LoFP LoFP / legitimate administrative or security assessment activities may use these user-agents, especially in environments where bloodhound is employed for authorized audits. if this is expected behavior, consider adjusting the rule or adding exceptions for specific user-agents or ip addresses.

Sample rules

BloodHound Suite User-Agents Detected

Description

Identifies potential enumeration activity using AzureHound, SharpHound, or BloodHound across Microsoft cloud services. These tools are often used by red teamers and adversaries to map users, groups, roles, applications, and access relationships within Microsoft Entra ID (Azure AD) and Microsoft 365.

Detection logic

any where event.dataset : (
    "azure.activitylogs",
    "azure.graphactivitylogs",
    "azure.auditlogs",
    "azure.signinlogs",
    "o365.audit"
) and user_agent.original regex~ "(azure|sharp|blood)(hound)/.*"

TeamFiltration User-Agents Detected

Description

Identifies potential enumeration or password spraying activity using TeamFiltration tool. TeamFiltration is an open-source enumeration, password spraying and exfiltration tool designed for Entra ID and Microsoft 365. Adversaries are known to use TeamFiltration in-the-wild to enumerate users, groups, and roles, as well as to perform password spraying attacks against Microsoft Entra ID and Microsoft 365 accounts. This rule detects the use of TeamFiltration by monitoring for specific user-agent strings associated with the tool in Azure and Microsoft 365 logs.

Detection logic

event.dataset:("azure.signinlogs" or "o365.audit")
    and ((user_agent.name:"Electron" and user_agent.os.name:"Windows" and user_agent.version:"8.5.1") or
    user_agent.original:"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Teams/1.3.00.30866 Chrome/80.0.3987.165 Electron/8.5.1 Safari/537.36")