Sigma Rules
52 rules found for "Swachchhanda Shrawan Poudel (Nextron Systems)"
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.
Katz Stealer Suspicious User-Agent
Detects network connections with a suspicious user-agent string containing "katz-ontop", which may indicate Katz Stealer activity.
Shai-Hulud Malicious GitHub Workflow Creation
Detects creation of shai-hulud-workflow.yml file associated with Shai Hulud worm targeting NPM supply chain attack that exfiltrates GitHub secrets
Shai-Hulud Malware Indicators - Linux
Detects potential Shai-Hulud malware indicators based on specific command line arguments associated with its execution.
Shai-Hulud Malicious Bun Execution - Linux
Detects the execution of `bun_environment.js` via the Bun runtime, a behavior associated with the Shai-Hulud "Second Coming" NPM supply chain attack. The malware uses a `setup_bun.js` script to install the Bun runtime if not present, and then executes the malicious `bun_environment.js` payload.
Shai-Hulud 2.0 Malicious NPM Package Installation - Linux
Detects the command-line installation of specific malicious npm packages and versions associated with the Shai-Hulud 2.0 supply chain attack.
Shai-Hulud NPM Package Malicious Exfiltration via Curl
Detects potential Shai Hulud NPM package attack attempting to exfiltrate data via curl to external webhook sites.
Shai-Hulud Malware Indicators - Windows
Detects potential Shai-Hulud malware indicators based on specific command line arguments associated with its execution.
Shai-Hulud Malicious Bun Execution
Detects the execution of `bun_environment.js` via the Bun runtime, a behavior associated with the Shai-Hulud "Second Coming" NPM supply chain attack. The malware uses a `setup_bun.js` script to install the Bun runtime if not present, and then executes the malicious `bun_environment.js` payload.
Shai-Hulud 2.0 Malicious NPM Package Installation
Detects the command-line installation of specific malicious npm packages and versions associated with the Shai-Hulud 2.0 supply chain attack.
Potential CVE-2026-33829 Exploitation - Windows Snipping Tool Remote File Path URI
Detects potential exploitation of CVE-2026-33829, a vulnerability in the Windows Snipping Tool URI handler (ms-screensketch:). An attacker can abuse the 'filePath' parameter to supply a UNC path or HTTP URL, causing SnippingTool.exe to initiate a connection to a remote resource. When a UNC path is used (e.g. \\attacker.com\share), this triggers an outbound NTLM authentication attempt, allowing the attacker to capture or relay the victim's Net-NTLMv2 hash. HTTP-based paths may result in remote file loading or server-side request forgery (SSRF)-style access. The URI can be delivered via a malicious hyperlink, phishing email, or web page.
RedSun - TieringEngineService.exe Staged in RS-Prefixed Temp Dir
Detects the creation of a file named TieringEngineService.exe inside a directory whose path contains the RS- prefix characteristic of RedSun's staging directory (e.g. %TEMP%\RS-{GUID}\TieringEngineService.exe). RedSun registers a Cloud Files sync root under this RS-prefixed path and drops a masqueraded placeholder there as part of its oplock-based AV bypass and privilege escalation chain. The RS-{GUID} directory name is generated by RedSun itself and has no legitimate system usage, making the combination of this path prefix and the TieringEngineService.exe filename a highly specific indicator of RedSun activity.
RedSun - Named Pipe Created
Detects the creation of a named pipe with the hardcoded name "REDSUN". The RedSun exploit tool uses a pipe with this name for synchronisation and command communication between its components during the Cloud Files API + oplock-based AV bypass and privilege escalation chain. RedSun creates the pipe as \\??\pipe\REDSUN. The pipe server listens for the token-duplicated elevated process to connect and respond, completing the privilege escalation from user to SYSTEM. Presence of this pipe name indicates active or recent RedSun execution.
