Sigma Rules
170 rules found for "Swachchhanda Shrawan Poudel (Nextron Systems)"
Service Startup Type Change Via Wmic.EXE
Detects changes to service startup type to 'disabled' or 'manual' using the WMIC command-line utility.
Potential Remote SquiblyTwo Technique Execution
Detects potential execution of the SquiblyTwo technique that leverages Windows Management Instrumentation (WMI) to execute malicious code remotely. This technique bypasses application whitelisting by using wmic.exe to process malicious XSL (eXtensible Stylesheet Language) scripts that can contain embedded JScript or VBScript. The attack typically works by fetching XSL content from a remote source (using HTTP/HTTPS) and executing it with full trust privileges directly in memory, avoiding disk-based detection mechanisms. This is a common LOLBin (Living Off The Land Binary) technique used for defense evasion and code execution.
Installation of WSL Kali-Linux
Detects installation of Kali Linux distribution through Windows Subsystem for Linux (WSL). Attackers may use Kali Linux WSL to leverage its penetration testing tools and capabilities for malicious purposes.
WSL Kali-Linux Usage
Detects the use of Kali Linux through Windows Subsystem for Linux
Windows Credential Guard Related Registry Value Deleted - Registry
Detects attempts to disable Windows Credential Guard by deleting registry values. Credential Guard uses virtualization-based security to isolate secrets so that only privileged system software can access them. Adversaries may disable Credential Guard to gain access to sensitive credentials stored in the system, such as NTLM hashes and Kerberos tickets, which can be used for lateral movement and privilege escalation.
RunMRU Registry Key Deletion - Registry
Detects attempts to delete the RunMRU registry key, which stores the history of commands executed via the run dialog. In the clickfix techniques, the phishing lures instruct users to open a run dialog through (Win + R) and execute malicious commands. Adversaries may delete this key to cover their tracks after executing commands.
Registry Tampering by Potentially Suspicious Processes
Detects suspicious registry modifications made by suspicious processes such as script engine processes such as WScript, or CScript etc. These processes are rarely used for legitimate registry modifications, and their activity may indicate an attempt to modify the registry without using standard tools like regedit.exe or reg.exe, potentially for evasion and persistence.
AMSI Disabled via Registry Modification
Detects attempts to disable AMSI (Anti-Malware Scan Interface) by modifying the AmsiEnable registry value. Anti-Malware Scan Interface (AMSI) is a security feature in Windows that allows applications and services to integrate with anti-malware products for enhanced protection against malicious content. Adversaries may attempt to disable AMSI to evade detection by security software, allowing them to execute malicious scripts or code without being scanned.
Security Event Logging Disabled via MiniNt Registry Key - Registry Set
Detects the addition of the 'MiniNt' key to the registry. Upon a reboot, Windows Event Log service will stop writing events. Windows Event Log is a service that collects and stores event logs from the operating system and applications. It is an important component of Windows security and auditing. Adversary may want to disable this service to disable logging of security events which could be used to detect their activities.
Windows Credential Guard Disabled - Registry
Detects attempts to disable Windows Credential Guard by setting registry values to 0. Credential Guard uses virtualization-based security to isolate secrets so that only privileged system software can access them. Adversaries may disable Credential Guard to gain access to sensitive credentials stored in the system, such as NTLM hashes and Kerberos tickets, which can be used for lateral movement and privilege escalation.
FileFix - Command Evidence in TypedPaths
Detects commonly-used chained commands and strings in the most recent 'url' value of the 'TypedPaths' key, which could be indicative of a user being targeted by the FileFix technique.
Potential ClickFix Execution Pattern - Registry
Detects potential ClickFix malware execution patterns by monitoring registry modifications in RunMRU keys containing HTTP/HTTPS links. ClickFix is known to be distributed through phishing campaigns and uses techniques like clipboard hijacking and fake CAPTCHA pages. Through the fakecaptcha pages, the adversary tricks users into opening the Run dialog box and pasting clipboard-hijacked content, such as one-liners that execute remotely hosted malicious files or scripts.
Registry Modification for OCI DLL Redirection
Detects registry modifications related to 'OracleOciLib' and 'OracleOciLibPath' under 'MSDTC' settings. Threat actors may modify these registry keys to redirect the loading of 'oci.dll' to a malicious DLL, facilitating phantom DLL hijacking via the MSDTC service.
Suspicious Space Characters in RunMRU Registry Path - ClickFix
Detects the occurrence of numerous space characters in RunMRU registry paths, which may indicate execution via phishing lures using clickfix techniques to hide malicious commands in the Windows Run dialog box from naked eyes.
New RUN Key Pointing to Suspicious Folder
Detects suspicious new RUN key element pointing to an executable in a suspicious folder
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.
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.
