Darshan Thummar
@MightyCompletionist
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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.
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