Sigma Rules
1,414 rules found for "Nextron Systems"
Delete Important Scheduled Task
Detects when adversaries stop services or processes by deleting their respective scheduled tasks in order to conduct data destructive activities
Delete All Scheduled Tasks
Detects the usage of schtasks with the delete flag and the asterisk symbol to delete all tasks from the schedule of the local computer, including tasks scheduled by other users.
Disable Important Scheduled Task
Detects when adversaries stop services or processes by disabling their respective scheduled tasks in order to conduct data destructive activities
Schedule Task Creation From Env Variable Or Potentially Suspicious Path Via Schtasks.EXE
Detects Schtask creations that point to a suspicious folder or an environment variable often used by malware
Schtasks From Suspicious Folders
Detects scheduled task creations that have suspicious action command and folder combinations
Suspicious Scheduled Task Name As GUID
Detects creation of a scheduled task with a GUID like name
Potential Persistence Via Powershell Search Order Hijacking - Task
Detects suspicious powershell execution via a schedule task where the command ends with an suspicious flags to hide the powershell instance instead of executeing scripts or commands. This could be a sign of persistence via PowerShell "Get-Variable" technique as seen being used in Colibri Loader
Scheduled Task Executing Payload from Registry
Detects the creation of a schtasks that potentially executes a payload stored in the Windows Registry using PowerShell.
Scheduled Task Executing Encoded Payload from Registry
Detects the creation of a schtask that potentially executes a base64 encoded payload stored in the Windows Registry using PowerShell.
Suspicious Schtasks Schedule Types
Detects scheduled task creations or modification on a suspicious schedule type
Suspicious Schtasks Schedule Type With High Privileges
Detects scheduled task creations or modification to be run with high privileges on a suspicious schedule type
Suspicious Command Patterns In Scheduled Task Creation
Detects scheduled task creation using "schtasks" that contain potentially suspicious or uncommon commands
Schtasks Creation Or Modification With SYSTEM Privileges
Detects the creation or update of a scheduled task to run with "NT AUTHORITY\SYSTEM" privileges
Scheduled Task Creation Masquerading as System Processes
Detects the creation of scheduled tasks that involve system processes, which may indicate malicious actors masquerading as or abusing these processes to execute payloads or maintain persistence.
Service StartupType Change Via Sc.EXE
Detect the use of "sc.exe" to change the startup type of a service to "disabled" or "demand"
New Kernel Driver Via SC.EXE
Detects creation of a new service (kernel driver) with the type "kernel"
Allow Service Access Using Security Descriptor Tampering Via Sc.EXE
Detects suspicious DACL modifications to allow access to a service from a suspicious trustee. This can be used to override access restrictions set by previous ACLs.
Service Security Descriptor Tampering Via Sc.EXE
Detection of sc.exe utility adding a new service with special permission which hides that service.
Suspicious Service Path Modification
Detects service path modification via the "sc" binary to a suspicious command or path
Stop Windows Service Via Sc.EXE
Detects the stopping of a Windows service via the "sc.exe" utility
Uncommon Extension Shim Database Installation Via Sdbinst.EXE
Detects installation of a potentially suspicious new shim with an uncommon extension using sdbinst.exe. Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by application shims
NodeJS Execution of JavaScript File
Detects execution of JavaScript or JSC files using NodeJs binary node.exe, that could be potentially suspicious. Node.js is a popular open-source JavaScript runtime that runs code outside browsers and is widely used for both frontend and backend development. Adversaries have been observed abusing Node.js to disguise malware as legitimate processes, evade security defenses, and maintain persistence within target systems. Because Node.js is commonly used, this rule may generate false positives in some environments. However, if such activity is unusual in your environment, it is highly suspicious and warrants immediate investigation.
Suspicious Serv-U Process Pattern
Detects a suspicious process pattern which could be a sign of an exploited Serv-U service
Uncommon Child Process Of Setres.EXE
Detects uncommon child process of Setres.EXE. Setres.EXE is a Windows server only process and tool that can be used to set the screen resolution. It can potentially be abused in order to launch any arbitrary file with a name containing the word "choice" from the current execution path.
Indirect Command Execution via SFTP ProxyCommand
Detects the use of SFTP.exe to execute commands indirectly via ProxyCommand parameter. Threat actors were seen leveraging this legitimate Windows binary to bypass security controls and execute arbitrary commands while evading detection.
Uncommon Sigverif.EXE Child Process
Detects uncommon child processes spawning from "sigverif.exe", which could indicate potential abuse of the latter as a living of the land binary in order to proxy execution.
