Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects instances where a user account performs non-interactive or legacy authentication (e.g., IMAP, POP3, SMTP, ActiveSync) shortly after an endpoint associated with that same user is flagged for malware or infostealer activity. This pattern is indicative of an adversary using exfiltrated credentials to maintain access to cloud services while bypassing MFA policies.
Detects a sequence of events where a user account triggers a high-risk or anomalous sign-in (e.g., token-replay, AitM, impossible travel), followed within 12 hours by that same user modifying, deleting, or narrowing the scope of Conditional Access or identity security policies. This behavior is indicative of an attacker attempting to establish persistence, strip MFA requirements, or bypass location restrictions after gaining initial cloud account access.
Detects the assignment of a highly privileged administrative or directory role to a user or service principal following a high-risk or anomalous sign-in event. This pattern is indicative of potential session hijacking where an adversary attempts to escalate privileges within a cloud environment after gaining initial access to a compromised account.
Detects bulk mailbox export or content search operations performed by an identity shortly after a high-risk sign-in event. This pattern is indicative of potential account takeover where an adversary attempts to harvest sensitive email data at scale for BEC or extortion.
Detects when a user account that has exhibited anomalous or risky sign-in behavior subsequently grants mailbox delegation, full-access, or Send-As permissions to another user (who is not the mailbox owner). This activity is indicative of a compromised account being used to establish persistence or facilitate email exfiltration and spoofing by expanding access to sensitive mailboxes.
Detects a single user identity authenticating into three or more distinct SaaS applications within a 10-minute window. This behavior is consistent with the replay of a stolen session cookie (Pass-the-Cookie) or the abuse of an active authenticated session to move laterally across a federated SaaS estate.
Detects an anomalous volume of file access or synchronization activity on cloud document platforms (Microsoft SharePoint, OneDrive, or Google Drive) that occurs following a high-severity risky sign-in event. The rule specifically flags potential exfiltration patterns such as large volumes of data transfer or numerous file accesses, especially if associated with unmanaged devices or connections to known personal/external file-sharing services.
This rule detects anomalous Privileged Identity Management (PIM) or Just-in-Time (JIT) role activation events. It identifies when a user activates a privileged role following suspicious activity such as a risky sign-in, during unusual (off-hours) time windows, or from an unfamiliar source IP address, potentially indicating session hijacking or credential abuse.
Detects sign-in events to high-privileged cloud management consoles (e.g., Azure Portal, Microsoft Entra, Intune, Okta, AWS, GCP) originating from sessions with elevated risk or anomalous characteristics. The detection monitors for factors such as the use of anonymized IP addresses, unmanaged devices, sessions marked as 'atRisk' by identity providers, or non-interactive service-based access to management APIs that deviate from standard administrative workflow patterns.
Detects 'Add member to role' operations in Entra ID where high-privileged directory roles are assigned to a user or service principal. This pattern is often a critical indicator of privilege escalation in account compromise scenarios where an attacker attempts to elevate their own or a secondary account's permissions within the tenant.
Detects the creation of anonymous or guest-access sharing links for SharePoint items that are classified as sensitive (having a sensitivity label applied). This activity could indicate potential data exfiltration or unauthorized sharing of protected corporate information.
Detects high-volume mailbox item access (MailItemsAccessed) within 15-minute intervals, correlated with risky Entra ID sign-in events within a 60-minute window. This behavior is indicative of automated mail reconnaissance or data exfiltration following potential cloud account compromise.
Detects the granting of high-risk OAuth application scopes (e.g., Mail.Read, offline_access) within two hours of a risky sign-in event for the same user. This pattern is indicative of attackers establishing persistence and maintaining access to sensitive data (such as emails or files) even after potential credential resets.
This rule detects potential session hijacking by monitoring for the reuse of session or refresh tokens from unrecognized devices, browsers, or user agents, particularly when such activity occurs without an interactive MFA challenge. This behavior is indicative of an attacker attempting to use stolen session cookies or tokens to access cloud resources.
Detects the creation or modification of inbox rules in Office 365 that exhibit suspicious characteristics, such as external forwarding, automatic deletion/moving of sensitive emails (e.g., security alerts, junk), or rules containing keywords related to fraud. The rule optionally correlates this activity with recent anomalous sign-in attempts by the same user to identify potential account compromise.
This rule detects inbound Microsoft Teams calls originating from external or federated tenants where the caller's display name attempts to mimic internal IT support, help desk, or departmental roles. This behavior is a hallmark of vishing (voice phishing) attacks, often used as a secondary phase in social engineering campaigns following initial contact via email.
This rule detects potentially malicious Microsoft 365 sign-in events characterized by the use of residential proxy network providers commonly associated with session hijacking activities. It specifically flags sessions that were allowed without a Multi-Factor Authentication (MFA) challenge, suggesting the use of an already authenticated stolen session token.
Detects potential Adversary-in-the-Middle (AiTM) MFA bypass attacks (quishing). The rule correlates receipt of an email containing an image attachment (potential QR code) but no URL, followed by a risky mobile sign-in event from a device that is unmanaged or lacks trust within a two-hour window.
Detects inbound emails containing malicious QR codes (quishing) or HTML smuggling payloads designed to facilitate credential harvesting (AiTM). The rule identifies suspicious attachments, HTML-based obfuscation (e.g., atob, Blob) in email bodies, and QR-code-themed image attachments, filtering out internal communications.
Detects AWS CloudTrail and Azure Active Directory (Entra ID) privilege-escalation actions (e.g., attaching policies, creating access keys, adding roles) performed by principals from rare source IPs or associated with low-frequency administrative actions, indicating potentially compromised or unauthorized account activity.
This rule detects potential illicit consent grants to OAuth applications within Azure AD. It identifies applications requesting high-risk scopes (such as Mail.Read, Files.ReadWrite.All, etc.) that are not verified by a publisher, are granted by non-admin users, and subsequently exhibit high volumes of graph API calls (suggestive of unauthorized data access or exfiltration).
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