Sigma Rules
239 rules found
Linux Doas Conf File Creation
Detects the creation of doas.conf file in linux host platform.
Persistence Via Cron Files
Detects creation of cron file or files in Cron directories which could indicates potential persistence.
Persistence Via Sudoers Files
Detects creation of sudoers file or files in "sudoers.d" directory which can be used a potential method to persiste privileges for a specific user.
Suspicious Filename with Embedded Base64 Commands
Detects files with specially crafted filenames that embed Base64-encoded bash payloads designed to execute when processed by shell scripts. These filenames exploit shell interpretation quirks to trigger hidden commands, a technique observed in VShell malware campaigns.
Potentially Suspicious Shell Script Creation in Profile Folder
Detects the creation of shell scripts under the "profile.d" path.
Triple Cross eBPF Rootkit Default LockFile
Detects the creation of the file "rootlog" which is used by the TripleCross rootkit as a way to check if the backdoor is already running.
Triple Cross eBPF Rootkit Default Persistence
Detects the creation of "ebpfbackdoor" files in both "cron.d" and "sudoers.d" directories. Which both are related to the TripleCross persistence method
Wget Creating Files in Tmp Directory
Detects the use of wget to download content in a temporary directory such as "/tmp" or "/var/tmp"
MacOS Emond Launch Daemon
Detects additions to the Emond Launch Daemon that adversaries may use to gain persistence and elevate privileges.
Startup Item File Created - MacOS
Detects the creation of a startup item plist file, that automatically get executed at boot initialization to establish persistence. Adversaries may use startup items automatically executed at boot initialization to establish persistence. Startup items execute during the final phase of the boot process and contain shell scripts or other executable files along with configuration information used by the system to determine the execution order for all startup items.
ADSI-Cache File Creation By Uncommon Tool
Detects the creation of an "Active Directory Schema Cache File" (.sch) file by an uncommon tool.
Advanced IP Scanner - File Event
Detects the use of Advanced IP Scanner. Seems to be a popular tool for ransomware groups.
Anydesk Temporary Artefact
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)
Suspicious Binary Writes Via AnyDesk
Detects AnyDesk writing binary files to disk other than "gcapi.dll". According to RedCanary research it is highly abnormal for AnyDesk to write executable files to disk besides gcapi.dll, which is a legitimate DLL that is part of the Google Chrome web browser used to interact with the Google Cloud API. (See reference section for more details)
Suspicious File Created by ArcSOC.exe
Detects instances where the ArcGIS Server process ArcSOC.exe, which hosts REST services running on an ArcGIS server, creates a file with suspicious file type, indicating that it may be an executable, script file, or otherwise unusual.
Assembly DLL Creation Via AspNetCompiler
Detects the creation of new DLL assembly files by "aspnet_compiler.exe", which could be a sign of "aspnet_compiler" abuse to proxy execution through a build provider.
BloodHound Collection Files
Detects default file names outputted by the BloodHound collection tool SharpHound
Potentially Suspicious File Creation by OpenEDR's ITSMService
Detects the creation of potentially suspicious files by OpenEDR's ITSMService process. The ITSMService is responsible for remote management operations and can create files on the system through the Process Explorer or file management features. While legitimate for IT operations, creation of executable or script files could indicate unauthorized file uploads, data staging, or malicious file deployment.
EVTX Created In Uncommon Location
Detects the creation of new files with the ".evtx" extension in non-common or non-standard location. This could indicate tampering with default EVTX locations in order to evade security controls or simply exfiltration of event log to search for sensitive information within. Note that backup software and legitimate administrator might perform similar actions during troubleshooting.
Creation Of Non-Existent System DLL
Detects creation of specific system DLL files that are usually not present on the system (or at least not in system directories) but may be loaded by legitimate processes. Phantom DLL hijacking involves placing malicious DLLs with names of non-existent system binaries in locations where legitimate applications may search for them, leading to execution of the malicious DLLs. Thus, the creation of such DLLs may indicate preparation for phantom DLL hijacking attacks.
Suspicious Deno File Written from Remote Source
Detects Deno writing a file from a direct HTTP(s) call and writing to the appdata folder or bringing it's own malicious DLL. This behavior may indicate an attempt to execute remotely hosted, potentially malicious files through deno.
New Custom Shim Database Created
Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by application shims. The Microsoft Windows Application Compatibility Infrastructure/Framework (Application Shim) was created to allow for backward compatibility of software as the operating system codebase changes over time.
