Darshan Thummar
@MightyCompletionist
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This rule detects network traffic indicative of AnyDesk remote desktop software being used as a command and control (C2) channel. It specifically looks for HTTP requests to 'anydesk.com' or 'relay.anydesk.com' domains. A threshold of 5 connections within 60 seconds from the same source IP is set to reduce false positives.
This rule detects potential command and control (C2) channel activity by identifying HTTP requests where the URI contains specific keywords commonly associated with C2 infrastructure switching or staging. The keywords include 'stage2', 's2', 'next', 'pivot', and 'relay'. This indicates an attacker might be moving to a new phase of their operation or redirecting C2 communications.
This rule detects potential bidirectional command and control (C2) activity leveraging Discord webhooks. It specifically looks for HTTP POST requests to 'discord.com' with the URI containing '/api/webhooks/'. A threshold of 5 such requests within 60 seconds from the same source IP is set to reduce false positives and indicate sustained communication, characteristic of C2.
This rule detects DNS queries for 'pastebin.com' that occur at a high frequency (5 times within 60 seconds from the same source IP). This pattern is indicative of a Dead Drop Resolver Command and Control (C2) mechanism, where attackers use services like Pastebin to host C2 instructions or data, and malware frequently queries these services to retrieve commands or exfiltrate data. The rule specifically targets DNS traffic on port 53.
This rule detects access to websites or services that are commonly associated with botnet rental, stresser, or DDoS-for-hire services. It specifically looks for HTTP requests where the host header contains keywords like 'booter', 'stresser', or 'ddoser' (case-insensitive). This indicates a potential policy violation where an internal user might be attempting to utilize or research such services.
This rule detects HTTP requests where the 'Host' header matches patterns commonly associated with serverless function domains, specifically AWS Lambda URLs, Azure Websites, and Google Cloud Functions. The rule is designed to identify potential command and control (C2) infrastructure utilizing serverless platforms. It triggers an alert if 10 such requests are observed from a single source IP within a 60-second window.
This rule detects HTTP traffic where the 'Host' header contains 'workers.dev'. This domain is associated with Cloudflare Workers, which can be used by attackers to deploy attack infrastructure such as command and control (C2) servers, phishing pages, or data exfiltration points. The rule is configured to trigger a threshold alert if 10 such connections are observed from a single source IP within 60 seconds, indicating potential automated activity or repeated attempts to access or deploy malicious worker scripts.
This rule detects network traffic indicative of a compromised host attempting to beacon to a botnet command and control server. Specifically, it looks for HTTP requests where the URI path contains "/gate.php". This pattern is commonly associated with botnet communication.
This rule detects Telnet access attempts to network devices within the home network. It specifically looks for TCP traffic destined for port 23 (the standard Telnet port) and triggers an alert if three such connections from the same source IP are observed within a 60-second window. This activity is flagged as a 'possible compromise' due to Telnet's insecure nature and its common use in initial access or resource development by adversaries.
This rule detects attempts to create or access disposable email accounts by monitoring HTTP traffic for specific keywords in the HTTP host header. It triggers an alert if it observes 5 instances of these keywords from the same source IP within a 60-second window. The keywords include common disposable email service domains like 'guerrillamail', 'tempmail', 'mailinator', and '10minutemail'.
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