Sigma Rules
1,788 rules found for "Nextron Systems"
Suspicious Shell Open Command Registry Modification
Detects modifications to shell open registry keys that point to suspicious locations typically used by malware for persistence. Generally, modifications to the `*\shell\open\command` registry key can indicate an attempt to change the default action for opening files, and various UAC bypass or persistence techniques involve modifying these keys to execute malicious scripts or binaries.
Suspicious Space Characters in TypedPaths Registry Path - FileFix
Detects the occurrence of numerous space characters in TypedPaths registry paths, which may indicate execution via phishing lures using file-fix techniques to hide malicious commands.
Modify User Shell Folders Startup Value
Detect modification of the User Shell Folders registry values for Startup or Common Startup which could indicate persistence attempts. Attackers may modify User Shell Folders registry keys to point to malicious executables or scripts that will be executed during startup. This technique is often used to maintain persistence on a compromised system by ensuring that the malicious payload is executed automatically.
Enable LM Hash Storage
Detects changes to the "NoLMHash" registry value in order to allow Windows to store LM Hashes. By setting this registry value to "0" (DWORD), Windows will be allowed to store a LAN manager hash of your password in Active Directory and local SAM databases.
RDP Sensitive Settings Changed to Zero
Detects tampering of RDP Terminal Service/Server sensitive settings. Such as allowing unauthorized users access to a system via the 'fAllowUnsolicited' or enabling RDP via 'fDenyTSConnections', etc.
RDP Sensitive Settings Changed
Detects tampering of RDP Terminal Service/Server sensitive settings. Such as allowing unauthorized users access to a system via the 'fAllowUnsolicited' or enabling RDP via 'fDenyTSConnections', etc. Below is a list of registry keys/values that are monitored by this rule: - Shadow: Used to enable Remote Desktop shadowing, which allows an administrator to view or control a user's session. - DisableRemoteDesktopAntiAlias: Disables anti-aliasing for remote desktop sessions. - DisableSecuritySettings: Disables certain security settings for Remote Desktop connections. - fAllowUnsolicited: Allows unsolicited remote assistance offers. - fAllowUnsolicitedFullControl: Allows unsolicited remote assistance offers with full control. - InitialProgram: Specifies a program to run automatically when a user logs on to a remote computer. - ServiceDll: Used in RDP hijacking techniques to specify a custom DLL to be loaded by the Terminal Services service. - SecurityLayer: Specifies the security layer used for RDP connections.
Old TLS1.0/TLS1.1 Protocol Version Enabled
Detects applications or users re-enabling old TLS versions by setting the "Enabled" value to "1" for the "Protocols" registry key.
Potential Signing Bypass Via Windows Developer Features - Registry
Detects when the enablement of developer features such as "Developer Mode" or "Application Sideloading". Which allows the user to install untrusted packages.
UAC Bypass via Event Viewer
Detects UAC bypass method using Windows event viewer
UAC Bypass via Sdclt
Detects the pattern of UAC Bypass using registry key manipulation of sdclt.exe (e.g. UACMe 53)
UAC Bypass Abusing Winsat Path Parsing - Registry
Detects the pattern of UAC Bypass using a path parsing issue in winsat.exe (UACMe 52)
UAC Bypass Using Windows Media Player - Registry
Detects the pattern of UAC Bypass using Windows Media Player osksupport.dll (UACMe 32)
UAC Notification Disabled
Detects when an attacker tries to disable User Account Control (UAC) notification by tampering with the "UACDisableNotify" value. UAC is a critical security feature in Windows that prevents unauthorized changes to the operating system. It prompts the user for permission or an administrator password before allowing actions that could affect the system's operation or change settings that affect other users. When "UACDisableNotify" is set to 1, UAC prompts are suppressed.
VBScript Payload Stored in Registry
Detects VBScript content stored into registry keys as seen being used by UNC2452 group
Windows Vulnerable Driver Blocklist Disabled
Detects when the Windows Vulnerable Driver Blocklist is set to disabled. This setting is crucial for preventing the loading of known vulnerable drivers, and its modification may indicate an attempt to bypass security controls. It is often targeted by threat actors to facilitate the installation of malicious or vulnerable drivers, particularly in scenarios involving Endpoint Detection and Response (EDR) bypass techniques. This rule applies to systems that support the Vulnerable Driver Blocklist feature, including Windows 10 version 1903 and later, and Windows Server 2022 and later. Note that this change will require a reboot to take effect, and this rule only detects the registry modification action.
