Splunk Security
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This analytic identifies when specific Office 365 advanced security settings related to anti-phishing, safe links, safe attachments, or malware protection are altered within the Office 365 tenant. An attacker disabling these settings could reduce their risk of detection, potentially leading to unauthorized data access, data exfiltration, account compromise, or other malicious activities without leaving a detailed audit trail.
The following analytic detects instances where the inbox folder of an Office 365 mailbox is shared with all users within the tenant. It leverages Office 365 management activity events to identify when the 'Inbox' folder permissions are modified to include 'Everyone' with read rights. This activity is significant as it represents a potential security risk, allowing unauthorized access to sensitive emails. If confirmed malicious, this could lead to data breaches, exfiltration of confidential information, and further compromise through spear-phishing or other malicious activities based on the accessed email content.
This analytic detects the use of PowerShell to delete shadow copies, a common tactic used by ransomware to prevent data recovery. It specifically looks for PowerShell Script Block Logging (EventCode 4104) events containing keywords like "ShadowCopy" along with "Delete" or "Remove" in the ScriptBlockText. Successful execution of such commands can lead to irreversible data loss and hinder recovery efforts.
The following analytic identifies the execution of `PsExec.exe` with the `accepteula` flag in the command line. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process execution logs and command-line arguments. This activity is significant because PsExec is commonly used by threat actors to execute code on remote systems, and the `accepteula` flag indicates first-time usage, which could signify initial compromise. If confirmed malicious, this activity could allow attackers to gain remote code execution capabilities, potentially leading to further system compromise and lateral movement within the network.
The following analytic detects the modification of registry keys to disable System Restore on a machine. It leverages data from the Endpoint.Registry data model, specifically monitoring changes to registry paths associated with System Restore settings. This activity is significant because disabling System Restore can hinder recovery efforts and is a tactic often used by Remote Access Trojans (RATs) to maintain persistence on an infected system. If confirmed malicious, this action could prevent system recovery, allowing the attacker to sustain their foothold and potentially cause further damage or data loss.
The analytic detects a suspicious registry modification that enables the plain text credential feature in Windows by setting the "UseLogonCredential" value to 1 in the WDigest registry path. This activity is commonly used by malware and tools like Mimikatz to dump plain text credentials, indicating a potential credential dumping attempt. If confirmed malicious, this could allow an attacker to obtain sensitive credentials, leading to further compromise and lateral movement within the network.
This analytic leverages alerts from Microsoft Defender O365 Incidents. It aggregates and summarizes these alerts, extracting details such as destination, file name, severity, process command line, IP address, registry key, signature, description, and timestamps. The detection filters out alerts with a verdict of 'Clean' from Microsoft. It dynamically maps MITRE techniques from the alert data and assigns a risk score based on the alert's severity. This rule is designed to correlate Microsoft-provided alerts with other data for risk-based alerting, rather than detecting new activity from raw data.
The following analytic detects modifications to undocumented registry keys that allow a DLL to load into lsass.exe, potentially capturing credentials. It leverages the Endpoint.Registry data model to identify changes to \CurrentControlSet\Services\NTDS\DirectoryServiceExtPt or \CurrentControlSet\Services\NTDS\LsaDbExtPt. This activity is significant as it indicates a possible attempt to inject malicious code into the Local Security Authority Subsystem Service (LSASS), which can lead to credential theft. If confirmed malicious, this could allow attackers to gain unauthorized access to sensitive information and escalate privileges within the environment.
The following analytic identifies the execution of `net.exe` with command line arguments aimed at obtaining the computer or domain password policy. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process names and command-line executions. This activity is significant as it indicates potential reconnaissance efforts by adversaries to gather information about Active Directory password policies. If confirmed malicious, this behavior could allow attackers to understand password complexity requirements, aiding in brute-force or password-guessing attacks, ultimately compromising user accounts and gaining unauthorized access to the network.
The analytic detects ARP Poisoning attacks by monitoring for Dynamic ARP Inspection (DAI) errors on Cisco network devices. It leverages logs from Cisco devices, specifically looking for events where the ARP inspection feature has disabled an interface due to suspicious activity. This activity is significant because ARP Poisoning can allow attackers to intercept, modify, or disrupt network traffic, leading to potential data breaches or denial of service. If confirmed malicious, this could enable attackers to perform man-in-the-middle attacks, compromising the integrity and confidentiality of network communications.
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