Potential Exploitation of GoAnywhere MFT Vulnerability
Detects suspicious command execution by child processes of the GoAnywhere Managed File Transfer (MFT) application, which may indicate exploitation such as CVE-2025-10035. This behavior is indicative of post-exploitation activity related to CVE-2025-10035, as observed in campaigns by the threat actor Storm-1175.
Cisco ASA Exploitation Activity - Proxy
Detects suspicious requests to Cisco ASA WebVpn via proxy logs associated with CVE-2025-20333 and CVE-2025-20362 exploitation.
Suspicious CrushFTP Child Process
Detects suspicious child processes spawned by the CrushFTP service that may indicate exploitation of remote code execution vulnerabilities such as CVE-2025-31161, where attackers can achieve RCE through crafted HTTP requests. The detection focuses on commonly abused Windows executables (like powershell.exe, cmd.exe etc.) that attackers typically use post-exploitation to execute malicious commands.
Potential SAP NetWeaver Webshell Creation - Linux
Detects the creation of suspicious files (jsp, java, class) in SAP NetWeaver directories, which may indicate exploitation attempts of vulnerabilities such as CVE-2025-31324.
Potential SAP NetWeaver Webshell Creation
Detects the creation of suspicious files (jsp, java, class) in SAP NetWeaver directories, which may indicate exploitation attempts of vulnerabilities such as CVE-2025-31324.
Suspicious Child Process of SAP NetWeaver - Linux
Detects suspicious child processes spawned by SAP NetWeaver on Linux systems that could indicate potential exploitation of vulnerability that allows arbitrary execution via webshells such as CVE-2025-31324.
Suspicious Child Process of SAP NetWeaver
Detects suspicious child processes spawned by SAP NetWeaver that could indicate potential exploitation of vulnerability that allows arbitrary execution via webshells such as CVE-2025-31324.
Potential SAP NetViewer Webshell Command Execution
Detects potential command execution via webshell in SAP NetViewer through JSP files with cmd parameter. This rule is created to detect exploitation of vulnerabilities like CVE-2025-31324, which allows remote code execution via a webshell.
Potential Java WebShell Upload in SAP NetViewer Server
Detects potential Java webshell uploads via HTTP requests with Content-Type 'application/octet-stream' and Java file extensions. This behavior might indicate exploitation of vulnerabilities like CVE-2025-31324, which allows remote code execution through webshells in SAP NetViewer.
Potential Exploitation of RCE Vulnerability CVE-2025-33053 - Image Load
Detects potential exploitation of remote code execution vulnerability CVE-2025-33053 by monitoring suspicious image loads from WebDAV paths. The exploit involves malicious executables from attacker-controlled WebDAV servers loading the Windows system DLLs like gdi32.dll, netapi32.dll, etc.
Potential Exploitation of RCE Vulnerability CVE-2025-33053 - Process Access
Detects potential exploitation of remote code execution vulnerability CVE-2025-33053 by looking for process access that involves legitimate Windows executables (iediagcmd.exe, CustomShellHost.exe) accessing suspicious executables hosted on WebDAV shares. This indicates an attacker may be exploiting Process.Start() search order manipulation to execute malicious code from attacker-controlled WebDAV servers instead of legitimate system binaries. The vulnerability allows unauthorized code execution through external control of file names or paths via WebDAV.
Potential Exploitation of RCE Vulnerability CVE-2025-33053
Detects potential exploitation of remote code execution vulnerability CVE-2025-33053 which involves unauthorized code execution via WebDAV through external control of file names or paths. The exploit abuses legitimate utilities like iediagcmd.exe or CustomShellHost.exe by manipulating their working directories to point to attacker-controlled WebDAV servers, causing them to execute malicious executables (like route.exe) from the WebDAV path instead of legitimate system binaries through Process.Start() search order manipulation.
Suspicious Child Process of SolarWinds WebHelpDesk
Detects suspicious child processes spawned by SolarWinds WebHelpDesk (WHD) application, which may indicate exploitation activity leveraging RCE vulnerabilities such as CVE-2025-40551, CVE-2025-40536, or CVE-2025-26399
Potential Exploitation of CVE-2025-4427/4428 Ivanti EPMM Pre-Auth RCE
Detects potential exploitation of a chained vulnerability attack targeting Ivanti EPMM 12.5.0.0. CVE-2025-4427 allows unauthenticated access to protected API endpoints via an authentication bypass, which can then be leveraged to trigger CVE-2025-4428 — a remote code execution vulnerability through template injection. This sequence enables unauthenticated remote code execution, significantly increasing the impact of exploitation.
Potential Notepad++ CVE-2025-49144 Exploitation
Detects potential exploitation of CVE-2025-49144, a local privilege escalation vulnerability in Notepad++ installers (v8.8.1 and prior) where the installer calls regsvr32.exe without specifying the full path. This allows an attacker to execute arbitrary code with elevated privileges by placing a malicious regsvr32.exe alongside this Legitimate Notepad++ installer. The vulnerability is triggered when the installer attempts to register the NppShell.dll file, which is a component of Notepad++.
