Sigma Rules
1,414 rules found for "Nextron Systems"
Potential ShellDispatch.DLL Sideloading
Detects potential DLL sideloading of "ShellDispatch.dll"
DLL Sideloading Of ShellChromeAPI.DLL
Detects processes loading the non-existent DLL "ShellChromeAPI". One known example is the "DeviceEnroller" binary in combination with the "PhoneDeepLink" flag tries to load this DLL. Adversaries can drop their own renamed DLL and execute it via DeviceEnroller.exe using this parameter
Potential SmadHook.DLL Sideloading
Detects potential DLL sideloading of "SmadHook.dll", a DLL used by SmadAV antivirus
Potential SolidPDFCreator.DLL Sideloading
Detects potential DLL sideloading of "SolidPDFCreator.dll"
Third Party Software DLL Sideloading
Detects DLL sideloading of DLLs that are part of third party software (zoom, discord....etc)
Potential Vcruntime140 DLL Sideloading
Detects potential DLL sideloading of vcruntime140.dll, a common C++ runtime library. Threat actors have been observed using DLL sideloading techniques to load malicious payloads under the guise of legitimate applications such as SqlWriter, SqlDumper etc. Notably, APT29 has been documented leveraging WinELOADER to sideload vcruntime140.dll for executing malicious code.
Potential Vivaldi_elf.DLL Sideloading
Detects potential DLL sideloading of "vivaldi_elf.dll"
VMGuestLib DLL Sideload
Detects DLL sideloading of VMGuestLib.dll by the WmiApSrv service.
VMMap Signed Dbghelp.DLL Potential Sideloading
Detects potential DLL sideloading of a signed dbghelp.dll by the Sysinternals VMMap.
VMMap Unsigned Dbghelp.DLL Potential Sideloading
Detects potential DLL sideloading of an unsigned dbghelp.dll by the Sysinternals VMMap.
Potential DLL Sideloading Via VMware Xfer
Detects loading of a DLL by the VMware Xfer utility from the non-default directory which may be an attempt to sideload arbitrary DLL
Potential Waveedit.DLL Sideloading
Detects potential DLL sideloading of "waveedit.dll", which is part of the Nero WaveEditor audio editing software.
Potential Wazuh Security Platform DLL Sideloading
Detects potential DLL side loading of DLLs that are part of the Wazuh security platform
Potential WWlib.DLL Sideloading
Detects potential DLL sideloading of "wwlib.dll"
BaaUpdate.exe Suspicious DLL Load
Detects BitLocker Access Agent Update Utility (baaupdate.exe) loading DLLs from suspicious locations that are publicly writable which could indicate an attempt to lateral movement via BitLocker DCOM & COM Hijacking. This technique abuses COM Classes configured as INTERACTIVE USER to spawn processes in the context of the logged-on user's session. Specifically, it targets the BDEUILauncher Class (CLSID ab93b6f1-be76-4185-a488-a9001b105b94) which can launch BaaUpdate.exe, which is vulnerable to COM Hijacking when started with input parameters. This allows attackers to execute code in the user's context without needing to steal credentials or use additional techniques to compromise the account.
DLL Load By System Process From Suspicious Locations
Detects when a system process (i.e. located in system32, syswow64, etc.) loads a DLL from a suspicious location or a location with permissive permissions such as "C:\Users\Public"
Suspicious Unsigned Thor Scanner Execution
Detects loading and execution of an unsigned thor scanner binary.
UAC Bypass Using Iscsicpl - ImageLoad
Detects the "iscsicpl.exe" UAC bypass technique that leverages a DLL Search Order hijacking technique to load a custom DLL's from temp or a any user controlled location in the users %PATH%
MMC Loading Script Engines DLLs
Detects when the Microsoft Management Console (MMC) loads the DLL libraries like vbscript, jscript etc which might indicate an attempt to execute malicious scripts within a trusted system process for bypassing application whitelisting or defense evasion.
Suspicious Loading of Dbgcore/Dbghelp DLLs from Uncommon Location
Detects loading of dbgcore.dll or dbghelp.dll from uncommon locations such as user directories. These DLLs contain the MiniDumpWriteDump function, which can be abused for credential dumping purposes or in some cases for evading EDR/AV detection by suspending processes.
Trusted Path Bypass via Windows Directory Spoofing
Detects DLLs loading from a spoofed Windows directory path with an extra space (e.g "C:\Windows \System32") which can bypass Windows trusted path verification. This technique tricks Windows into treating the path as trusted, allowing malicious DLLs to load with high integrity privileges bypassing UAC.
Uncommon Network Connection Initiated By Certutil.EXE
Detects a network connection initiated by the certutil.exe utility. Attackers can abuse the utility in order to download malware or additional payloads.
