Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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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 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.
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 potential lateral movement attempts using DCOM-based WMI calls to the remote OXID Resolver on port 135. Attackers often abuse DCOM to remotely trigger WMI methods, enabling remote code execution, discovery, or other malicious activities. The rule triggers on the characteristic DCOM OXID Resolve packet structure associated with this activity.
Detects SMB authentication attempts using NTLM with a blank Lan Manager (LM) hash. This specific pattern is often associated with Pass-the-Hash attacks where tools inject malformed or blank hashes to initiate authentication, a common indicator of lateral movement attempts.
This rule detects the outbound transmission of email attachments via SMTP (ports 25 and 587) that contain archived file formats (zip, 7z, tar.gz, tgz). Attackers often compress collected data into archives to facilitate exfiltration and minimize the time required for data transfer.
This rule detects potential command and control (C2) activity leveraging DNS tunneling. It identifies high-frequency DNS queries that contain unusually long subdomain labels (51 characters or more), which is a common technique used to encode data or commands within DNS protocol traffic to bypass network security controls.
Detects multiple SSH authentication attempts from a single source IP address within a short timeframe, which is indicative of a brute force or password guessing attack against SSH services.
Detects repeated use of the FTP 'STOR' command to transmit data to an external host within a short timeframe. The STOR command is used in the File Transfer Protocol (FTP) to upload a file to the server. An unusual frequency of this command toward external destinations may indicate data exfiltration.
Detects repeated RDP connection attempts to port 3389 from a single source within a short timeframe, characteristic of brute force or password spraying activity. The rule monitors for consecutive TLS ClientHello or MCS Connect-Initial packets.
Detects high-frequency TCP SYN scanning behavior targeting Telnet (port 23) and SSH (port 22) ports, characteristic of Mirai botnet propagation and reconnaissance activities.
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 potential command and control (C2) beaconing activity using DNS tunneling. It monitors for a high frequency of DNS TXT record queries to long subdomains (exceeding 50 characters), which is a common characteristic of tools like DNScat and iodine that encode data within DNS requests.
This rule detects HTTP requests attempting to perform Local File Inclusion (LFI) or path traversal attacks by searching for patterns such as '/../' sequences and common sensitive file paths like /etc/passwd, /etc/shadow, or /proc/self/environ in the URI.
Detects large HTTP POST requests (over 5MB) directed at external hosts that utilize multipart or chunked encoding, which are commonly used to obfuscate or stream large volumes of data during an exfiltration event.
Detects outbound HTTP POST requests to suspicious URIs and subsequent inbound responses containing executable binary (PE) signatures, characteristic of Emotet malware command-and-control (C2) activity.
This rule detects the outbound transmission of email attachments via SMTP (ports 25 and 587) that contain archived file formats (zip, 7z, tar.gz, tgz). Attackers often compress collected data into archives to facilitate exfiltration and minimize the time required for data transfer.
This rule monitors for HTTP POST requests to external networks containing 'gtag=' in the URI, which is a known technique used by the TrickBot malware to exfiltrate its group identifier during C2 communication.
Detects high-frequency HTTP 401 Unauthorized responses associated with Basic Authentication attempts within a short timeframe, indicating a potential credential brute-force attack.
This rule monitors for FTP 'STOR' commands followed by large data transfers (exceeding 64KB) initiated from internal hosts to external destinations. This pattern is often indicative of data exfiltration using the File Transfer Protocol (FTP).
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