Darshan Thummar
@MightyCompletionist
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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.
MSSQL Database DROP Destruction
Suricata
This rule detects attempts to drop a database on an MSSQL server. It specifically looks for the string "DROP DATABASE" in TCP traffic destined for port 1433 (the default MSSQL port). This activity is indicative of data destruction or sabotage.
This rule detects a mass account lockout pattern over LDAP. It triggers an alert if 20 or more LDAP requests containing the string "lockoutTime" are observed from a single destination IP address within a 60-second window. This behavior is indicative of an attacker attempting to lock out multiple user accounts, potentially as a denial-of-service attack or to facilitate other attacks like password spraying by preventing legitimate users from logging in.
This rule detects a TFTP (Trivial File Transfer Protocol) firmware upload attempt where the data size is greater than 10000 bytes. This could indicate an attempt to corrupt or replace the firmware on a device, potentially leading to denial of service or unauthorized control. The rule specifically looks for UDP traffic on port 69 (TFTP) with a specific content pattern and a large data size.
This rule detects an active IP block scan by monitoring TCP SYN packets. It triggers an alert if more than 100 SYN packets are observed from a single source IP address within a 10-second window, indicating a potential reconnaissance activity where an attacker is scanning a range of IP addresses to identify live hosts or open ports.
Detects unusually large HTTP POST requests which may indicate data exfiltration activity over web protocols. The rule specifically looks for HTTP POST methods and is designed for Suricata, a network intrusion detection system.
This rule detects HTTP requests made to the Shodan API (api.shodan.io). This activity is often associated with reconnaissance, where an attacker or security researcher uses Shodan to gather information about internet-connected devices and services. The rule specifically looks for the 'api.shodan.io' string within the HTTP host header, indicating an attempt to query the Shodan service.
This rule detects attempts to create new user accounts via SMB (Server Message Block) by looking for the 'NetUserAdd' function call within SMB traffic. This could indicate an attacker attempting to establish persistence or escalate privileges by creating new accounts on a target system.
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