Darshan Thummar
@MightyCompletionist
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2,107 detections
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This rule detects network topology discovery attempts via ICMP host sweeps. It triggers an alert when a source IP sends 50 or more ICMP echo requests (type 8) within a 10-second window to the local network. This behavior is indicative of an attacker trying to identify active hosts on a network.
This rule detects DNS queries for Mail Exchanger (MX) records. A high volume of MX record lookups from a single source IP address within a short timeframe (10 queries in 30 seconds) is indicative of network scanning activity, specifically reconnaissance to discover mail servers. This could be a precursor to targeted attacks like phishing or email spoofing.
This rule detects a DNS incremental zone transfer request. This type of request is used to synchronize DNS zone data between DNS servers. While legitimate in some network configurations, it can also be abused by attackers during reconnaissance to gather information about a network's internal structure.
Exposed Git Repository Discovery
Suricata
This rule detects attempts to discover exposed Git repositories on a web server. It triggers when an HTTP request URI contains the string "/.git/", indicating a client is probing for the presence of a Git repository's internal structure. This is a common reconnaissance technique used by attackers to find sensitive information or source code.
WHOIS Database API Bulk Query
Suricata
This rule detects HTTP requests to known WHOIS database API services (whoisxmlapi.com, whoisfreaks.com, whoapi.com). Such activity could indicate an attempt to perform bulk reconnaissance on domains or IP addresses, potentially for malicious purposes like phishing, infrastructure mapping, or identifying targets.
This rule detects the presence of the Acunetix Web Vulnerability Scanner based on its unique User-Agent string in HTTP traffic. It specifically looks for the case-insensitive string "acunetix" within the HTTP User-Agent header in traffic flowing from the internal network to an external server.
This rule detects the download of remote support tools such as AnyDesk, TeamViewer, Atera, Splashtop, and ConnectWise. The detection is based on HTTP URI patterns that match these tool names. This activity is often associated with phone scams where attackers trick users into installing remote access software, giving the attackers control over their systems.
This rule detects potential reverse proxy phishing pages by looking for HTTP URI requests that contain the keywords 'verify', 'account', and 'secure' (case-insensitive). The presence of these keywords in the URI of an HTTP request, particularly when combined, can indicate an attempt to mimic legitimate login or account verification pages, often used in phishing attacks.
This rule detects phishing emails sent over SMTP that contain macro-enabled documents (Word or Excel files) as attachments. It specifically looks for base64 encoded content, the 'filename=' attribute, and uses a PCRE to identify common macro-enabled file extensions like .doc, .docx, .xls, .xlsm, and .xlsb within the filename.
This rule detects HTTP traffic where the URI contains common URL shortener domains (bit.ly, tinyurl, t.co, ow.ly, is.gd) and also contains the string "login" (case-insensitive). This combination is often indicative of phishing attempts that use URL shorteners to obscure malicious links, leading users to fake login pages.
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