Detections

Explore public detection logic contributed by the community across SIEM and rule languages.

4,916 detections

Detects exploitation indicators of CVE-2022-42475, a heap-based buffer overflow vulnerability in FortiOS SSL-VPN's sslvpnd daemon. The rule specifically looks for the creation of known malicious files or configuration backups in specific directories, which are artifacts of successful exploitation.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
1053
Detects potential web shell execution originating from the ScreenConnect server process. This rule specifically looks for the ScreenConnect.Service.exe spawning cmd.exe or csc.exe, which could indicate an attacker leveraging a compromised ScreenConnect server to execute arbitrary commands or compile code.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0014
Detects the execution of an AnyDesk binary with a version prior to 8.0.8.
Prior to version 8.0.8, the Anydesk application used a signing certificate that got compromised by threat actors.
Use this rule to detect instances of older versions of Anydesk using the compromised certificate
This is recommended in order to avoid attackers leveraging the certificate and signing their binaries to bypass detections.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
000
Detects potential web shell execution from the ScreenConnect server process.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
000
Detects when a user creates a Lambda function URL configuration, which could be used to expose the function to the internet and potentially allow unauthorized access to the function's IAM role for AWS API calls.
This could give an adversary access to the privileges associated with the Lambda service role that is attached to that function.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
101
Detects suspicious processes spawned from a Java host process which could indicate a sign of exploitation (e.g. log4j)
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
000
Detects the creation of a file with an ".rdp" extension by applications that are not typically expected to create such files, such as web browsers, email clients, and chat applications. This can indicate an attempt to deliver a malicious RDP file to a user, potentially leading to initial access or defense evasion.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0030
Detects POST requests to the F5 BIG-IP iControl Rest API "bash" endpoint, which allows the execution of commands on the BIG-IP. This activity can indicate an attacker exploiting a public-facing application to gain initial access and execute arbitrary commands on the F5 BIG-IP device.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
1030
Detects POST requests to the F5 BIG-IP iControl Rest API "bash" endpoint, which allows the execution of commands on the BIG-IP
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
000
Detects the creation of a specific file path commonly used in Proof-of-Concept (PoC) exploits for the Print Spooler vulnerability CVE-2021-1675, also known as PrintNightmare. This file path is typically created when an attacker successfully exploits the vulnerability to achieve remote code execution or privilege escalation.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
1038
Detects the use of a Proof-of-Concept (PoC) tool designed to exploit the Local Privilege Escalation (LPE) vulnerability CVE-2021-41379. The rule specifically looks for MsiInstaller Event ID 1033 with the data containing 'test pkg', which is indicative of the PoC's activity.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0021
Detects potential initial exploitation attempts against VMware Horizon deployments running a vulnerable version of Log4j (CVE-2021-44228). Specifically, this rule looks for process creation events where the parent process is 'ws_TomcatService.exe' and the created process is NOT 'cmd.exe' or 'powershell.exe'. This aims to catch unexpected executables launched by the vulnerable Tomcat service as a result of successful Log4j exploitation.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0041
Detects potential exploitation attempts of CVE-2022-22954, a remote code execution vulnerability in VMware Workspace ONE Access and Identity Manager. The rule specifically looks for PowerShell or cmd.exe processes being spawned as child processes of the legitimate Tomcat "prunsrv.exe" process, which was observed as part of the attack chain by Morphisec.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0031
This rule detects exploitation indicators for CVE-2023-20198, a privilege escalation vulnerability in Cisco IOS XE Software Web UI. It looks for specific log messages related to Web UI installation operations, system configuration changes, or successful web logins, in conjunction with the use of specific user accounts ('cisco_tac_admin', 'cisco_support', 'cisco_sys_manager') that are not typically created by default or used by Cisco representatives. The combination of these events suggests an attempt to exploit the vulnerability.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
1027
Detects exploitation attempts of CVE-2023-43261, an information disclosure vulnerability in Milesight UR5X, UR32L, UR32, UR35, UR41 routers before v35.3.0.7. Attackers can access sensitive router components, specifically the 'httpd.log' file, through proxy logs. This rule looks for GET requests to the '/lang/log/httpd.log' path with a successful HTTP status code (200).
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0020
Detects exploitation attempts of CVE-2023-43261, an information disclosure vulnerability in Milesight UR5X, UR32L, UR32, UR35, UR41 routers before v35.3.0.7. This vulnerability allows attackers to access sensitive router components by requesting the '/lang/log/httpd.log' file, which can contain passwords and other critical information.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0020
This rule detects file activity indicative of potential exploitation of the MOVEit Transfer CVE-2023-34362 vulnerability. It specifically looks for the creation or modification of suspicious file types (like .7z, .bat, .dll, .exe, .ps1, .rar, .vbe, .vbs, .zip) within the MOVEit Transfer webroot directory. Additionally, it identifies the presence of known malicious files such as `_human2.aspx` or `human2.aspx` and their shortcut files (`.lnk`) within the same directory. The rule also includes a selection for newly compiled ASP.NET DLLs within the temporary ASP.NET files directory, created around the time the vulnerability was actively exploited (March-June 2023), which could indicate the deployment of web shells or other malicious code.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0025
Detects changes to the security group entries for AWS RDS databases. This can indicate a misconfiguration that potentially exposes the database to the public internet, a wider audience within the VPC, or the removal of valid rules which could impact database availability for legitimate services and users. The rule specifically looks for API calls related to authorizing, creating, deleting, or revoking database security group ingress rules.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
0063
Detects suspicious error messages from the OpenSSH daemon that may indicate an attempted exploit or a fatal error during an SSH connection attempt. These errors could be triggered by malformed requests or unusual client behavior designed to uncover vulnerabilities or bypass authentication.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
1063
This rule detects suspicious user agent strings commonly used by various hacking tools, including vulnerability scanners, brute-force tools, and SQL injection tools, within proxy logs. The rule identifies specific strings indicative of tools like Arachni, Hydra, DirBuster, SQLMap, and others, which are often employed during reconnaissance, initial access, and credential access phases of an attack.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
4060
Detects exploitation attempts on Cisco ASA FTD systems exploiting CVE-2020-3452. The rule specifically looks for HTTP requests containing URI query strings indicative of the vulnerability, combined with a successful HTTP status code (200), suggesting a successful exploitation or at least a successful attempt to trigger the vulnerable endpoint.
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SigmaHQ Detections@sigmaHQ
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SigmaHQ
2 years ago
14059
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