Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects outbound HTTPS traffic containing TLS certificates with common names associated with known command-and-control (C2) frameworks like Metasploit and Empire. These frameworks often use self-signed certificates with default or easily identifiable issuer names when establishing C2 communication.
This rule detects attempts to exploit the Log4Shell vulnerability (CVE-2021-44228) by monitoring HTTP headers (User-Agent, X-Forwarded-For, Referer) for JNDI lookup strings. The JNDI lookup mechanism in vulnerable Log4j libraries allows an attacker to execute arbitrary code by pointing the lookup to a malicious LDAP, RMI, or DNS server.
This rule detects ICMP Echo Request (type 8) packets with an unusually large payload (greater than 64 bytes). Such anomalies often indicate that an adversary is using ICMP as a covert channel for command-and-control (C2) communications or data exfiltration, by embedding arbitrary data within the ICMP payload fields.
Detects network traffic associated with PsExec lateral movement activity, specifically looking for the creation of the PSEXESVC named pipe over SMB/ADMIN$ shares, which is commonly used by PsExec to remotely execute services and commands on target systems.
Detects ICMP Type 8 (Echo Request) packets with a payload size exceeding 1000 bytes. This is a common indicator of ICMP tunneling, where attackers encapsulate data within ICMP packets to bypass network security controls for command and control or data exfiltration.
Detects outbound HTTPS traffic on high ports where the TLS SNI header consists of a 8-20 character random alphanumeric string. This pattern is indicative of default configurations for Metasploit Meterpreter Reverse HTTPS payloads attempting to establish a Command and Control connection.
Detects HTTP requests containing directory traversal patterns (e.g., ../, %2e%2e/) combined with attempts to access sensitive system files like /etc/passwd, shadow files, or Windows system configuration files (boot.ini, win.ini).
This rule detects attempts to inject malicious JavaScript code via HTTP URI requests. It uses PCRE pattern matching to identify common XSS indicators such as <script> tags, JavaScript event handlers (onerror, onload), and attempts to access document.cookie, which are indicative of stored or reflected Cross-Site Scripting (XSS) attack patterns.
This rule detects large HTTP POST requests (greater than 10MB) originating from the internal network to external destinations, which may indicate bulk data exfiltration.
Detects network traffic associated with PsExec lateral movement activity, specifically looking for the creation of the PSEXESVC named pipe over SMB/ADMIN$ shares, which is commonly used by PsExec to remotely execute services and commands on target systems.
Detects ICMP Type 8 (Echo Request) packets with a payload size exceeding 1000 bytes. This is a common indicator of ICMP tunneling, where attackers encapsulate data within ICMP packets to bypass network security controls for command and control or data exfiltration.
Detects multiple failed SSH authentication attempts originating from a single source IP within a short timeframe, which is indicative of a brute-force or credential-stuffing attack against SSH services.
This rule detects the use of the PSEXESVC named pipe during a write operation over the SMB protocol, which is indicative of lateral movement using the PsExec tool.
Detects outbound HTTP POST requests to external networks that match a known Emotet C2 traffic pattern. The rule specifically looks for HTTP POST requests using an 'application/x-www-form-urlencoded' Content-Type and a URI structure consisting of randomized alphanumeric segments (4-20 characters long). This structure is characteristic of Emotet's communication with its command-and-control infrastructure.
Detects outbound HTTP POST requests where the Content-Length header indicates a transfer size exceeding 10MB to external (non-HOME_NET) addresses. This pattern is indicative of potential data exfiltration via HTTP.
Detects outbound HTTP POST requests characteristic of QakBot malware command and control (C2) activity. The rule identifies a specific combination of a hardcoded User-Agent string ('Trident/7.0') and a URI pattern consisting of 4 to 32 alphanumeric characters ending in .php.
Detects the use of the FTP STOR command to transfer files with sensitive extensions (.docx, .pdf, .xlsx, .zip, .7z) to external networks. This behavior is indicative of potential data exfiltration via an unencrypted alternative protocol.
Detects HTTP POST requests containing multipart form data that include suspicious PHP functions commonly associated with webshells, such as eval(), base64_decode(), system(), or passthru(). This indicates a potential attempt to upload or execute a malicious PHP script on a web server.
Detects HTTP GET requests originating from internal network hosts to external destinations that match known Emotet C2 communication patterns, specifically those using hardcoded URI paths such as '/wp-content/', '/wp-admin/', or '/tmp/' combined with the 'Accept-Encoding: identity' header.
Detects a high frequency of incoming TCP SYN packets targeting port 3389 (RDP) from a single source within a short time window. This behavior is indicative of a brute-force or credential-stuffing attack against Remote Desktop services.
Detects outbound HTTPS traffic on non-standard ports that matches a specific JA3 fingerprint associated with the Sliver command and control framework. This indicates potential beaconing or C2 communication from a compromised host.
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