SigmaHQ Detections
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This rule detects the usage of cleartext protocols over a network by monitoring firewall logs for allowed connections to specific destination ports commonly associated with unencrypted services. These ports include HTTP (80, 8080), FTP (21), Telnet (23), and various database or application-specific ports (e.g., 1433, 3306, 1521, 27017, 50000, 11211, 15672, 5900-5904). The rule specifically looks for 'forward' or 'accept' actions, or connections not marked as 'blocked', indicating active cleartext communication. The primary goal is to identify potential credential exposure or sensitive data transmission over insecure channels.
This rule identifies DNS queries made to domains associated with known cryptocurrency mining pools. It specifically looks for DNS queries where the 'query' field ends with any of the listed mining pool domains. The rule excludes queries with answers '127.0.0.1' or '0.0.0.0' and those marked as rejected, to reduce false positives. The primary goal is to detect potential resource hijacking through cryptomining on compromised systems.
Detects exploitation attempts targeting the VMware vCenter Server using the file upload vulnerability CVE-2021-22005. The rule specifically looks for POST requests to the '/analytics/telemetry/ph/api/hyper/send?' URI, which is indicative of an attempt to leverage this vulnerability for file upload.
This rule detects potential exploitation attempts of CVE-2021-42278, also known as "noPac" or "sAMAccountName spoofing". The exploit involves an attacker creating a computer object with known credentials, then clearing its ServicePrincipalName (SPN) attribute. This manipulation grants the attacker additional permissions on the object, allowing them to make further changes. The detection logic specifically looks for Kerberos Key Distribution Center (KDC) events (EventIDs 35, 36, 37, 38) which indicate anomalies in PAC (Privilege Attribute Certificate) or ticket requests, consistent with the post-exploitation phase of CVE-2021-42278 where forged tickets are used.
Detects child processes of 'dfsvc.exe' that are launched from the 'AppData\Local\Apps\2.0\' directory, which is indicative of a ClickOnce deployment execution. This rule aims to identify potentially malicious or unexpected ClickOnce application launches.
Detects when a role privilege is deleted in Google Workspace. This could indicate an attempt to remove or modify administrative access, potentially as part of a privilege de-escalation by an attacker to avoid detection, or to clean up after an attack.
Detects when Microsoft Cloud App Security reports an unusual volume of file deletions by a user, which could indicate malicious activity such as data destruction or ransomware.
This rule detects access to specific '.lock' and '.pid' files in the '/var/run/' directory, which are known indicators of the BPFDoor backdoor. The rule specifically looks for access to 'haldrund.pid', 'xinetd.lock', and 'kdevrund.pid'.
This rule detects the execution of the PowerShell cmdlet 'Enable-PSRemoting'. This cmdlet configures the computer to receive PowerShell remote commands, which adversaries may use for lateral movement and remote execution. Detection relies on Script Block Logging being enabled to capture the cmdlet's execution.
This rule detects PowerShell script blocks that utilize .NET's SslStream for establishing encrypted network connections. Specifically, it looks for the use of 'System.Net.Security.SslStream', 'Net.Security.RemoteCertificateValidationCallback', and '.AuthenticateAsClient' which are indicative of a client-side SSL/TLS connection being programmatically established, potentially for command and control (C2) purposes to evade detection.
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