Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects HTTP requests targeting Microsoft Exchange servers that combine the autodiscover.json URI with PowerShell endpoint parameters, indicative of ProxyNotShell vulnerabilities exploitation (CVE-2022-41040 and CVE-2022-41082).
This rule detects post-exploitation activity on Microsoft Exchange Servers by monitoring for w3wp.exe (IIS worker process) spawning command-line interpreters such as cmd.exe, powershell.exe, or pwsh.exe. This behavior is indicative of an attacker leveraging a web shell, often deployed via the exploitation of vulnerabilities like ProxyLogon (CVE-2021-26855), ProxyNotShell (CVE-2022-41082), or similar remote code execution flaws targeting Exchange endpoints.
Detects the creation of web-executable files (e.g., .aspx, .ashx, .php, .jsp, .asmx) within sensitive web root directories (IIS, Exchange, SharePoint) when the writing process is identified as an IIS worker process (w3wp.exe) or an Exchange Unified Messaging worker process (UMWorkerProcess.exe). This activity is highly indicative of web shell deployment for post-exploitation persistence, commonly associated with vulnerabilities like CVE-2021-26855 or CVE-2022-41082.
Detects anomalous child process creation from typical web and application server processes (IIS w3wp.exe or Openfire Java processes). This behavior is consistent with post-exploitation activity following web application vulnerability exploitation, specifically web shell deployment and execution of reconnaissance or secondary payload staging commands.
Detects instances where the Exchange Server IIS worker process (w3wp.exe) spawns unexpected child processes like PowerShell, pwsh, or cmd, often indicating exploitation of vulnerabilities such as ProxyNotShell (CVE-2022-41040 and CVE-2022-41082) where an attacker leverages Exchange backend processes for arbitrary command execution.
Detection rule generated by AI system
This rule detects process executions that exhibit patterns commonly associated with China Chopper-like tiny webshells, specifically when they are spawned by the w3wp.exe process (IIS worker process). The detection logic looks for specific command-line arguments that include common discovery and system information commands such as 'ipconfig', 'quser', 'whoami', 'c:', 'cd', 'dir', and echo commands, often used by webshells to interact with the compromised system.
Detects patterns found in process executions cause by China Chopper like tiny (ASPX) webshells
Detects exploitation attempts of the OWASSRF variant targeting Exchange servers. This variant uses the OWA endpoint to access the PowerShell backend endpoint, indicated by specific URI patterns and HTTP methods. The rule filters out common legitimate user agents to reduce false positives.
Detects exploitation attempts of the OWASSRF vulnerability targeting Microsoft Exchange servers using publicly available Proof-of-Concept (POC) code. This exploit leverages the Outlook Web Access (OWA) endpoint to gain access to the PowerShell backend endpoint, indicated by specific URI patterns, HTTP method, user-agent, and a successful HTTP status code.
Detects exploitation attempts of the OWASSRF vulnerability targeting Microsoft Exchange servers using publicly available Proof-of-Concept (POC) code. This rule specifically looks for requests to the OWA endpoint attempting to access the PowerShell backend endpoint, characterized by a specific user agent, POST method, successful status code (200), and URI query containing both '/owa/mastermailbox' and '/powershell'. This indicates an attempt to leverage the vulnerability for remote code execution.
Detects exploitation attempts of the OWASSRF variant targeting Exchange servers. This exploit leverages the OWA endpoint to access the PowerShell backend endpoint, often associated with CVE-2022-41080 and CVE-2022-41082.
Detects suspicious file types (such as web shells, scripts, or executables) being dropped by the IIS worker process (w3wp.exe) associated with Microsoft Exchange. This behavior is indicative of successful exploitation of Exchange vulnerabilities, often leading to the deployment of web shells for persistent access.
Detects the creation of suspicious web shell files (ASPX, ASP, ASHX) by the IIS worker process (w3wp.exe) in directories commonly associated with Microsoft Exchange or IIS web roots. This activity is indicative of potential exploitation of Exchange vulnerabilities, such as those used in the ProxyShell or ProxyNotShell attacks, to establish persistence via web shells.
Detects suspicious file type dropped by an Exchange component in IIS
Detects suspicious file type dropped by an Exchange component in IIS into a suspicious folder