Darshan Thummar
@MightyCompletionist
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2,107 detections
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This rule detects attempts to perform raw disk access via SSH, specifically looking for the 'dd if=/dev/sd' command within SSH traffic. This activity could indicate an attacker trying to bypass volume-based security controls or exfiltrate data directly from disk partitions.
This rule detects HTTP requests where the URI contains the string "%comspec%" (case-insensitive). This pattern is often used by attackers to obfuscate command execution, specifically by referencing the command interpreter (cmd.exe) via an environment variable, as part of defense evasion tactics. The rule is specifically looking for this string within the URI of an HTTP request flowing from the internal network to an external server.
This rule detects when an executable file is embedded within an Office document that is being downloaded over HTTP. It specifically looks for the presence of both the Office document content type indicator "[Content_Types].xml" and the "MZ" magic bytes, which signify a Windows executable, within the same file data stream. This combination is a strong indicator of a malicious Office document attempting to deliver malware.
This rule detects potential Kerberos 'Pass the Ticket' (PtT) attacks, specifically focusing on the reuse of Kerberos Ticket Granting Tickets (TGTs). It triggers when UDP traffic to port 88 (Kerberos) on the home network contains the byte sequence '|6b|' at the beginning of the payload, and this activity occurs 10 times within 5 seconds from the same source IP. The '6b' byte often indicates a Kerberos AP-REQ message, which is used to request access to a service. Repeated AP-REQ messages from the same source could indicate TGT reuse.
This rule detects network traffic where a TLS certificate is presented with an issuer's common name (CN) containing at least 8 alphanumeric characters and a subject organization (O) that includes common company suffixes like 'LLC', 'Ltd', or 'Inc'. This combination, especially with an unusually formatted issuer CN, could indicate an invalid or suspicious code signing certificate used for executables, potentially associated with trojan activity or defense evasion tactics.
This rule detects the download of a compressed executable payload over HTTP. It specifically looks for HTTP traffic flowing to the client that contains both the GZIP magic number (1F 8B) and the Windows executable magic number (MZ) within the file data. This combination suggests a compressed executable file being delivered, which is a common technique used by malware to evade detection.
This rule detects attempts to stop the Microsoft Defender Antivirus service (MsMpEng) remotely via the Server Message Block (SMB) protocol on port 445. The detection is triggered by the presence of "StopService" and "MsMpEng" (case-insensitive) within the TCP payload, indicating a potential defense evasion tactic.
This rule detects DNS queries for TXT records that contain a long, base64-encoded string, which could indicate a fileless payload being stored or retrieved via DNS. The rule specifically looks for TXT records with content matching a regular expression for base64-encoded strings of at least 80 characters.
This rule detects the creation of a new user account on a Windows system via SMB (port 445) where the account name contains 'svc_' and the 'NetUserAdd' function is used. This could indicate an attacker creating a service account with a name that mimics legitimate system accounts to evade detection.
This rule detects the creation of hidden files or directories (those prefixed with a dot) over an SSH connection. Specifically, it looks for the 'mkdir .' string within TCP traffic on port 22, indicating an attempt to create a hidden directory. This technique is often used by attackers for defense evasion to conceal malicious files or activities.
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