Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects potential tampering with financial transaction data during transit. It specifically looks for TCP traffic flowing to a server, where the data size is between 100 and 500 bytes, and the content contains both "amount" and "transfer" (case-insensitive). This combination suggests an attempt to modify financial transaction details.
This rule detects the use of AMQP (Advanced Message Queuing Protocol) on port 5672, specifically looking for the 'AMQP' content within the first 4 bytes of the TCP payload. It triggers an alert if this pattern is observed 5 times within 60 seconds from the same source IP, indicating potential Command and Control (C2) activity using AMQP as a communication channel.
FTP Used as C2 Command Channel
Suricata
This rule detects potential command and control (C2) activity over FTP by identifying a high frequency of 'RETR' (retrieve) commands. A threshold of 20 'RETR' commands within 60 seconds from the same source IP address triggers the alert. This pattern can indicate an attacker using FTP to download commands or tools from a C2 server.
This rule detects HTTP POST requests from the home network to any destination that contain a large amount of junk data padding in the client body. Specifically, it looks for a client body size greater than 1000 bytes and a PCRE match for at least 500 alphanumeric characters, indicating potential command and control (C2) communication using data padding for obfuscation or to bypass detection. A threshold is set to trigger an alert if 10 such requests are observed from the same source within 60 seconds.
This rule detects network traffic that uses a TLS certificate with the common name (CN) 'Major Cobalt Strike'. This specific CN is a known default value used by the Cobalt Strike command and control (C2) framework. Detection of this certificate indicates potential Cobalt Strike C2 communication within the network.
This rule detects unusual application traffic on TCP port 8443. It triggers an alert if a source IP address initiates more than 20 TCP connections to port 8443 within a 60-second window. This threshold-based detection aims to identify potentially malicious or anomalous communication patterns that might indicate command and control activity or data exfiltration over a non-standard port often used for HTTPS.
This rule detects potential data staging activity on a remote SMB share. It specifically looks for traffic to port 445 (SMB) containing 'ADMIN$' (case-insensitive) with a data size greater than 65000 bytes. A threshold of 20 such events within 60 seconds from the same source IP will trigger an alert, indicating a high volume of data being transferred to an administrative share, which could precede exfiltration.
This rule detects potential RDP session hijacking attempts by looking for the string "tscon" within TCP traffic destined for port 3389 (RDP). The 'tscon' command can be used to connect to or take control of another user's RDP session.
This rule detects the planting of script files, specifically PowerShell scripts (.ps1), on shared network drives. It looks for SMB traffic directed to a server on port 445 (SMB) that contains both the string ".ps1" (case-insensitive) and the string "\\share\\" (case-insensitive). This activity is indicative of an attacker staging scripts on a network share for potential lateral movement within a network.
This rule detects internal lateral movement attempts within a network using remote services. It specifically looks for TCP traffic originating from and destined to the home network, indicating internal communication. A threshold of 10 connections within 30 seconds from the same source IP is used to identify suspicious activity, suggesting a potential brute-force or rapid connection attempt indicative of lateral movement.
This rule detects attempts to enumerate the 'Domain Admins' group over SMB (Server Message Block) using the 'NetGroupGetUsers' function. This activity is often associated with reconnaissance by attackers trying to identify high-privilege accounts within a Windows domain.
This rule detects HTTP C2 traffic attempting to store a fileless payload in the Windows Registry. It specifically looks for HTTP responses (flow:to_client) containing the strings 'HKCU' (likely indicating a registry key path), 'powershell', and 'IEX' (Invoke-Expression), which are common indicators of PowerShell-based fileless malware using the registry for persistence or execution.
This rule detects network traffic on TCP port 445 (SMB) containing the string "DisableRealtimeMonitoring" (case-insensitive). This string is often associated with attempts to disable real-time monitoring features of security products, typically by modifying registry keys. The detection is focused on traffic flowing from any source to the home network, specifically to the SMB port, and only on established connections. This activity is indicative of an attacker attempting to evade detection by crippling security software.
This rule detects attempts to set the hidden attribute on a file using the 'attrib +h' command over a network connection to a Windows machine (port 445). This technique is often used by attackers to hide malicious files from users and system administrators, contributing to defense evasion.
This rule detects attempts to create hidden files or directories in the /tmp directory on a remote host via SSH. Specifically, it looks for SSH traffic (tcp port 22) containing the strings "touch ." and "/tmp/." (case-insensitive). This behavior is often associated with adversaries attempting to hide their artifacts on a compromised system.
This rule detects a TLS downgrade attack where a client attempts to establish a connection using a weaker TLS protocol version, specifically TLS 1.0. This could indicate an attacker forcing a less secure communication channel to exploit vulnerabilities in older TLS versions.
This rule detects potential modification of a network device's system image via TFTP. It specifically looks for UDP traffic on port 69 (TFTP) where the packet size is greater than 50000 bytes and contains the byte sequence "|00 02|" at a depth of 2 bytes, which is indicative of a TFTP write request (opcode 2). The large packet size suggests a system image transfer.
This rule detects HTTP traffic where the User-Agent header contains 'Microsoft', 'Google', or 'Amazon' (case-insensitive) and the Host header contains an IPv4 address. This combination could indicate an attacker impersonating a legitimate vendor's API client while making direct IP-based requests, potentially bypassing DNS-based security controls or targeting internal services.
This rule detects network traffic on port 445 (SMB) containing the string "SetFileSecurity" (case-insensitive). This string is associated with modifying file security descriptors, specifically Discretionary Access Control Lists (DACLs), which can be used by attackers to hide malicious files or achieve persistence by altering permissions.
This rule detects network traffic to port 88 (Kerberos) that exhibits characteristics of a vulnerability exploit for credential access. Specifically, it triggers an alert if there are 30 or more TCP connections to port 88 on the HOME_NET within a 5-second window from a single source IP address, indicating a potential brute-force or rapid credential access attempt against a Kerberos service.
This rule detects attempts to copy the Chrome Login Data SQLite file over SMB. The rule specifically looks for SMB traffic (port 445) containing the strings "Login Data" and "AppData\Local\Google\Chrome" (case-insensitive). This activity is indicative of an attacker trying to exfiltrate sensitive browser data, specifically stored credentials.
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