Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects attempts to clear system log files, specifically '/var/log/', via a remote SSH connection. It looks for the string "> /var/log/" within TCP traffic on port 22 (SSH) flowing from a client to a server, ignoring case. This activity is often associated with an attacker trying to cover their tracks by removing evidence of their presence.
This rule detects network traffic on port 445 (SMB) containing the strings "cacls" and "/G Everyone:F" (case-insensitive). This combination suggests an attempt to weaken folder permissions on a Windows system by granting full control to 'Everyone' using the `cacls` command, potentially via remote registry access or a similar mechanism that transmits the command over the network.
This rule detects email spoofing attempts where the 'From' address domain does not match the 'Return-Path' address domain. It specifically looks for SMTP traffic on port 25, ensuring the flow is established and to the server. The rule uses PCRE to extract the domain from the 'From' header and then checks if the 'Return-Path' header contains a different domain.
This rule detects attempts to copy the NTDS.dit Active Directory database file over SMB (Server Message Block) to a server. The rule specifically looks for the string "ntds.dit" within TCP traffic destined for port 445 (SMB). This activity is highly suspicious as the NTDS.dit file contains critical Active Directory information, including hashed user credentials, and its exfiltration is a common technique used by attackers for credential dumping.
This rule detects attempts to harvest Group Policy Preferences (GPP) credentials from the SYSVOL share over SMB. It specifically looks for network traffic on port 445 (SMB) containing the strings "SYSVOL" and "Groups.xml" in a case-insensitive manner, indicating a potential attempt to access the file where GPP credentials might be stored.
This rule detects attempts to read AutoLogon credentials from the Windows Registry over the network, specifically targeting SMB (port 445) traffic. It looks for the strings 'DefaultPassword' and 'Winlogon' in a case-insensitive manner within the TCP payload, indicating a potential attempt to extract stored credentials used for automatic login.
This rule detects the creation of a systemd timer via a remote SSH session. It specifically looks for TCP traffic on port 22 (SSH) containing the commands 'systemctl enable' and '.timer' (case-insensitive), indicating an attempt to enable a systemd timer unit.
This rule detects potential macOS XPC Service abuse via remote SSH. Specifically, it looks for TCP traffic on port 22 (SSH) within the home network that contains the strings "launchctl" and "submit" (case-insensitive). This combination suggests an attempt to use the launchctl command to submit a job, potentially exploiting XPC services, over an SSH connection.
This rule detects an attempt to access the ESXi direct SSH shell by looking for the 'vim-cmd' string in TCP traffic directed to port 22 (SSH) on the home network. This indicates an administrative command being executed directly on an ESXi host via SSH.
This rule detects the writing of an 'autorun.inf' file to a Server Message Block (SMB) share, specifically targeting removable media shares. The presence of 'autorun.inf' on removable media is often associated with malware attempting to auto-execute when the media is inserted into a Windows system.
This rule detects network traffic indicative of a domain account being used for lateral movement via SMB. It specifically looks for NTLMSSP authentication within SMB traffic directed to port 445 on the home network, containing the string 'domain' (case-insensitive). A threshold of 10 occurrences within 60 seconds from the same source IP triggers the alert, suggesting a potential brute-force or rapid access attempt.
This rule detects potential rogue DHCP servers on a wireless segment by looking for UDP traffic on port 67 (DHCP server port) with a specific DHCP message type (likely a DHCP offer or acknowledgement, indicated by '|02|' at offset 0). It uses a thresholding mechanism to trigger an alert if 3 such packets are observed from the same source within 10 seconds, which helps to reduce false positives from single, isolated packets.
This rule detects HTTP traffic to 'teams.microsoft.com' with a URI containing '/messages/'. It is designed to identify potential social engineering attempts where malicious links are delivered via Microsoft Teams messages. The rule uses a threshold of 5 occurrences within 60 seconds from the same source IP to reduce false positives.
This rule detects network connections from devices that might be Raspberry Pis or Hak5 devices, based on their HTTP User-Agent string. Specifically, it looks for User-Agents containing 'python-requests' or 'curl/' followed by a digit, indicating the use of common command-line tools or Python libraries for making HTTP requests. The rule is configured to trigger an alert if 10 such connections are observed from the same source IP within 10 seconds, suggesting automated or frequent activity.
This rule detects DHCP requests originating from a MAC address that is not recognized or expected within the network. It uses a threshold to prevent excessive alerts from a single source, triggering if a source makes more than one DHCP request within a 5-second window. This could indicate an unauthorized device attempting to join the network or a spoofed MAC address.
This rule detects HTTP requests where the 'Host' header contains patterns indicative of free hosting services (000webhost, infinityfree, byethost). These services are often abused by attackers to host malicious infrastructure due to their low cost and ease of setup. The rule specifically looks for these patterns in HTTP traffic flowing from the home network to any destination.
This rule detects a pattern of bulk account registration attempts by monitoring HTTP POST requests to URIs containing 'register'. It triggers an alert if 10 such requests are observed from the same source IP within a 60-second window, indicating potential automated account creation or abuse.
This rule detects the installation of a new self-signed TLS certificate that might be used by a Command and Control (C2) server. It specifically looks for TLS certificates where both the issuer and subject Common Name (CN) are at least 5 alphanumeric characters long and the 'not before' date is in the current or future years (2024-2029). This combination of characteristics can indicate a newly generated, potentially malicious self-signed certificate.
This rule detects attempts to exploit the Zerologon (CVE-2020-1472) vulnerability, a critical privilege escalation flaw in Microsoft's Netlogon Remote Protocol. It specifically looks for network traffic on TCP port 445 (SMB) containing the 'NetrServerAuthenticate3' function call with a specific sequence of null bytes, which is indicative of an unauthenticated Netlogon session setup without signing and sealing, a key characteristic of the Zerologon exploit.
This rule detects attempts to remotely install Windows services over Server Message Block (SMB). It specifically looks for network traffic on port 445 (SMB) containing the strings "svcctl" and "CreateService" in a case-insensitive manner, indicating a service control request to create a new service. This activity is often associated with adversaries establishing persistence on a compromised system.
This rule detects NTP amplification DDoS attacks by looking for UDP traffic on port 123 (NTP) with a specific content signature ('|17 00 03 2a|') and a high threshold of 50 packets within 5 seconds from the same destination. This pattern is indicative of an NTP monlist request, which can be abused for amplification attacks.
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