Suspicious Screensaver Binary File Creation
Adversaries may establish persistence by executing malicious content triggered by user inactivity. Screensavers are programs that execute after a configurable time of user inactivity and consist of Portable Executable (PE) files with a .scr file extension
Files With System DLL Name In Unsuspected Locations
Detects the creation of a file with the ".dll" extension that has the name of a System DLL in uncommon or unsuspected locations. (Outisde of "System32", "SysWOW64", etc.). It is highly recommended to perform an initial baseline before using this rule in production.
Files With System Process Name In Unsuspected Locations
Detects the creation of an executable with a system process name in folders other than the system ones (System32, SysWOW64, etc.). It is highly recommended to perform an initial baseline before using this rule in production.
Creation Exe for Service with Unquoted Path
Adversaries may execute their own malicious payloads by hijacking vulnerable file path references. Adversaries can take advantage of paths that lack surrounding quotations by placing an executable in a higher level directory within the path, so that Windows will choose the adversary's executable to launch.
Cred Dump Tools Dropped Files
Files with well-known filenames (parts of credential dump software or files produced by them) creation
WScript or CScript Dropper - File
Detects a file ending in jse, vbe, js, vba, vbs written by cscript.exe or wscript.exe
CSExec Service File Creation
Detects default CSExec service filename which indicates CSExec service installation and execution
Dynamic CSharp Compile Artefact
When C# is compiled dynamically, a .cmdline file will be created as a part of the process. Certain processes are not typically observed compiling C# code, but can do so without touching disk. This can be used to unpack a payload for execution
Potential DCOM InternetExplorer.Application DLL Hijack
Detects potential DLL hijack of "iertutil.dll" found in the DCOM InternetExplorer.Application Class over the network
Desktop.INI Created by Uncommon Process
Detects unusual processes accessing desktop.ini, which can be leveraged to alter how Explorer displays a folder's content (i.e. renaming files) without changing them on disk.
DLL Search Order Hijackig Via Additional Space in Path
Detects when an attacker create a similar folder structure to windows system folders such as (Windows, Program Files...) but with a space in order to trick DLL load search order and perform a "DLL Search Order Hijacking" attack
Potentially Suspicious DMP/HDMP File Creation
Detects the creation of a file with the ".dmp"/".hdmp" extension by a shell or scripting application such as "cmd", "powershell", etc. Often created by software during a crash. Memory dumps can sometimes contain sensitive information such as credentials. It's best to determine the source of the crash.
Potential Persistence Attempt Via ErrorHandler.Cmd
Detects creation of a file named "ErrorHandler.cmd" in the "C:\WINDOWS\Setup\Scripts\" directory which could be used as a method of persistence The content of C:\WINDOWS\Setup\Scripts\ErrorHandler.cmd is read whenever some tools under C:\WINDOWS\System32\oobe\ (e.g. Setup.exe) fail to run for any reason.
Suspicious ASPX File Drop by Exchange
Detects suspicious file type dropped by an Exchange component in IIS into a suspicious folder
Suspicious File Drop by Exchange
Detects suspicious file type dropped by an Exchange component in IIS
GoToAssist Temporary Installation Artefact
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)
Uncommon File Created by Notepad++ Updater Gup.EXE
Detects when the Notepad++ updater (gup.exe) creates files in suspicious or uncommon locations. This could indicate potential exploitation of the updater component to deliver unwanted malware or unwarranted files.
HackTool - CrackMapExec File Indicators
Detects file creation events with filename patterns used by CrackMapExec.
HackTool - Dumpert Process Dumper Default File
Detects the creation of the default dump file used by Outflank Dumpert tool. A process dumper, which dumps the lsass process memory
HackTool - Typical HiveNightmare SAM File Export
Detects files written by the different tools that exploit HiveNightmare
HackTool - Inveigh Execution Artefacts
Detects the presence and execution of Inveigh via dropped artefacts
HackTool - RemoteKrbRelay SMB Relay Secrets Dump Module Indicators
Detects the creation of file with specific names used by RemoteKrbRelay SMB Relay attack module.
HackTool - Mimikatz Kirbi File Creation
Detects the creation of files created by mimikatz such as ".kirbi", "mimilsa.log", etc.
HackTool - NPPSpy Hacktool Usage
Detects the use of NPPSpy hacktool that stores cleartext passwords of users that logged in to a local file
HackTool - Powerup Write Hijack DLL
Powerup tool's Write Hijack DLL exploits DLL hijacking for privilege escalation. In it's default mode, it builds a self deleting .bat file which executes malicious command. The detection rule relies on creation of the malicious bat file (debug.bat by default).
HackTool - QuarksPwDump Dump File
Detects a dump file written by QuarksPwDump password dumper