Ibrahim Saud
@tektrixIndiaCompletionist
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11,679 detections
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Detects login events to the 'My Sign-Ins' portal (mysignins.microsoft.com) by users. This portal is a high-value target for adversaries who have gained access to a session via token theft or session hijacking, as it allows them to modify or add authentication methods (such as MFA devices) to establish long-term persistence in the victim's account.
This rule detects a suspicious Azure sign-in sequence, identified by error code 50074 (User failed MFA) followed by 50140 (This error occurred due to 'Keep me signed in' interrupt when the user was authenticating). This pattern is indicative of an Adversary-in-the-Middle (AiTM) phishing attack where the attacker is attempting to bypass MFA or manipulate session persistence after capturing initial credentials.
Detects the use of the OAuth device code authentication flow in Azure AD/Entra ID sign-in events. This flow is frequently abused by attackers who use vishing or SMS phishing pretexts to trick users into authorizing a device login, enabling the attacker to obtain a valid session token without direct credential harvesting or cookie theft.
Detects multiple authentication failures in Azure AD (specifically error codes 50074: strong authentication required/MFA failure and 50140: interruption of MFA completion) originating from devices identified as either unmanaged or non-compliant. This pattern often indicates an adversary attempting to brute force or bypass conditional access policies by leveraging credentials where the device security posture is insufficient.
Detects high-volume or large-size file access, download, or preview activity originating from known anonymous proxy IP addresses. This behavior is indicative of potential data exfiltration or unauthorized scraping of sensitive documents from cloud storage.
Detects sign-in activity to the 'Office Home' portal from an unmanaged, non-compliant device, followed by authentication to sensitive cloud services like SharePoint Online, OneDrive, or Microsoft Graph. This pattern often indicates a potential session hijacking or post-compromise activity where an attacker uses an unmanaged device to access enterprise data via cloud application discovery.
This rule detects anomalous, high-volume file and email access events by a single user from a single IP address within the Microsoft 365 environment. The detection logic groups operations such as file downloads, file access, and mailbox item access, flagging instances where a user performs 100 or more such operations, which may indicate data exfiltration or compromised account activity.
This rule identifies potentially malicious Azure AD/Entra authentication flows by flagging interruptions during MFA (e.g., failure codes 50074, 50140 indicating MFA requirements or time-outs during suspected AiTM phishing attempts) and the usage of Device Code Grant flows, which are frequently abused by adversaries to bypass MFA and capture session tokens.
Detects users accessing files across SharePoint, OneDrive, or Exchange over a sustained period of at least 6 hours, while maintaining a low-to-moderate frequency (1-999 events per hour). This behavioral pattern may indicate slow, automated data exfiltration or unauthorized reconnaissance of sensitive files while attempting to stay under traditional volume-based alerting thresholds.
Detects multiple failed multifactor authentication (MFA) attempts from the same user on an unmanaged device. This behavior is indicative of an adversary attempting to bypass MFA or perform MFA fatigue attacks using stolen credentials.
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