Splunk Security
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The analytic detects the execution of tasks registered in Windows Task Scheduler by monitoring EventID 200 (action run) and 201 (action completed) from the Task Scheduler logs. This detection leverages Task Scheduler logs to identify potentially suspicious or unauthorized task executions. Monitoring these events is significant for a SOC as it helps uncover evasive techniques used for persistence, unauthorized code execution, or other malicious activities. If confirmed malicious, this activity could lead to unauthorized access, data exfiltration, or the execution of harmful payloads, posing a significant threat to the environment.
This analytic detects the modification of Access Control List (ACL) permissions to files or folders on Windows systems, specifically when permissions are granted to 'Everyone' or 'SYSTEM' accounts. It monitors the execution of built-in Windows utilities like `cacls.exe`, `icacls.exe`, and `xcacls.exe` with command-line arguments indicative of granting broad access. Such activity is significant as it may suggest an adversary attempting to bypass security controls, evade detection, or gain unauthorized access to sensitive files, potentially leading to data breaches or further system compromise.
The analytic detects the use of `icacls.exe`, `cacls.exe`, or `xcacls.exe` with the `/grant` argument to modify file or directory permissions. This activity is often used by adversaries, including APTs and coinminer scripts, to establish persistence, evade detection, and maintain control over compromised systems. Granting additional access can lead to unauthorized access, data exfiltration, or further system compromise.
The following analytic detects instances of Winlogon.exe, a critical Windows process, connecting to public IP addresses. This behavior is identified using Endpoint Detection and Response (EDR) telemetry, focusing on network connections made by Winlogon.exe. Under normal circumstances, Winlogon.exe should not connect to public IPs, and such activity may indicate a compromise, such as the BlackLotus bootkit attack. This detection is significant as it highlights potential system integrity breaches. If confirmed malicious, attackers could maintain persistence, bypass security measures, and compromise the system at a fundamental level.
The following analytic identifies the modification of security permissions on files or directories using tools like icacls.exe, cacls.exe, or xcacls.exe. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on specific command-line executions. This activity is significant as it is commonly used by Advanced Persistent Threats (APTs) and coinminer scripts to evade detection and maintain control over compromised systems. If confirmed malicious, this behavior could allow attackers to hinder investigation, impede remediation efforts, and maintain persistent access to the compromised environment.
The following analytic detects instances where an adversary modifies security permissions of a file or directory using commands like "icacls.exe", "cacls.exe", or "xcacls.exe" with deny options. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process names and command-line executions. This activity is significant as it is commonly used by Advanced Persistent Threats (APTs) and coinminer scripts to evade detection and impede access to critical files. If confirmed malicious, this could allow attackers to maintain persistence and hinder incident response efforts.
The following analytic detects the enabling of permission inheritance using ICACLS. This analytic identifies instances where ICACLS commands are used to enable permission inheritance on files or directories. The /inheritance:e flag, which restores inherited permissions from a parent directory, is monitored to detect changes that might reapply broader access control settings. Enabling inheritance can indicate legitimate administrative actions but may also signal attempts to override restrictive custom permissions, potentially exposing sensitive files to unauthorized access.
This rule identifies 'improbable travel' scenarios where a user successfully logs in from two geographically distant locations within a short time frame, suggesting potential account compromise or abuse, possibly related to Remote Employment Fraud (REF). It calculates the speed of travel required between consecutive login locations and flags events where the speed and distance exceed predefined thresholds. It also checks if the login country differs from the user's known work country.
This analytic detects suspicious modifications to Unix shell configuration files, such as `.bashrc` or `.profile`, which may indicate an attempt to alter system behavior or gain unauthorized access. Unauthorized changes to these files can be used to execute malicious commands, escalate privileges, or hide malicious activities. By monitoring for unusual or unauthorized modifications to shell configuration files, this analytic helps identify potential security threats, allowing security teams to respond quickly and mitigate risks.
This rule detects Okta authentication attempts originating from known VPN providers. Threat actors, particularly those involved in Remote Employment Fraud (REF), often use VPNs to mask their true physical location and evade detection. By identifying connections from a listing of commonly used VPN services, this rule aims to flag potentially suspicious access to Okta accounts. The rule extracts user information, client details, geographical context, and debug data to provide comprehensive insights into the VPN usage.
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