Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule monitors for unauthorized deletion or modification of Microsoft Sentinel alert rules and automation rules. Such actions are indicative of an attacker attempting to impair security monitoring, silence alerts, or disable automated responses to maintain persistence and evade detection.
Detects unauthorized or non-standard attempts to replicate directory data from a Domain Controller, specifically looking for Directory Replication Service (DRS) GetChanges and GetChangesAll access requests. This behavior is indicative of a DCSync attack, often used by adversaries to dump credentials from the NTDS.dit database.
Detects access to sensitive Domain DNS objects in Active Directory, specifically targeting properties associated with domain controller replication metadata or sensitive object attributes. This activity is often used for reconnaissance or to facilitate further attacks against domain infrastructure.
Detects specific object access (EventID 4662) targeting sensitive Active Directory objects, including Domain Admin, Enterprise Admin, or other high-value security principal containers. These GUIDs are associated with common Active Directory enumeration or exploitation techniques used to identify critical infrastructure or perform reconnaissance.
Detects when a user or machine account is added to a highly privileged Active Directory group. This event is often a sign of privilege escalation or persistence establishment by an adversary.
This rule detects unauthorized modifications to sensitive Group Policy Object (GPO) attributes, such as file system paths, version numbers, or extension settings. It monitors Security Event 5136 for changes targeting GPO containers by non-standard administrative accounts, flagging potential attempts to persist access or escalate privileges via GPO tampering.
This rule detects the modification of the SID History attribute on Active Directory accounts (Event ID 4765) or failed attempts to do so (Event ID 4766). The SID History attribute can be abused to gain unauthorized access and escalate privileges across domain boundaries by injecting well-known or administrative SIDs, a technique known as SID-History Injection.
Detects when a user or machine account is added to a highly privileged Active Directory group. This event is often a sign of privilege escalation or persistence establishment by an adversary.
This rule detects unauthorized modifications to sensitive Group Policy Object (GPO) attributes, such as file system paths, version numbers, or extension settings. It monitors Security Event 5136 for changes targeting GPO containers by non-standard administrative accounts, flagging potential attempts to persist access or escalate privileges via GPO tampering.
This rule detects the creation of a new domain user account followed by its immediate addition to a privileged Active Directory group within a short timeframe. It specifically ignores common provisioning accounts and service accounts. A high risk score is assigned if the privileged group assignment occurs within 5 minutes of account creation, flagging potentially malicious account takeovers or privilege escalation activity.
Detects when a single user initiates a high volume (5 or more) of external guest user invitations within a one-hour window. This behavior can be indicative of reconnaissance or attempts to establish persistence by an compromised account by inviting external identities into the tenant.
Detects successful OAuth application consent events where the requested permissions include sensitive scopes such as Mail, Files, or User profile access. This is a common indicator of OAuth application-based phishing or persistence attempts, often referred to as 'Illicit Consent Grant' attacks.
This rule detects when sensitive administrative roles are assigned directly to users in Microsoft Entra ID (formerly Azure AD) without utilizing the Privileged Identity Management (PIM) service. Direct assignment of these roles bypasses the security controls and JIT (Just-In-Time) access workflows enforced by PIM, potentially indicating unauthorized privilege escalation or a misconfiguration.
This rule detects unauthorized or suspicious modifications to Microsoft Sentinel alert rules. It specifically monitors for the deletion of alert rules or the disabling of existing rules via the Azure activity logs. Such actions may indicate an attempt by an adversary to impair security monitoring and defensive capabilities.
Detects the creation or modification of inbox rules in Exchange/Office 365 that both apply an email suppression action (move to folder, delete, or mark as read) and filter for security-themed keywords (e.g., 'phish', 'MFA', 'SOC'). This behavior is commonly used by adversaries to hide security alerts, multi-factor authentication (MFA) prompts, or phishing incident notifications from a compromised user's mailbox.
Detects instances where a guest user is invited to the organization using an email address from potentially malicious TLDs (e.g., .ru, .cn, .ir, .kp) or a domain structure that is represented as an IP address. These patterns are often associated with phishing, reconnaissance, or adversary attempts to gain a foothold in an environment by inviting external identities.
Detects the creation or modification of inbox rules in Exchange/Office 365 that both apply an email suppression action (move to folder, delete, or mark as read) and filter for security-themed keywords (e.g., 'phish', 'MFA', 'SOC'). This behavior is commonly used by adversaries to hide security alerts, multi-factor authentication (MFA) prompts, or phishing incident notifications from a compromised user's mailbox.
Detects any modification (add, update, or delete) to Entra ID cross-tenant access settings. Adversaries may manipulate these trust configurations to weaken inbound security restrictions, establish unauthorized access between tenants, or facilitate cross-tenant impersonation.
Detects modifications or publication of Azure Automation runbooks by users or service principals other than known, pre-approved automation service principals. This activity may indicate an unauthorized user or compromised service principal attempting to inject malicious code into automation workflows.
Detects anomalous, high-frequency account enumeration activity in cloud audit logs, specifically targeting user, group, device, and service principal listing operations. This behavior is indicative of potential reconnaissance or discovery efforts by an attacker who has compromised a user account.
This rule monitors for administrative VMware operations (cloning, snapshotting, or process manipulation) performed on sensitive infrastructure servers (such as Domain Controllers, PKI, Vault, or ADFS) that occur outside of a designated maintenance window by non-authorized accounts. It leverages tools like vim-cmd, esxcli, or govc to detect potential unauthorized VM manipulation that could lead to data theft, snapshot-based credential extraction, or unauthorized system changes.
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