Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects alerts that reference specific CVEs historically exploited by the threat group QTFY against internet-facing applications, including common vulnerabilities in Pulse Secure, FortiOS, Citrix ADC, Exchange, F5 BIG-IP, Log4Shell, and others, when the alert severity is Medium or High and contains indicators of exploit or initial access.
Detects anomalous child process execution (e.g., cmd.exe, powershell.exe) by the Microsoft Exchange IIS worker process (w3wp.exe) or the creation of .aspx files in Exchange web directories. This behavior is highly indicative of post-exploitation activity, such as web shell deployment, frequently observed in attacks targeting vulnerabilities like ProxyShell and ProxyLogon.
Detects incoming HTTP requests to Microsoft Exchange servers that match patterns indicative of exploitation attempts for the ProxyLogon SSRF vulnerability (CVE-2021-26855). This includes detecting specific manipulation of the Autodiscover service and the injection of X-BEResource or X-AnonResource-Backend headers, which were commonly used during the initial access phase of this campaign.
Detects alerts that reference specific CVEs historically exploited by the threat group QTFY against internet-facing applications, including common vulnerabilities in Pulse Secure, FortiOS, Citrix ADC, Exchange, F5 BIG-IP, Log4Shell, and others, when the alert severity is Medium or High and contains indicators of exploit or initial access.
This rule detects inbound HTTP requests targeting Microsoft Exchange Server that contain the specific headers and patterns associated with the ProxyLogon (CVE-2021-26855) Server-Side Request Forgery (SSRF) vulnerability. It specifically monitors for the presence of the 'X-BEResource' header and malformed request structures used by attackers to bypass authentication.
Detects instances where the IIS worker process (w3wp.exe) spawns common command-line or system utilities often used for post-exploitation activities, specifically when command-line arguments contain references to 'MSExchange' or 'Exchange'. This behavior is frequently associated with exploitation attempts against Microsoft Exchange servers, such as the ProxyLogon chain, where a web shell or other malicious script might be used to execute commands via the IIS process.
Detects anomalous child processes spawned by the Microsoft Exchange IIS worker process (w3wp.exe). This activity is often observed during post-exploitation phases of vulnerabilities like ProxyLogon (CVE-2021-26855), where attackers attempt to gain code execution by spawning command shells or administrative tools from the web server process.
Detects incoming HTTP requests to Microsoft Exchange servers that match patterns indicative of exploitation attempts for the ProxyLogon SSRF vulnerability (CVE-2021-26855). This includes detecting specific manipulation of the Autodiscover service and the injection of X-BEResource or X-AnonResource-Backend headers, which were commonly used during the initial access phase of this campaign.
Detects the spawning of suspicious processes like cmd, powershell, or certutil by the Exchange Server's web worker process (w3wp.exe), which is a common indicator of post-exploitation activity following an initial web vulnerability exploitation, such as ProxyLogon.
Detects incoming HTTP requests to Microsoft Exchange servers that match patterns indicative of exploitation attempts for the ProxyLogon SSRF vulnerability (CVE-2021-26855). This includes detecting specific manipulation of the Autodiscover service and the injection of X-BEResource or X-AnonResource-Backend headers, which were commonly used during the initial access phase of this campaign.
Detects alerts that reference specific CVEs historically exploited by the threat group QTFY against internet-facing applications, including common vulnerabilities in Pulse Secure, FortiOS, Citrix ADC, Exchange, F5 BIG-IP, Log4Shell, and others, when the alert severity is Medium or High and contains indicators of exploit or initial access.
Detects alerts that reference specific CVEs historically exploited by the threat group QTFY against internet-facing applications, including common vulnerabilities in Pulse Secure, FortiOS, Citrix ADC, Exchange, F5 BIG-IP, Log4Shell, and others, when the alert severity is Medium or High and contains indicators of exploit or initial access.
Detects alerts that reference specific CVEs historically exploited by the threat group QTFY against internet-facing applications, including common vulnerabilities in Pulse Secure, FortiOS, Citrix ADC, Exchange, F5 BIG-IP, Log4Shell, and others, when the alert severity is Medium or High and contains indicators of exploit or initial access.
Detects alerts that reference specific CVEs historically exploited by the threat group QTFY against internet-facing applications, including common vulnerabilities in Pulse Secure, FortiOS, Citrix ADC, Exchange, F5 BIG-IP, Log4Shell, and others, when the alert severity is Medium or High and contains indicators of exploit or initial access.
Detects Server-Side Request Forgery (SSRF) attempts targeting Microsoft Exchange via the /autodiscover/ endpoint. The attack leverages a specifically crafted X-BEResource header containing an internal IP address, which is indicative of the CVE-2021-26855 vulnerability used in ProxyLogon exploitation.
Detects incoming HTTP requests to Microsoft Exchange servers containing malicious X-AnonResource-Backend or X-BEResource headers, which are indicative of an attempt to exploit the ProxyLogon SSRF vulnerability (CVE-2021-26855).
Detects incoming HTTP requests to Microsoft Exchange servers containing malicious X-AnonResource-Backend or X-BEResource headers, which are indicative of an attempt to exploit the ProxyLogon SSRF vulnerability (CVE-2021-26855).
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 Server-Side Request Forgery (SSRF) attempts targeting Microsoft Exchange via the /autodiscover/ endpoint. The attack leverages a specifically crafted X-BEResource header containing an internal IP address, which is indicative of the CVE-2021-26855 vulnerability used in ProxyLogon exploitation.
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