Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects the first-seen external Remote Desktop Protocol (RDP) logon event for a specific user and network provider (ASN) within the last 24 hours, compared against a 14-day historical baseline. This can indicate initial access via compromised credentials or RDP exploitation.
Detects the execution of MeshAgent or mvtcs (MeshCentral) binaries, which are commonly used for legitimate remote management but can also be used as unauthorized remote access tools by adversaries.
Detects the execution of MeshAgent or mvtcs (MeshCentral) binaries, which are commonly used for legitimate remote management but can also be used as unauthorized remote access tools by adversaries.
Detects potential exploitation of CVE-2026-20127 on SD-WAN controllers, specifically unauthorized SSH authentication to the vmanage-admin account followed by suspicious NETCONF activity, usage of unauthorized tenant list CSV files, or execution of suspicious tenant-upload scripts.
Detects access to underground markets selling initial access to compromised networks
This rule detects attempts to sell or exchange VPN credentials by looking for the keywords "vpn" and "credentials" in the client body of HTTP traffic. This could indicate an attacker attempting to monetize stolen VPN access or an insider threat attempting to leak sensitive access information.
This rule detects outbound TCP connections on port 9050, which is commonly used by the Tor anonymity network. The rule is configured to trigger an alert if there are at least 3 such connections from the same source within a 60-second window, indicating potential use of Tor. The message suggests this activity is related to accessing an Initial Access Broker market.
This rule detects outbound TCP connections on port 9050, which is commonly used by the Tor anonymity network. The rule is configured to trigger an alert if there are at least 3 such connections from the same source within a 60-second window, indicating potential use of Tor. The message suggests this activity is related to accessing an Initial Access Broker market.
This rule detects outbound TCP connections on port 9050, which is commonly used by the Tor anonymity network. The rule is configured to trigger an alert if there are at least 3 such connections from the same source within a 60-second window, indicating potential use of Tor. The message suggests this activity is related to accessing an Initial Access Broker market.
This rule detects network traffic to known initial access broker (IAB) market domains. It specifically looks for HTTP requests where the host matches 'exploit.in', 'xss.is', 'raidforums', or 'breachforums' and the URI contains the word 'access'. This indicates potential activity related to purchasing or selling initial access to compromised systems.
This rule detects HTTP traffic where the client body contains the terms "rdp" and "buy" (case-insensitive). This combination suggests a potential attempt to purchase RDP access, possibly on an underground forum, which is a policy violation.
This rule detects attempts to sell or exchange VPN credentials by looking for the keywords "vpn" and "credentials" in the client body of HTTP traffic. This could indicate an attacker attempting to monetize stolen VPN access or an insider threat attempting to leak sensitive access information.
Detects network traffic to or from known IP addresses associated with TA584 command and control (C2) servers and hosting infrastructure. This actor is a known initial access broker, and infections can lead to ransomware.
Generic rule content from file: Initial Access - Probable Rogue ScreenConnect Session
KQL Query from file: Conditional Access Report
KQL Query from file: Detecting Commvault Exploitation in Azure
'This query combines different Storage alerts with CommonSecurityLogs and AuditLogs helping analysts investigate any possible storage related attacks faster
thus reducing Mean Time To Respond'
thus reducing Mean Time To Respond'
'Detects when a user has successfully authenticated to another Microsoft Entra ID tenant with an identity in your organization's tenant.
Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#monitoring-for-failed-unusual-sign-ins'
Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#monitoring-for-failed-unusual-sign-ins'
'Identifies when a user account is enabled and then disabled within 10 minutes. This can be an indication of compromise and an adversary attempting to hide in the noise.'
This query was originally published on Twitter, by @MsftSecIntel.
The query helps detect emails associated with a campaign that has used open redirector URLs. The campaign's URLs begin with the distinct pattern, hxxps://t. Attackers use URL redirection to manipulate users into visiting a malicious website or to evade detection.
Reference - https://twitter.com/MsftSecIntel
The query helps detect emails associated with a campaign that has used open redirector URLs. The campaign's URLs begin with the distinct pattern, hxxps://t. Attackers use URL redirection to manipulate users into visiting a malicious website or to evade detection.
Reference - https://twitter.com/MsftSecIntel
This query correlates Microsoft Defender for Office 365 signals and Microsoft Entra ID identity data to find the relevant endpoint event BrowerLaunchedToOpen in Microsoft Defender ATP.
This event reflects relevant clicks on the malicious URL in the spear-phishing email recognized by Microsoft Defender for Office 365.
This event reflects relevant clicks on the malicious URL in the spear-phishing email recognized by Microsoft Defender for Office 365.
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