Potential SharePoint ToolShell CVE-2025-53770 Exploitation - File Create
Detects the creation of file such as spinstall0.aspx which may indicate successful exploitation of CVE-2025-53770. CVE-2025-53770 is a zero-day vulnerability in SharePoint that allows remote code execution.
Potential SharePoint ToolShell CVE-2025-53770 Exploitation Indicators
Detects potential exploitation of CVE-2025-53770 by identifying indicators such as suspicious command lines discovered in Post-Exploitation activities. CVE-2025-53770 is a zero-day vulnerability in SharePoint that allows remote code execution.
SharePoint ToolShell CVE-2025-53770 Exploitation - Web IIS
Detects access to vulnerable SharePoint components potentially being exploited in CVE-2025-53770 through IIS web server logs. CVE-2025-53770 is a zero-day vulnerability in SharePoint that allows remote code execution.
Linux Suspicious Child Process from Node.js - React2Shell
Detects suspicious child processes spawned from Node.js server processes on Linux systems, potentially indicating remote code execution exploitation such as CVE-2025-55182 (React2Shell). This rule particularly looks for exploitation of vulnerability on Node.js Servers where attackers abuse Node.js child_process module to execute arbitrary system commands. When execSync() or exec() is used, the command line often includes a shell invocation followed by suspicious commands or scripts (e.g., /bin/sh -c <malicious-command>). For other methods, the Image field will show the spawned process directly.
Windows Suspicious Child Process from Node.js - React2Shell
Detects suspicious child processes started by Node.js server processes on Windows, which may indicate exploitation of vulnerabilities like CVE-2025-55182 (React2Shell). Attackers can abuse the Node.js 'child_process' module to run system commands or scripts using methods such as spawn(), exec(), execFile(), fork(), or execSync(). If execSync() or exec() is used in the exploit, the command line often shows a shell (e.g., cmd.exe /d /s /c ...) running a suspicious command unless other shells are explicitly invoked. For other methods, the spawned process appears directly in the Image field unless a shell is explicitly used.
Commvault QLogin with PublicSharingUser and GUID Password (CVE-2025-57788)
Detects a qlogin.exe command attempting to authenticate as the internal `_+_PublicSharingUser_` using a GUID as the password. This could be an indicator of an attacker exploiting CVE-2025-57788 to gain initial access using leaked credentials.
Commvault QOperation Path Traversal Webshell Drop (CVE-2025-57790)
Detects the use of qoperation.exe with the -file argument to write a JSP file to the webroot, indicating a webshell drop. This is a post-authentication step corresponding to CVE-2025-57790.
Commvault QLogin Argument Injection Authentication Bypass (CVE-2025-57791)
Detects the use of argument injection in the Commvault qlogin command - potential exploitation for CVE-2025-57791. An attacker can inject the `-localadmin` parameter via the password field to bypass authentication and gain a privileged token.
Exploitation Activity of CVE-2025-59287 - WSUS Suspicious Child Process
Detects the creation of command-line interpreters (cmd.exe, powershell.exe) as child processes of Windows Server Update Services (WSUS) related process wsusservice.exe. This behavior is a key indicator of exploitation for the critical remote code execution vulnerability such as CVE-2025-59287, where attackers spawn shells to conduct reconnaissance and further post-exploitation activities.
Exploitation Activity of CVE-2025-59287 - WSUS Deserialization
Detects cast exceptions in Windows Server Update Services (WSUS) application logs that highly indicate exploitation attempts of CVE-2025-59287, a deserialization vulnerability in WSUS.
Grixba Malware Reconnaissance Activity
Detects execution of the Grixba reconnaissance tool based on suspicious command-line parameter combinations. This tool is used by the Play ransomware group for network enumeration, data gathering, and event log clearing.
DNS Query To Katz Stealer Domains
Detects DNS queries to domains associated with Katz Stealer malware. Katz Stealer is a malware variant that is known to be used for stealing sensitive information from compromised systems. In Enterprise environments, DNS queries to these domains may indicate potential malicious activity or compromise.
Katz Stealer DLL Loaded
Detects loading of DLLs associated with Katz Stealer malware 2025 variants. Katz Stealer is a malware variant that is known to be used for stealing sensitive information from compromised systems. The process that loads these DLLs are very likely to be malicious.
DNS Query To Katz Stealer Domains - Network
Detects DNS queries to domains associated with Katz Stealer malware. Katz Stealer is a malware variant that is known to be used for stealing sensitive information from compromised systems. In Enterprise environments, DNS queries to these domains may indicate potential malicious activity or compromise.