Outbound Network Connection Initiated By Cmstp.EXE
Detects a network connection initiated by Cmstp.EXE Its uncommon for "cmstp.exe" to initiate an outbound network connection. Investigate the source of such requests to determine if they are malicious.
Network Connection Initiated To AzureWebsites.NET By Non-Browser Process
Detects an initiated network connection by a non browser process on the system to "azurewebsites.net". The latter was often used by threat actors as a malware hosting and exfiltration site.
Network Connection Initiated To Cloudflared Tunnels Domains
Detects network connections to Cloudflared tunnels domains initiated by a process on the system. Attackers can abuse that feature to establish a reverse shell or persistence on a machine.
Network Communication With Crypto Mining Pool
Detects initiated network connections to crypto mining pools
New Connection Initiated To Potential Dead Drop Resolver Domain
Detects an executable, which is not an internet browser or known application, initiating network connections to legit popular websites, which were seen to be used as dead drop resolvers in previous attacks. In this context attackers leverage known websites such as "facebook", "youtube", etc. In order to pass through undetected.
Suspicious Dropbox API Usage
Detects an executable that isn't dropbox but communicates with the Dropbox API
Suspicious Network Connection to IP Lookup Service APIs
Detects external IP address lookups by non-browser processes via services such as "api.ipify.org". This could be indicative of potential post compromise internet test activity.
Network Connection Initiated To Mega.nz
Detects a network connection initiated by a binary to "api.mega.co.nz". Attackers were seen abusing file sharing websites similar to "mega.nz" in order to upload/download additional payloads.
Process Initiated Network Connection To Ngrok Domain
Detects an executable initiating a network connection to "ngrok" domains. Attackers were seen using this "ngrok" in order to store their second stage payloads and malware. While communication with such domains can be legitimate, often times is a sign of either data exfiltration by malicious actors or additional download.
Communication To Ngrok Tunneling Service Initiated
Detects an executable initiating a network connection to "ngrok" tunneling domains. Attackers were seen using this "ngrok" in order to store their second stage payloads and malware. While communication with such domains can be legitimate, often times is a sign of either data exfiltration by malicious actors or additional download.
Network Communication Initiated To Portmap.IO Domain
Detects an executable accessing the portmap.io domain, which could be a sign of forbidden C2 traffic or data exfiltration by malicious actors
Suspicious Non-Browser Network Communication With Telegram API
Detects an a non-browser process interacting with the Telegram API which could indicate use of a covert C2
Network Connection Initiated By Eqnedt32.EXE
Detects network connections from the Equation Editor process "eqnedt32.exe".
Network Connection Initiated via Finger.EXE
Detects network connections via finger.exe, which can be abused by threat actors to retrieve remote commands for execution on Windows devices. In one ClickFix malware campaign, adversaries leveraged the finger protocol to fetch commands from a remote server. Since the finger utility is not commonly used in modern Windows environments, its presence already raises suspicion. Investigating such network connections can also help identify potential malicious infrastructure used by threat actors
Office Application Initiated Network Connection To Non-Local IP
Detects an office application (Word, Excel, PowerPoint) that initiate a network connection to a non-private IP addresses. This rule aims to detect traffic similar to one seen exploited in CVE-2021-42292. This rule will require an initial baseline and tuning that is specific to your organization.
Office Application Initiated Network Connection Over Uncommon Ports
Detects an office suit application (Word, Excel, PowerPoint, Outlook) communicating to target systems over uncommon ports.
RDP to HTTP or HTTPS Target Ports
Detects svchost hosting RDP termsvcs communicating to target systems on TCP port 80 or 443
Rundll32 Internet Connection
Detects a rundll32 that communicates with public IP addresses
Suspicious Network Connection Binary No CommandLine
Detects suspicious network connections made by a well-known Windows binary run with no command line parameters
Network Communication Initiated To File Sharing Domains From Process Located In Suspicious Folder
Detects executables located in potentially suspicious directories initiating network connections towards file sharing domains.
Network Connection Initiated From Process Located In Potentially Suspicious Or Uncommon Location
Detects a network connection initiated by programs or processes running from suspicious or uncommon files system locations.
Potentially Suspicious Malware Callback Communication
Detects programs that connect to known malware callback ports based on statistical analysis from two different sandbox system databases
Communication To Uncommon Destination Ports
Detects programs that connect to uncommon destination ports
Suspicious Wordpad Outbound Connections
Detects a network connection initiated by "wordpad.exe" over uncommon destination ports. This might indicate potential process injection activity from a beacon or similar mechanisms.
Outbound Network Connection Initiated By Script Interpreter
Detects a script interpreter wscript/cscript opening a network connection to a non-local network. Adversaries may use script to download malicious payloads.
CobaltStrike Named Pipe
Detects the creation of a named pipe as used by CobaltStrike