Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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XOR Encoded C2 Traffic Pattern
Suricata
This rule detects HTTP client body traffic that appears to be XOR encoded, characterized by a long sequence of non-printable ASCII characters (bytes 0x01-0x1f and 0x7f-0xff) of at least 50 characters. This pattern is often indicative of Command and Control (C2) communication used by malware to evade detection.
Bitsadmin Tool Transfer Download
Suricata
This rule detects the use of the 'bitsadmin' tool in HTTP user agent strings during a file transfer download. Bitsadmin is a legitimate Windows command-line tool used to create, manage, and monitor download and upload jobs, but it is frequently abused by adversaries for command and control, data transfer, and persistence.
This rule detects network reconnaissance activity by identifying HTTP requests where the User-Agent header contains the string "masscan". Masscan is a fast internet port scanner, and its User-Agent string often indicates scanning activity, which aligns with the MITRE ATT&CK technique T1595.002 for active scanning during reconnaissance.
This rule detects an SSH brute force attack by monitoring TCP connections to port 22 (SSH) on the home network. It triggers an alert if more than 20 TCP SYN packets are observed from a single source IP address within a 60-second window, indicating a high volume of connection attempts characteristic of a brute force.
This rule detects suspicious DNS lookups for 'pastebin.com'. It triggers an alert if a source IP performs 5 or more DNS queries for 'pastebin.com' within a 60-second window. This activity is often associated with reconnaissance, as attackers may use Pastebin to host command and control (C2) information, exfiltrated data, or other malicious content.
This rule detects unauthenticated access attempts to the Docker Daemon API, specifically targeting TCP port 2375. It triggers on the initial SYN packet of a TCP connection to this port, indicating an attempt to establish a connection to the Docker API without authentication. This activity is often associated with privilege escalation attempts, as an unauthenticated Docker API can be exploited to gain control over the host system.
This rule detects the creation of remote scheduled tasks over SMB by looking for the string "schtasks" in TCP traffic destined for port 445 (SMB). This activity is often associated with persistence techniques where attackers establish scheduled tasks on remote systems.
This rule detects HTTP web requests that contain the string "cmd.exe" in the URI, indicating an attempt to execute a command shell via a web request. This is often associated with web application attacks where an attacker tries to leverage a vulnerability to run system commands.
This rule detects HTTP requests where the URI contains the string "-EncodedCommand" case-insensitively. This pattern is commonly associated with PowerShell commands that are base64 encoded, often used by attackers to obfuscate malicious scripts. The rule specifically looks for this string in the HTTP URI, indicating an attempt to download or execute an encoded PowerShell command.
This rule detects HTTP requests that contain patterns indicative of a PowerShell download cradle. Specifically, it looks for 'powershell' and 'IEX' (Invoke-Expression) within the HTTP URI, suggesting an attempt to download and execute a script using PowerShell.
This rule detects attempts to execute the Unix shell '/bin/bash' via HTTP requests. Specifically, it looks for the string '/bin/bash' within the URI of HTTP traffic flowing to the server. This could indicate an attacker attempting command injection or other web-based exploitation to gain shell access.
This rule detects network service scanning activity by identifying a high volume of TCP SYN packets (flags:S) from a single source IP address to multiple destinations within the HOME_NET over a short period. Specifically, it triggers if 50 or more SYN packets are observed from the same source within 10 seconds. This behavior is indicative of an attacker attempting to discover open ports and services on internal network hosts, a common reconnaissance technique.
This rule detects a potential SSH password brute force attack. It triggers an alert if there are 30 or more TCP connections to port 22 (SSH) on the home network from a single source IP address within a 60-second window. The 'flow:to_server' and 'flags:S' indicate that it's looking for new connection attempts (SYN packets) directed towards the server.
This rule detects potential DNS tunneling activity by identifying DNS queries with high entropy subdomains. Specifically, it looks for subdomains that consist of 30 or more alphanumeric characters (a-z, 0-9). A threshold is applied, triggering an alert if 5 such queries are observed from the same source IP within a 60-second window. This pattern is often indicative of data exfiltration or command and control communication over DNS.
This rule detects outbound TCP connections from any source to the local network ($HOME_NET) on port 9150. This port is commonly used by Tor Browser for its SOCKS proxy, indicating potential use of Tor for anonymization or to bypass network restrictions. The rule specifically looks for the SYN flag in the TCP handshake, signifying the initiation of a connection.
This rule detects outbound TCP connections from any source to the local network ($HOME_NET) on port 9050, specifically looking for the SYN flag. Port 9050 is commonly associated with Tor SOCKS proxy services. This activity is classified as a policy violation and is linked to the MITRE ATT&CK technique T1090.003, which involves using a Tor proxy for defense evasion.
This rule detects a high volume of IMAP/SSL connections to port 993 from a single source IP address within a short timeframe, which could indicate an attempt to collect emails in bulk, potentially associated with MITRE ATT&CK technique T1114 (Email Collection). The threshold is set to 30 connections within 60 seconds from the same source.
This rule detects attempts to establish a WinRM HTTPS connection (port 5986) to a host on the home network. It specifically looks for TCP SYN packets (flags:S) and triggers if three such connection attempts are made from the same source within 60 seconds. This pattern can indicate lateral movement activity using WinRM over HTTPS.
This rule detects potential data exfiltration to Dropbox cloud storage. It specifically looks for HTTP POST requests to 'api.dropboxapi.com' with a data size greater than 5000 bytes, indicating a significant upload.
This rule detects large HTTP POST requests originating from the internal network ($HOME_NET) to any external destination. It specifically looks for HTTP POST methods and a data size greater than 10,000 bytes. A detection filter is applied to track by source IP, triggering an alert if 20 such large POST requests are observed within a 60-second window. This behavior is indicative of potential data exfiltration over command and control (C2) channels, as large amounts of data are being sent out of the network.
This rule detects HTTP downloads of common script file types (PowerShell, VBScript, JavaScript, HTML Application, Batch, Command) from any source to the internal network. This activity is often associated with initial access or execution techniques where adversaries download malicious scripts to a compromised host.
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