests an attempt to interact with or manipulate services on a remote system via SMB, which is a common technique used by attackers for lateral movement or privilege escalation.
This rule detects potential NTLM Relay attacks over SMB. It specifically looks for TCP traffic on port 445 (SMB) directed to the home network, and within that traffic, it identifies the presence of both the SMB protocol signature ('|FF|SMB') and the NTLMSSP (NTLM Security Support Provider) signature. This combination suggests an attempt to relay NTLM authentication.
This rule detects potential network sniffing by identifying an unusual mix of network protocols originating from a single source IP address. Specifically, it triggers an alert if a source IP sends 10 or more packets within 60 seconds that are neither TCP (protocol 6), UDP (protocol 17), nor ICMP (protocol 1). This behavior could indicate an attacker using tools to capture raw network traffic, as these tools often process protocols beyond the common ones.
This rule detects Address Resolution Protocol (ARP) spoofing attempts by looking for ARP reply packets (opcode 2) on the network. A threshold is applied to trigger an alert if 20 or more ARP replies are observed from the same source within a 10-second window, which is indicative of malicious ARP activity.
This rule detects HTTP requests where the URI contains the string "/var/log/" (case-insensitive). This pattern is indicative of an attempt to access system log files directly via a web server, which could be part of an information gathering or defense evasion tactic.
This rule detects DNS queries to 'discord.com' with a high frequency (20 queries within 60 seconds from the same source IP). This behavior is indicative of Command and Control (C2) activity leveraging Discord webhooks, as described in MITRE ATT&CK technique T1102. Attackers often use legitimate services like Discord for C2 to blend in with normal network traffic and evade detection.
This rule detects non-HTTP traffic on TCP port 443. It specifically looks for established TCP connections to port 443 where the application layer protocol is neither TLS nor HTTP. This could indicate command and control (C2) activity attempting to blend in with legitimate HTTPS traffic.
This rule detects potential Command and Control (C2) communication over SMTP (port 25). It specifically looks for TCP traffic originating from the home network to any destination on port 25, indicating an established connection. A threshold of 10 connections within 300 seconds from the same source IP is set to reduce false positives, suggesting a high volume of SMTP activity that could be indicative of C2.
This rule detects a pattern of mass file deletion over SMB (Server Message Block) protocol. It triggers an alert if 100 or more SMB packets containing specific content (likely indicating file operations) are observed within a 10-second window, originating from the same source IP address and destined for port 445 (SMB). This behavior is often associated with ransomware or other malicious activities aiming to impact data availability.
Detects DNS over HTTPS (DoH) traffic originating directly from edge appliances (e.g., to 8.8.8.8 on port 443), which VerdantBamboo uses to obscure BRICKSTORM C2 resolution.
This rule detects HTTP network connections to TeamViewer domains, specifically 'teamviewer.com' or 'router.teamviewer.com'. It triggers an alert if five such connections are observed from the same source IP within a 60-second window. This behavior is indicative of TeamViewer being used for persistent command and control (C2) activities, often associated with trojan activity.
This rule detects attempts to modify SSH authorized_keys files over a network connection, which could indicate an attacker establishing backdoor access. It specifically looks for the string "authorized_keys" within TCP traffic destined for port 22 (SSH).
This rule detects potential DLL hijacking attempts targeting Terminal Services (RDP) by looking for the string "termsrv.dll" within TCP traffic destined for port 3389 (RDP). This could indicate an attacker attempting to load a malicious DLL in place of the legitimate termsrv.dll to maintain persistence or execute arbitrary code.
This rule detects network traffic indicating the installation of a Transport Agent on an Exchange server. It specifically looks for the strings "TransportAgent" and "Install-TransportAgent" in TCP traffic directed to port 25 of the home network, suggesting a potential malicious or unauthorized installation of an Exchange Transport Agent.
This rule detects attempts to create a stored procedure in a Microsoft SQL Server database that includes the 'xp_cmdshell' extended stored procedure. 'xp_cmdshell' allows execution of operating system commands directly from SQL Server, and its use in a newly created stored procedure can indicate an attacker establishing persistence or attempting to execute arbitrary commands on the underlying system.
This rule detects a sequence of TCP SYN packets with a zero data size, originating from any source to any destination within the home network. The detection is triggered when 5 such packets are observed from the same source within a 3-second window. This pattern is indicative of a 'Magic Packet Implant Activation Sequence', which could be used by an attacker for persistence or command and control.
This rule detects the remote creation of a WMI event subscription, specifically looking for '__EventFilter' and 'CommandLineEventConsumer' within TCP traffic on port 445. This activity is often associated with persistence mechanisms used by attackers.
This rule detects attempts to modify Cisco router firmware using ROMMONkit. It specifically looks for TCP traffic to the HOME_NET on port 23 (Telnet) containing the case-insensitive strings "rommon" and "tftpdnld". This combination suggests an attempt to interact with the router's ROM Monitor mode for firmware manipulation, often associated with malicious activities like installing backdoors or persistent malware.
This rule detects network traffic on port 445 (SMB) containing the strings "LSASS" and "AddDll" (case-insensitive). This combination of strings suggests an attempt to register a malicious DLL with the Local Security Authority Subsystem Service (LSASS) for persistence, a technique often used by malware to maintain access on a compromised system. The flow is set to 'to_server' and 'established', indicating an outgoing connection from the monitored network to a server, and that the TCP connection has been successfully established.
This rule detects network traffic on TCP port 445 (SMB) containing the case-insensitive strings "powercfg" and "change". This combination suggests an attempt to modify system power settings, potentially to prevent a system from sleeping or shutting down, which could be a persistence mechanism.
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