Disable Windows Defender Functionalities Via Registry Keys
Detects when attackers or tools disable Windows Defender functionalities via the Windows registry
Winget Admin Settings Modification
Detects changes to the AppInstaller (winget) admin settings. Such as enabling local manifest installations or disabling installer hash checks
Enable Local Manifest Installation With Winget
Detects changes to the AppInstaller (winget) policy. Specifically the activation of the local manifest installation, which allows a user to install new packages via custom manifests.
Winlogon AllowMultipleTSSessions Enable
Detects when the 'AllowMultipleTSSessions' value is enabled. Which allows for multiple Remote Desktop connection sessions to be opened at once. This is often used by attacker as a way to connect to an RDP session without disconnecting the other users
Sysmon Blocked Executable
Triggers on any Sysmon "FileBlockExecutable" event, which indicates a violation of the configured block policy
Suspicious Encoded Scripts in a WMI Consumer
Detects suspicious encoded payloads in WMI Event Consumers
Suspicious Scripting in a WMI Consumer
Detects suspicious commands that are related to scripting/powershell in WMI Event Consumers
Rejetto HTTP File Server RCE
Detects attempts to exploit a Rejetto HTTP File Server (HFS) via CVE-2014-6287
ZxShell Malware
Detects a ZxShell start by the called and well-known function name
Turla Group Commands May 2020
Detects commands used by Turla group as reported by ESET in May 2020
Exploit for CVE-2015-1641
Detects Winword starting uncommon sub process MicroScMgmt.exe as used in exploits for CVE-2015-1641
Exploit for CVE-2017-0261
Detects Winword starting uncommon sub process FLTLDR.exe as used in exploits for CVE-2017-0261 and CVE-2017-0262
Droppers Exploiting CVE-2017-11882
Detects exploits that use CVE-2017-11882 to start EQNEDT32.EXE and other sub processes like mshta.exe
Exploit for CVE-2017-8759
Detects Winword starting uncommon sub process csc.exe as used in exploits for CVE-2017-8759
Adwind RAT / JRAT
Detects javaw.exe in AppData folder as used by Adwind / JRAT
CosmicDuke Service Installation
Detects the installation of a service named "javamtsup" on the system. The CosmicDuke info stealer uses Windows services typically named "javamtsup" for persistence.
Fireball Archer Install
Detects Archer malware invocation via rundll32
Malware Shellcode in Verclsid Target Process
Detects a process access to verclsid.exe that injects shellcode from a Microsoft Office application / VBA macro
NotPetya Ransomware Activity
Detects NotPetya ransomware activity in which the extracted passwords are passed back to the main module via named pipe, the file system journal of drive C is deleted and Windows eventlogs are cleared using wevtutil
Potential PlugX Activity
Detects the execution of an executable that is typically used by PlugX for DLL side loading starting from an uncommon location
StoneDrill Service Install
This method detects a service install of the malicious Microsoft Network Realtime Inspection Service service described in StoneDrill report by Kaspersky
WannaCry Ransomware Activity
Detects WannaCry ransomware activity
Potential APT10 Cloud Hopper Activity
Detects potential process and execution activity related to APT10 Cloud Hopper operation
Ps.exe Renamed SysInternals Tool
Detects renamed SysInternals tool execution with a binary named ps.exe as used by Dragonfly APT group and documented in TA17-293A report
Equation Group C2 Communication
Detects communication to C2 servers mentioned in the operational notes of the ShadowBroker leak of EquationGroup C2 tools
Pandemic Registry Key
Detects Pandemic Windows Implant
Turla Service Install
This method detects a service install of malicious services mentioned in Carbon Paper - Turla report by ESET
Turla PNG Dropper Service
This method detects malicious services mentioned in Turla PNG dropper report by NCC Group in November 2018
SSHD Error Message CVE-2018-15473
Detects exploitation attempt using public exploit code for CVE-2018-15473
Oracle WebLogic Exploit
Detects access to a webshell dropped into a keystore folder on the WebLogic server
Elise Backdoor Activity
Detects Elise backdoor activity used by APT32
APT27 - Emissary Panda Activity
Detects the execution of DLL side-loading malware used by threat group Emissary Panda aka APT27
Sofacy Trojan Loader Activity
Detects Trojan loader activity as used by APT28