SigmaHQ Detections
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6,800 detections
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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.
This rule detects potential exploitation of CVE-2023-21554, dubbed 'QueueJumper'. The vulnerability allows for unauthorized remote code execution within the MSMQ service. The rule specifically looks for the 'mqsvc.exe' process (Microsoft Message Queuing service) spawning common Windows command-line interpreters or scripting engines, which would indicate an attempt to execute arbitrary code.
Detects Microsoft Outlook attempting to initiate a connection to a WebDAV or SMB share by querying specific registry keys. This behavior is indicative of an exploitation attempt related to CVE-2023-23397, where an attacker could force Outlook to connect to a malicious share and leak NTLM hashes.
Detects the execution of rundll32.exe with a command line that specifically loads a DLL named "1.dll" and calls the "DllRegisterServer" export function. This pattern has been observed in malware campaigns, particularly those involving IcedID.
Detects the execution of 'rundll32.exe' where the loaded DLL does not have a '.dll' extension, often observed in Qakbot activity. The rule specifically looks for 'rundll32.exe' being spawned by common scripting or command-line interpreters and for the command line to contain paths frequently used by Qakbot for its payloads.
This rule detects the execution of specific binaries identified as being used by the UNC4841 threat group to deploy the SEASPY backdoor. The binaries include 'BarracudaMailService', 'resize2fstab', and 'resize_reisertab'. Detection is based on the image path ending with any of these specific names.
Detects Dllhost.EXE initiating an outbound network connection to a non-local IP address. Dllhost.exe is a legitimate Windows process that hosts DLL-based COM+ applications. While legitimate network communication from Dllhost.exe can occur, especially for applications it hosts, unexpected connections to external IP addresses (excluding known Microsoft ranges and local networks) can indicate malicious activity. Adversaries may abuse Dllhost.exe for proxy execution or to establish command and control.
Detects the execution of the `attrib.exe` utility with the `+s` flag, which is used to mark files as system files. This technique can be used by adversaries to hide malicious files from users and some security tools, contributing to defense evasion.
This rule detects potential local file read vulnerabilities in JVM-based applications by looking for specific keywords in application error logs. It triggers when a 'FileNotFoundException' occurs in conjunction with path traversal payloads like '/../../..'. This combination suggests an attacker is attempting to read arbitrary files from the system by manipulating input paths, which could lead to sensitive information disclosure.
This rule detects when a user or entity makes changes to Amazon S3 bucket data management configurations. This includes modifications to logging, website hosting, encryption, lifecycle policies, replication configurations, and object restoration. Such changes could indicate an attempt to tamper with data integrity, availability, or exfiltration mechanisms within S3.
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