Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects attempts to download raw payload files (PowerShell scripts, executables, DLLs, batch files, VBScripts, Python scripts, or shell scripts) from raw.githubusercontent.com. This activity is often associated with adversaries attempting to retrieve malicious tools or scripts from code repositories.
TLS Certificate Harvesting Sweep
Suricata
This rule detects a TLS certificate harvesting sweep, characterized by a high volume of TLS Server Name Indication (SNI) requests from a single source within a short period. This behavior is indicative of reconnaissance activities where an attacker is attempting to collect information about services running on various hosts by observing their TLS certificates.
This rule detects a NetBIOS Name Service enumeration sweep. It triggers an alert when 15 or more UDP packets destined for port 137 (NetBIOS Name Service) on the home network are observed from a single source IP within a 30-second window. This behavior is indicative of an attacker attempting to discover hosts and services on a network.
This rule detects HTTP requests to 'crt.sh', a Certificate Transparency log search engine. Such requests can indicate an adversary performing reconnaissance to gather information about an organization's digital certificates and domains.
This Suricata rule detects potential steganography payloads embedded within image downloads. It specifically looks for the JPEG file signature `FF D8 FF` within the first 3 bytes of an HTTP response, combined with a large file size (greater than 500KB). The rule also includes a threshold to prevent excessive alerts, triggering if 5 such downloads occur from the same destination within 60 seconds. This behavior is indicative of an attempt to hide malicious code or data within seemingly innocuous image files to evade detection.
This rule detects potential domain fronting by identifying a mismatch between the Server Name Indication (SNI) field in the TLS handshake and the Host header, specifically when the SNI field contains domains commonly used for content delivery networks (CDNs) like cloudfront.net, azureedge.net, or fastly.net. This technique can be used to obfuscate the true destination of network traffic, often for malicious purposes such as bypassing censorship or exfiltrating data.
This rule detects attempts to download known exploit framework tools such as Metasploit, Cobalt Strike, Empire, Covenant, Sliver, or Havoc by inspecting HTTP URI content. The detection is based on case-insensitive pattern matching within the HTTP URI.
Payload Download from GitLab Raw
Suricata
This rule detects attempts to download executable or script files (PowerShell, executable, DLL, shell script, Python script) from the 'raw' content section of gitlab.com. This behavior is often associated with adversaries staging or retrieving malicious payloads.
This rule detects attempts to execute commands via an unauthenticated Docker API. Specifically, it looks for HTTP POST requests to the '/exec' endpoint on TCP port 2375, which is commonly used for unauthenticated Docker daemon access. This could indicate an attacker attempting to gain control or execute arbitrary commands within Docker containers or the host system.
This rule detects attempts to exploit the Heartbleed vulnerability (CVE-2014-0160) by identifying a specific pattern in TLS heartbeat requests. It looks for a TLS heartbeat request with a type of 0x18 (heartbeat request) and a length greater than 3 bytes, which is indicative of an oversized heartbeat request used in the Heartbleed exploit.
This rule detects attempts to exploit the Shellshock Bash vulnerability via CGI. It specifically looks for HTTP requests containing the string "() {" in the header, which is characteristic of the Shellshock exploit payload used to inject arbitrary commands.
This Suricata rule detects Kerberos unconstrained delegation abuse by looking for a specific byte sequence in UDP traffic destined for port 88 (Kerberos). The byte sequence '|a0 03 02 01 05 a1 03 02 01 0d|' is indicative of a specific Kerberos message structure that can be associated with unconstrained delegation. Unconstrained delegation allows a service to impersonate any user to any other service on the network, which can be abused by attackers for privilege escalation and lateral movement.
This rule detects attempts to exploit the PrintNightmare vulnerability over SMB. It specifically looks for network traffic on port 445 (SMB) containing the strings "spoolss" and "RpcAddPrinterDriverEx" in a case-insensitive manner, indicating an attempt to leverage the Print Spooler service for privilege escalation.
This rule detects attempts to modify Group Policy Objects (GPOs) over Server Message Block (SMB) by looking for HTTP PUT requests containing '\SYSVOL\' and '\Policies\' in the URI. This activity can indicate an adversary attempting to escalate privileges or establish persistence within an Active Directory domain.
This Suricata rule detects HTTP requests containing 'VBoxService' in the URI. This string is associated with VirtualBox Guest Additions, which are often installed in virtualized environments. The presence of such a string in network traffic can indicate that a system is a virtual machine, which attackers or malware might query to detect if they are running in a sandbox or virtualized analysis environment. This detection is categorized as 'trojan-activity' and is related to discovery tactics.
HTTPS Server Banner Grabbing
Suricata
This rule detects HTTPS server banner grabbing attempts. It triggers an alert when a client sends 20 or more 'HEAD' HTTP requests to an HTTPS server on port 443 within a 30-second window, indicating an attempt to gather information about the server.
This rule detects HTTP requests to the Azure Instance Metadata Service (IMDS) IP address (169.254.169.254) with the URI containing 'metadata/instance'. This activity indicates an attempt to discover information about the Azure virtual machine instance, which can be a legitimate administrative action or an adversary attempting to collect credentials and other sensitive data.
This rule detects potential session cookie theft and bulk cookie exfiltration by monitoring HTTP traffic for large cookie sizes (greater than 500 bytes) being sent from the internal network to external servers. A threshold of 20 such events within 60 seconds from a single source IP triggers the alert, indicating suspicious activity that could be related to an attacker exfiltrating stolen session cookies.
This rule detects a PowerShell Empire C2 beacon pattern over HTTP. Specifically, it looks for HTTP POST requests to '/index.jsp' where the client body contains a base64-like encoded string of at least 200 characters, indicated by the PCRE pattern. This pattern is characteristic of how PowerShell Empire agents communicate with their command and control server.
This rule detects default beacon check-ins from Cobalt Strike. It specifically looks for HTTP POST requests to the URI '/submit.php' with a User-Agent string matching the pattern 'Mozilla/5.0 (compatible; MSIE [0-9]/'. This combination of indicators is characteristic of the default configuration of Cobalt Strike's beacon communication.
This rule detects attempts to exploit a Local File Inclusion (LFI) vulnerability to read the Windows Security Account Manager (SAM) database. It specifically looks for HTTP requests containing the string "\windows\system32\config\sam" in the URI, which is a common path for the SAM file on Windows systems. Successful exploitation of such a vulnerability could lead to the disclosure of hashed user credentials.
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