Darshan Thummar
@MightyCompletionist
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This rule detects the delivery of a token manipulation tool over HTTP. It specifically looks for the presence of the strings "AdjustTokenPrivileges" and "OpenProcessToken" (case-insensitive) within the file data of an HTTP response. These strings are associated with Windows API calls used for modifying process tokens, which is a common technique for privilege escalation.
This rule detects suspicious activity related to Microsoft Teams chat messages being scraped for credentials. Specifically, it looks for HTTP requests to 'graph.microsoft.com' with URIs containing '/chats/' and '/messages'. A threshold of 20 such requests within 60 seconds from a single source IP triggers the alert, indicating potential automated data exfiltration or credential harvesting from Teams chats.
This rule detects attempts to copy the Active Directory Certificate Services (ADCS) certificate database for offline forgery. Specifically, it looks for SMB traffic to a server on port 445 (SMB) containing the string "certnew.cer" (case-insensitive) in the content, indicating a file transfer of a newly issued certificate. This activity is often associated with credential access techniques, where an attacker might exfiltrate certificate data to forge credentials.
This rule detects attempts to perform process injection using the 'ptrace' system call, specifically looking for 'ptrace' and 'PTRACE_ATTACH' within TCP traffic destined for SSH (port 22). This activity is indicative of an attacker trying to attach to a running process, often for debugging, modifying its memory, or injecting malicious code, potentially after gaining remote access via SSH.
This rule detects attempts to abuse Active Directory Certificate Services (AD CS) by requesting certificates through the /certsrv/ interface. Specifically, it looks for HTTP requests containing both '/certsrv/' and 'request' in the URI, indicating a certificate enrollment request. The thresholding mechanism (5 requests from the same source within 60 seconds) aims to reduce false positives and highlight potentially automated or repeated attempts to exploit AD CS.
This rule detects a potential MFA SMS code request flooding attack. It triggers when a single source IP address makes 10 or more HTTP requests containing the string "send_code" in the URI within a 60-second window. This behavior is indicative of an attacker repeatedly attempting to request MFA codes, likely in an attempt to overwhelm the user or the system, or to facilitate a SIM-swapping attack.
This rule detects potential unauthorized access attempts using forged web credentials. It specifically looks for HTTP requests containing a cookie with a long, base64-like encoded string (100 or more characters) which could indicate a forged session token or credential. A threshold of 10 such occurrences within 5 seconds from the same destination IP address triggers the alert, suggesting a brute-force or automated credential stuffing attempt.
This rule detects the use of a Silver Ticket for SMB service authentication. A Silver Ticket is a forged Kerberos service ticket that allows an attacker to authenticate to a specific service (like SMB) on a specific server without needing to interact with the Domain Controller. The rule looks for TCP traffic on port 445 (SMB) containing both 'NTLMSSP' and 'KRB5' content, indicating a Kerberos authentication attempt that might be a Silver Ticket. A threshold is applied to prevent excessive alerts.
This rule detects a Silver Ticket attack, specifically looking for forged Kerberos service tickets. It inspects UDP traffic on port 88 (Kerberos) for specific byte sequences indicative of a forged ticket. The content '|6b|' at depth 1 and '|a0 03 02 01 05|' are specific patterns associated with the structure of a Kerberos ticket, which when combined, suggest a malicious attempt to authenticate to a service without proper credentials.
This rule detects a rogue DHCP server offer on the network. It specifically looks for UDP traffic on port 67 (DHCP server port) to the home network, containing the DHCP message type '02' (DHCP Offer) at the beginning of the payload. A threshold is set to trigger an alert if 3 such offers are detected from the same source within 10 seconds, indicating a potentially malicious or misconfigured DHCP server attempting to assign IP addresses.
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