Uncommon Child Processes Of SndVol.exe
Detects potentially uncommon child processes of SndVol.exe (the Windows volume mixer)
Suspicious Splwow64 Without Params
Detects suspicious Splwow64.exe process without any command line parameters
Veeam Backup Database Suspicious Query
Detects potentially suspicious SQL queries using SQLCmd targeting the Veeam backup databases in order to steal information.
Arbitrary File Download Via Squirrel.EXE
Detects the usage of the "Squirrel.exe" to download arbitrary files. This binary is part of multiple Electron based software installations (Slack, Teams, Discord, etc.)
Process Proxy Execution Via Squirrel.EXE
Detects the usage of the "Squirrel.exe" binary to execute arbitrary processes. This binary is part of multiple Electron based software installations (Slack, Teams, Discord, etc.)
Port Forwarding Activity Via SSH.EXE
Detects port forwarding activity via SSH.exe
Program Executed Using Proxy/Local Command Via SSH.EXE
Detect usage of the "ssh.exe" binary as a proxy to launch other programs.
Potential RDP Tunneling Via SSH
Execution of ssh.exe to perform data exfiltration and tunneling through RDP
User Added to Local Administrators Group
Detects addition of users to the local administrator group via "Net" or "Add-LocalGroupMember".
User Added To Highly Privileged Group
Detects addition of users to highly privileged groups via "Net" or "Add-LocalGroupMember".
User Added to Remote Desktop Users Group
Detects addition of users to the local Remote Desktop Users group via "Net" or "Add-LocalGroupMember".
Potentially Suspicious Windows App Activity
Detects potentially suspicious child process of applications launched from inside the WindowsApps directory. This could be a sign of a rogue ".appx" package installation/execution
Phishing Pattern ISO in Archive
Detects cases in which an ISO files is opend within an archiver like 7Zip or Winrar, which is a sign of phishing as threat actors put small ISO files in archives as email attachments to bypass certain filters and protective measures (mark of web)
Bad Opsec Defaults Sacrificial Processes With Improper Arguments
Detects attackers using tooling with bad opsec defaults. E.g. spawning a sacrificial process to inject a capability into the process without taking into account how the process is normally run. One trivial example of this is using rundll32.exe without arguments as a sacrificial process (default in CS, now highlighted by c2lint), running WerFault without arguments (Kraken - credit am0nsec), and other examples.
Suspicious ClickFix/FileFix Execution Pattern
Detects suspicious execution patterns where users are tricked into running malicious commands via clipboard manipulation, either through the Windows Run dialog (ClickFix) or File Explorer address bar (FileFix). Attackers leverage social engineering campaigns—such as fake CAPTCHA challenges or urgent alerts—encouraging victims to paste clipboard contents, often executing mshta.exe, powershell.exe, or similar commands to infect systems.
Suspicious Explorer Process with Whitespace Padding - ClickFix/FileFix
Detects process creation with suspicious whitespace padding followed by a '#' character, which may indicate ClickFix or FileFix techniques used to conceal malicious commands from visual inspection. ClickFix and FileFix are social engineering attack techniques where adversaries distribute phishing documents or malicious links that deceive users into opening the Windows Run dialog box or File Explorer search bar. The victims are then instructed to paste commands from their clipboard, which contain extensive whitespace padding using various Unicode space characters to push the actual malicious command far to the right, effectively hiding it from immediate view.
Potential CommandLine Obfuscation Using Unicode Characters From Suspicious Image
Detects potential commandline obfuscation using unicode characters. Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit.
Potential Command Line Path Traversal Evasion Attempt
Detects potential evasion or obfuscation attempts using bogus path traversal via the commandline
Potential Browser Data Stealing
Adversaries may acquire credentials from web browsers by reading files specific to the target browser. Web browsers commonly save credentials such as website usernames and passwords so that they do not need to be entered manually in the future. Web browsers typically store the credentials in an encrypted format within a credential store.
Copy From Or To Admin Share Or Sysvol Folder
Detects a copy command or a copy utility execution to or from an Admin share or remote
Suspicious Copy From or To System Directory
Detects a suspicious copy operation that tries to copy a program from system (System32, SysWOW64, WinSxS) directories to another on disk. Often used to move LOLBINs such as 'certutil' or 'desktopimgdownldr' to a different location with a different name in order to bypass detections based on locations.
LOL-Binary Copied From System Directory
Detects a suspicious copy operation that tries to copy a known LOLBIN from system (System32, SysWOW64, WinSxS) directories to another on disk in order to bypass detections based on locations.