Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
746 detections
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Detects pre-encryption behaviors where an adversary or script stops or disables multiple critical services (such as backup solutions, databases, and security software) using standard Windows utilities (sc.exe, net.exe, taskkill.exe, powershell.exe) in a short timeframe, commonly observed prior to ransomware deployment.
Detects the loading of known vulnerable drivers (often used in Bring Your Own Vulnerable Driver attacks) or drivers loaded from user-writable paths outside of trusted directories.
Detects execution of Defendnot installation via PowerShell one-liner that downloads and executes the Defendnot script from a remote URL.
Defendnot is a hacktool that abuses Microsoft's undocumented WSC API to disable Windows Defender by registering itself as a fake antivirus product.
Defendnot is a hacktool that abuses Microsoft's undocumented WSC API to disable Windows Defender by registering itself as a fake antivirus product.
Detects the execution of the hacktool Defendnot. Defendnot is a hacktool that abuses Microsoft undocumented WSC (Windows Security Center) API
to disable Windows Defender by registering itself as a fake antivirus product. Threat actors often use these kind of tools to bypass security measures.
to disable Windows Defender by registering itself as a fake antivirus product. Threat actors often use these kind of tools to bypass security measures.
Detects attempts to tamper with Microsoft Defender services, features, configurations, exclusions, and policy registry keys over a 30-minute aggregation window per device. High-confidence events include stopping Defender services or disabling real-time protection via commands or tampering events, while multiple lower-confidence events (such as adding exclusions or disabling cloud protection) combined together also trigger an alert.
Detects Java processes spawning PowerShell or Command Prompt to modify Windows Defender settings by adding exclusions for sensitive paths or extensions (such as AppData, Temp, Users Public, or ProgramData).
Detects the usage of binaries such as 'net', 'sc' or 'powershell' in order to stop, pause, disable or delete critical or important Windows services such as AV, Backup, etc. As seen being used in some ransomware scripts
Detects the default scheduled task activity of the hacktool Defendnot, which is used to disable Windows Defender Security.
It abuses Microsoft's undocumented WSC API to register itself as a fake antivirus product, allowing it to disable Windows Defender.
During installation, Defendnot creates a scheduled task named 'defendnot' with the argument '--from-autorun' for persistence.
It abuses Microsoft's undocumented WSC API to register itself as a fake antivirus product, allowing it to disable Windows Defender.
During installation, Defendnot creates a scheduled task named 'defendnot' with the argument '--from-autorun' for persistence.
Detects various anti-forensic and defensive evasion techniques on Linux systems, including clearing system and shell logs, bash/zsh history deletion or disabling, file timestomping via touch, and termination or tampering of security agents such as Cortex, Falcon, or Wazuh.
Detects modification of the Microsoft Security Center AV registry keys, particularly those related with DisplayName, ProductEXE, or ReportingExe.
These keys typically store information about antivirus products installed on the system, which is Windows Defender or third-party antivirus software.
But, if these keys holds unexpected values or are modified in a suspicious manner, it could indicate an attempt to tamper with the security settings of the system.
These keys typically store information about antivirus products installed on the system, which is Windows Defender or third-party antivirus software.
But, if these keys holds unexpected values or are modified in a suspicious manner, it could indicate an attempt to tamper with the security settings of the system.
Detects command line activity that tries to clear or disable any ETW trace log which could be a sign of logging evasion.
The following analytic detects modifications to the Windows registry aimed at disabling the Registry Editor (regedit). It leverages data from the Endpoint.Registry data model, specifically monitoring changes to the registry path "*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\DisableRegistryTools" with a value of "0x00000001". This activity is significant because malware, such as RATs or trojans, often disable registry tools to prevent the removal of their entries, aiding in persistence and defense evasion. If confirmed malicious, this could hinder incident response efforts and allow the attacker to maintain control over the compromised system.
