Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects direct access to raw content hosted on various paste services. Adversaries often use these services to host malicious code (e.g., encrypted or encoded payloads) that is downloaded in subsequent stages of an attack, leveraging the services for command and control or defense evasion.
Detects HTTP requests with an empty user agent string in proxy logs. This can indicate an uncommon or potentially malicious request method, as legitimate browsers and many applications typically send a user agent. PowerShell's `(New-Object Net.WebClient).DownloadString` is one example of a tool that might generate such a request.
Detects instances where the svchost.exe process, specifically hosting the RDP terminal services, initiates outbound network connections to target systems on standard HTTP (TCP port 80) or HTTPS (TCP port 443) ports. This behavior is indicative of RDP tunneling, where RDP traffic is encapsulated within web protocols to bypass network restrictions or evade detection.
Detects potential command and control (C2) beaconing activity to domains identified as being used in the 'Operation Triangulation' attacks, which targeted iOS devices. These domains were revealed by Kaspersky and the FSB.
Detects the execution of known tunneling and exfiltration tools such as httptunnel, plink, socat, and stunnel. These tools can be abused by adversaries to establish covert communication channels, bypass network restrictions, and exfiltrate data from compromised systems.
This rule detects DNS queries for specific domains associated with the WannaCry ransomware killswitch. The presence of these queries indicates a potential WannaCry infection attempting to resolve its killswitch domain. If the domain resolves, the ransomware may cease its encryption activities.
This rule detects suspicious network requests to the Telegram API (api.telegram.org) that do not include a standard 'Telegram' or 'Bot' user-agent string. This behavior is often indicative of malware or custom tools attempting to use Telegram's API for command and control or data exfiltration without revealing their identity as a legitimate Telegram client or bot.
This rule detects HTTP requests where the User-Agent header contains ' WindowsPowerShell/'. This pattern is indicative of PowerShell making web requests, potentially for downloading files, interacting with web services, or command and control activities. This can be a legitimate administrative activity but is also frequently abused by adversaries.
Detects access patterns indicative of the DEWMODE webshell, which was used in attacks exploiting Accellion FTA. The rule looks for specific query parameters ('?dwn=', '&fn=', '.html?' or '&dwn=', '?fn=', '.html?') within the URI query string, which are characteristic of how this webshell operates.
Detects the default communication pattern used by the BabyShark C2 framework, specifically looking for the 'momyshark?key=' string within the URI of proxy requests. This pattern is indicative of BabyShark malware attempting to communicate with its command and control server.
Detects a unique URL marker '/MSHTML_C7/' used in GET requests, which has been associated with RomCom exploitation attempts, potentially leveraging CVE-2023-36884. This marker is indicative of command and control communication or initial access related to the exploit.
Detects the execution of the 'curl' command on Linux systems when it includes options to set a custom user agent. This behavior can be indicative of command and control communication or data exfiltration attempts where an adversary tries to mimic legitimate web traffic or evade detection by changing the default user agent string.
Detects potential C2 communication related to Devil Bait malware by identifying specific URI patterns in GET requests. The rule looks for URIs containing '/cross.php?op=', '&dt=', and '&uid=' which are indicative of Devil Bait's communication with its command and control server.
Detects potential beaconing activity to domains associated with the 3CXDesktopApp supply chain compromise. This rule specifically looks for DNS queries to known malicious domains identified during the compromise.
This rule detects suspicious Windows file path strings (e.g., 'C:/Users', 'C:/Windows', 'C:/Program Files') within the URI query component of web requests. The presence of such strings in a URI could indicate an attempt to exfiltrate data from a Windows system or communicate with a webshell that is attempting to access local files or directories. The rule looks for both standard and URL-encoded variations of these paths.
Detects potential beaconing activity to known malicious domains associated with the 3CXDesktopApp supply chain compromise. This rule specifically looks for connections through a proxy to a list of hardcoded domains identified as indicators of compromise (IOCs) during the 3CXDesktopApp incident.
Detects connections made by Microsoft BITSAdmin to domains using uncommon Top-Level Domains (TLDs). This can indicate command and control activity or data exfiltration where an adversary is attempting to blend in with legitimate traffic but using less common TLDs to avoid common filtering.
Detects a specific URL pattern containing a specific extension and parameters pointing to an IP address. This pattern was seen being used by RomCOM potentially exploiting CVE-2023-36884. The rule looks for GET requests where the URI contains a file extension like .zip, .asp, .htm, .url, .xml, .chm, .mht, .vbs, or .search-ms, followed by '?d=' and an IPv4 address.
Detects HTTP GET requests for specific file paths associated with the RomCom threat actor, potentially exploiting CVE-2023-36884. These file paths include various file types such as .url, .search-ms, .vbs, .mht, and .asp, which are likely used for initial access or further stages of the attack.
Detects network requests to '/pwndrop/' URI paths, which are indicative of communication with a PwnDrp web server. PwnDrp is a tool developed for red team testing and is also known to be used for malicious activities, typically for command and control or data exfiltration.
Detects suspicious child processes spawned by the "Manage Engine ServiceDesk Plus" Java web service. This often indicates successful exploitation of the application, potentially related to vulnerabilities like CVE-2022-47966. The rule looks for the execution of various system utilities and scripting interpreters commonly used by attackers for reconnaissance, privilege escalation, defense evasion, or establishing command and control.
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