RedSun - Conhost.exe Spawned by TieringEngineService.exe
Detects two stages of the RedSun post-exploitation process chain that deliver a SYSTEM-level shell to the attacker's interactive session. Observed process chain services.exe → TieringEngineService.exe → conhost.exe (SYSTEM, CommandLine: bare path, no arguments) → cmd.exe / shell (SYSTEM, TerminalSessionId = attacker's session) Stage 1 — TieringEngineService.exe spawns argument-less conhost.exe: After winning the oplock + Cloud Files mount point race, the malicious TieringEngineService.exe (RedSun.exe copied to System32, started via CoCreateInstance / services.exe) detects it is NT AUTHORITY\SYSTEM and calls LaunchConsoleInSessionId(). This opens \\.\pipe\REDSUN, reads the attacker's session ID, duplicates the SYSTEM token, re-stamps it with that session ID via SetTokenInformation(TokenSessionId), then calls CreateProcessAsUser to spawn conhost.exe with no arguments. Stage 2 — Shell spawned from rogue conhost.exe (EDR sources with GrandParentImage): The rogue SYSTEM conhost.exe spawns a shell (cmd.exe, PowerShell, etc.) as SYSTEM in the attacker's interactive session. On EDR sources that expose GrandParentImage, the full three-level chain (TieringEngineService.exe → conhost.exe → shell) can be matched directly. The legitimate TieringEngineService.exe is a headless COM server that is unlikely to spawn conhost.exe under normal conditions.
RedSun - TieringEngineService.exe Detected as EICAR Test File
Detects Windows Defender (EventID 1119 - Remediation Action Failed) flagging TieringEngineService.exe dropped in a characteristic RS-{GUID} temporary directory, or the RedSun.exe process itself being present. This covers the staging pattern used by RedSun, a Cloud Files API and opportunistic lock (oplock) based AV bypass/privilege escalation tool. RedSun works as follows: 1. Registers a Cloud Files sync root and creates a Cloud Files placeholder for TieringEngineService.exe under %TEMP%\RS-{GUID}\ 2. The placeholder file carries EICAR test file content (Virus:DOS/EICAR_Test_File) to reliably trigger a Defender scan and remediation attempt 3. Requests a batch oplock (FSCTL_REQUEST_BATCH_OPLOCK) on the placeholder file 4. When Defender attempts to scan/quarantine the file, the oplock triggers - holding the file open 5. During the oplock break window, RedSun swaps the mount point (junction) to redirect \\?\C:\Windows\System32 to the attacker-controlled temp path 6. This races the AV/OS into executing the malicious TieringEngineService.exe with elevated privileges
Axios NPM Compromise File Creation Indicators - Linux
Detects file creation events linked to the Axios NPM supply chain compromise. Axios is a popular JavaScript HTTP client. On March 30, 2026, malicious versions (1.14.1, 0.30.4) were published to npm, injecting a dependency (plain-crypto-js@4.2.1) that executed a postinstall script as a cross-platform RAT dropper.
Axios NPM Compromise File Creation Indicators - MacOS
Detects file creation events linked to the Axios NPM supply chain compromise on macOS devices. Axios is a popular JavaScript HTTP client. On March 30, 2026, malicious versions (1.14.1, 0.30.4) were published to npm, injecting a dependency (plain-crypto-js@4.2.1) that executed a postinstall script as a cross-platform RAT dropper.
Axios NPM Compromise File Creation Indicators - Windows
Detects file creation events linked to the Axios NPM supply chain compromise. Axios is a popular JavaScript HTTP client. On March 30, 2026, malicious versions (1.14.1, 0.30.4) were published to npm, injecting a dependency (plain-crypto-js@4.2.1) that executed a postinstall script as a cross-platform RAT dropper. The dropper contacted a C2 server, delivered platform-specific payloads, deleted itself, and replaced package.json to evade detection. The attack used cscript.exe (VBScript), curl.exe (C2), and PowerShell masquerading as Windows Terminal.
Axios NPM Compromise Malicious C2 Domain DNS Query
Detects DNS queries for the malicious C2 domain associated with the plain-crypto-js/Axios npm package supply chain compromise. On March 30, 2026, malicious versions (1.14.1, 0.30.4) were published to npm, injecting a dependency (plain-crypto-js@4.2.1) that executed a postinstall script as a cross-platform RAT dropper. This detection detects endpoints attempting to resolve the attacker's C2 domain (sfrclak.com) used for command and control communication.
Axios NPM Compromise Indicators - Linux
Detects the Linux-specific execution chain of the plain-crypto-js malicious npm dependency by Axios NPM package, including payload download via curl and detached execution using nohup and python3. On March 30, 2026, malicious versions (1.14.1, 0.30.4) were published to npm, injecting a dependency (plain-crypto-js@4.2.1) that executed a postinstall script as a cross-platform RAT dropper. The dropper contacted a C2 server, delivered platform-specific payloads, deleted itself, and replaced package.json to evade detection.