The following analytic detects the use of `dism.exe` to remove Windows Defender. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on command-line executions that include specific parameters for disabling and removing Windows Defender. This activity is significant because adversaries may disable Defender to evade detection and carry out further malicious actions undetected. If confirmed malicious, this could lead to the attacker gaining persistent access, executing additional payloads, or exfiltrating sensitive data without being intercepted by Windows Defender.
Detects when an SAP audit message ID appears in security audit logs but is absent from the defined monitoring configuration table, which could indicate attempts to bypass or disable monitoring controls.
Detects usage of powershell cmdlets to disable or remove ETW trace sessions
The following analytic detects attempts to stop security-related services on an endpoint, which may indicate malicious activity. It leverages data from Endpoint Detection and Response (EDR) agents, specifically searching for processes involving the "sc.exe" or "net.exe" command with the "stop" parameter or the PowerShell "Stop-Service" cmdlet. This activity is significant because disabling security services can undermine the organization's security posture, potentially leading to unauthorized access, data exfiltration, or further attacks like malware installation or privilege escalation. If confirmed malicious, this behavior could compromise the endpoint and the entire network, necessitating immediate investigation and response.
The following analytic detects the modification of the Windows Registry key "DisableAntiSpyware" being set to disable. This detection leverages data from the Endpoint.Registry datamodel, specifically looking for the registry value name "DisableAntiSpyware" with a value of "0x00000001". This activity is significant as it is commonly associated with Ryuk ransomware infections, indicating potential malicious intent to disable Windows Defender. If confirmed malicious, this action could allow attackers to disable critical security defenses, facilitating further malicious activities such as data encryption, exfiltration, or additional system compromise.
The following analytic detects a registry modification that disables the ETW for the .NET Framework.
It leverages data from the Endpoint.Registry data model, specifically monitoring changes to the COMPlus_ETWEnabled registry value under the "Environment" registry key path for both user (HKCU\Environment) and machine (HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment) scopes.
This activity is significant because disabling ETW can allow attackers to evade Endpoint Detection and Response (EDR) tools and hide their execution from audit logs.
If confirmed malicious, this action could enable attackers to operate undetected, potentially leading to further compromise and persistent access within the environment.
It leverages data from the Endpoint.Registry data model, specifically monitoring changes to the COMPlus_ETWEnabled registry value under the "Environment" registry key path for both user (HKCU\Environment) and machine (HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment) scopes.
This activity is significant because disabling ETW can allow attackers to evade Endpoint Detection and Response (EDR) tools and hide their execution from audit logs.
If confirmed malicious, this action could enable attackers to operate undetected, potentially leading to further compromise and persistent access within the environment.
This rule detects modifications to the 'HideExclusionsFromLocalAdmins' registry key within the Windows Defender policy configuration. An adversary may modify this key to hide configured security exclusions from local administrators, facilitating defense evasion. The rule specifically looks for non-system process attempts to modify this key, contrasting against expected legitimate updates performed by 'gpsvc' (Group Policy Service).
The following analytic detects modifications to the registry that disable the Event Tracing for Windows (ETW) feature. It leverages data from the Endpoint.Registry data model, specifically monitoring changes to the registry path "*\\SOFTWARE\\Microsoft\\.NETFramework\\ETWEnabled" with a value set to "0x00000000". This activity is significant because disabling ETW can allow attackers to evade detection mechanisms, making it harder for security tools to monitor malicious activities. If confirmed malicious, this could enable attackers to execute payloads with minimal alerts, impairing defenses and potentially leading to further compromise of the system.
The following analytic identifies modifications in the registry to disable Windows Defender's real-time behavior monitoring. It leverages data from the Endpoint.Registry data model, specifically monitoring changes to registry paths associated with Windows Defender settings. This activity is significant because disabling real-time protection is a common tactic used by malware such as RATs, bots, or Trojans to evade detection. If confirmed malicious, this action could allow an attacker to execute code, escalate privileges, or persist in the environment without being detected by antivirus software.
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