Splunk Security
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This analytic detects suspicious modifications to the EventLog security descriptor registry value for defense evasion. It leverages data from the Endpoint.Registry data model, focusing on changes to the "CustomSD" value within the "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Eventlog\<Channel>\CustomSD" path. This activity is significant as changes to the access permissions of the event log could blind security products and help attackers evade defenses. If confirmed malicious, this could allow attackers to block users and security products from viewing, ingesting and interacting event logs.
The analytic identifies instances where `control.exe` is spawned by a Microsoft Office product. This activity can indicate exploitation attempts, specifically related to CVE-2021-40444, where `control.exe` is used to execute malicious .cpl or .inf files. If confirmed malicious, this behavior could allow an attacker to execute arbitrary code, potentially leading to system compromise, data exfiltration, or further lateral movement within the network.
The following analytic detects instances where the PaperCut NG application (pc-app.exe) spawns a Windows shell, such as cmd.exe or PowerShell. This behavior is identified using Endpoint Detection and Response (EDR) telemetry, focusing on process creation events where the parent process is pc-app.exe. This activity is significant as it may indicate an attacker attempting to gain unauthorized access or execute malicious commands on the system. If confirmed malicious, this could lead to unauthorized code execution, privilege escalation, or further compromise of the affected environment.
This analytic identifies the use of the "remotesigned" execution policy for PowerShell scripts. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on command-line executions containing "remotesigned" and "-File". This activity is significant because the "remotesigned" policy allows locally created scripts to run without restrictions, posing a potential security risk. If confirmed malicious, an attacker could execute unauthorized scripts, leading to code execution, privilege escalation, or persistence within the environment.
The following analytic identifies instances where the regsvr32.exe binary has been renamed and executed. This detection leverages Endpoint Detection and Response (EDR) data, specifically focusing on the original filename metadata. Renaming regsvr32.exe is significant as it can be an evasion technique used by attackers to bypass security controls. If confirmed malicious, this activity could allow an attacker to execute arbitrary DLLs, potentially leading to code execution, privilege escalation, or persistence within the environment.
This analytic detects the use of `mmc.exe` to launch Computer Management (`compmgmt.msc`) and connect to a remote machine. This technique allows administrators to access system management tools, including Event Viewer, Services, Shared Folders, and Local Users & Groups, without initiating a full remote desktop session. While commonly used for legitimate administrative purposes, adversaries may leverage this method for remote reconnaissance, privilege escalation, or persistence. Monitoring the execution of `mmc.exe` with the `/computer:{hostname/ip}` argument can help detect unauthorized system administration attempts or lateral movement within a network.
This analytic detects instances where the `taskschd.dll` is loaded by processes running in suspicious or writable directories. This activity is unusual, as legitimate processes that load `taskschd.dll` typically reside in protected system locations. Malware or threat actors may attempt to load this DLL from writable or non-standard directories to manipulate the Task Scheduler and execute malicious tasks. By identifying processes that load `taskschd.dll` in these unsafe locations, this detection helps security analysts flag potentially malicious activity and investigate further to prevent unauthorized system modifications.
The analytic detects the creation of the "RemCom Service" on a Windows endpoint, which is a strong indicator of lateral movement using RemCom.exe. This activity is significant as it often signifies unauthorized lateral movement within the network, a common tactic used by attackers to spread malware or gain further access. If confirmed malicious, this could lead to unauthorized access to sensitive systems, data exfiltration, or further compromise of the network.
This analytic identifies the creation of a new kernel mode driver using the `sc.exe` command. The detection leverages process execution logs from Endpoint Detection and Response (EDR) agents, specifically focusing on command-line details. Adding a kernel driver is an uncommon activity in regular operations and can indicate an attempt to gain low-level access to the system. If confirmed malicious, this could allow an attacker to execute code with high privileges, potentially compromising the entire system and evading traditional security measures.
The following analytic identifies the execution of RemCom.exe, an open-source alternative to PsExec, used for lateral movement and remote command execution. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process names, original file names, and command-line arguments. This activity is significant as it indicates potential lateral movement within the network. If confirmed malicious, this could allow an attacker to execute commands remotely, potentially leading to further compromise and control over additional systems within the network.
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