Sigma Rules
477 rules found for "François Hubaut"
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
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)
Installation of TeamViewer Desktop
TeamViewer_Desktop.exe is create during install
Malicious DLL File Dropped in the Teams or OneDrive Folder
Detects creation of a malicious DLL file in the location where the OneDrive or Team applications Upon execution of the Teams or OneDrive application, the dropped malicious DLL file ("iphlpapi.dll") is sideloaded
Suspicious DotNET CLR Usage Log Artifact
Detects the creation of Usage Log files by the CLR (clr.dll). These files are named after the executing process once the assembly is finished executing for the first time in the (user) session context.
Office Macro File Creation From Suspicious Process
Detects the creation of a office macro file from a a suspicious process
Uncommon File Created In Office Startup Folder
Detects the creation of a file with an uncommon extension in an Office application startup folder
Potential Binary Or Script Dropper Via PowerShell
Detects PowerShell creating a binary executable or a script file.
PowerShell Script Dropped Via PowerShell.EXE
Detects PowerShell creating a PowerShell file (.ps1). While often times this behavior is benign, sometimes it can be a sign of a dropper script trying to achieve persistence.
ScreenConnect 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)
Suspicious Creation with Colorcpl
Once executed, colorcpl.exe will copy the arbitrary file to c:\windows\system32\spool\drivers\color\
Creation of a Diagcab
Detects the creation of diagcab file, which could be caused by some legitimate installer or is a sign of exploitation (review the filename and its location)
Suspicious Double Extension Files
Detects dropped files with double extensions, which is often used by malware as a method to abuse the fact that Windows hide default extensions by default.
Suspicious Executable File Creation
Detect creation of suspicious executable file names. Some strings look for suspicious file extensions, others look for filenames that exploit unquoted service paths.
Suspicious Get-Variable.exe Creation
Get-Variable is a valid PowerShell cmdlet WindowsApps is by default in the path where PowerShell is executed. So when the Get-Variable command is issued on PowerShell execution, the system first looks for the Get-Variable executable in the path and executes the malicious binary instead of looking for the PowerShell cmdlet.
Legitimate Application Dropped Archive
Detects programs on a Windows system that should not write an archive to disk
Legitimate Application Dropped Executable
Detects programs on a Windows system that should not write executables to disk
Legitimate Application Dropped Script
Detects programs on a Windows system that should not write scripts to disk
Suspicious LNK Double Extension File Created
Detects the creation of files with an "LNK" as a second extension. This is sometimes used by malware as a method to abuse the fact that Windows hides the "LNK" extension by default.
Windows Terminal Profile Settings Modification By Uncommon Process
Detects the creation or modification of the Windows Terminal Profile settings file "settings.json" by an uncommon process.
VHD Image Download Via Browser
Detects creation of ".vhd"/".vhdx" files by browser processes. Malware can use mountable Virtual Hard Disk ".vhd" files to encapsulate payloads and evade security controls.
Creation of WerFault.exe/Wer.dll in Unusual Folder
Detects the creation of a file named "WerFault.exe" or "wer.dll" in an uncommon folder, which could be a sign of WerFault DLL hijacking.
Writing Local Admin Share
Aversaries may use to interact with a remote network share using Server Message Block (SMB). This technique is used by post-exploitation frameworks.
Suspicious Appended Extension
Detects file renames where the target filename uses an uncommon double extension. Could indicate potential ransomware activity renaming files and adding a custom extension to the encrypted files, such as ".jpg.crypted", ".docx.locky", etc.
Suspicious Volume Shadow Copy Vssapi.dll Load
Detects the image load of VSS DLL by uncommon executables
Potentially Suspicious Volume Shadow Copy Vsstrace.dll Load
Detects the image load of VSS DLL by uncommon executables
Potential DLL Sideloading Via ClassicExplorer32.dll
Detects potential DLL sideloading using ClassicExplorer32.dll from the Classic Shell software
Potential DLL Sideloading Using Coregen.exe
Detect usage of the "coregen.exe" (Microsoft CoreCLR Native Image Generator) binary to sideload arbitrary DLLs.
Potential DLL Sideloading Via JsSchHlp
Detects potential DLL sideloading using JUSTSYSTEMS Japanese word processor
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.
Network Connection Initiated By IMEWDBLD.EXE
Detects a network connection initiated by IMEWDBLD.EXE. This might indicate potential abuse of the utility as a LOLBIN in order to download arbitrary files or additional payloads.
Python Initiated Connection
Detects a Python process initiating a network connection. While this often relates to package installation, it can also indicate a potential malicious script communicating with a C&C server.
RegAsm.EXE Initiating Network Connection To Public IP
Detects "RegAsm.exe" initiating a network connection to public IP adresses
Suspicious Outbound SMTP Connections
Adversaries may steal data by exfiltrating it over an un-encrypted network protocol other than that of the existing command and control channel. The data may also be sent to an alternate network location from the main command and control server.
Local Network Connection Initiated By Script Interpreter
Detects a script interpreter (Wscript/Cscript) initiating a local network connection to download or execute a script hosted on a shared folder.
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.
Delete Volume Shadow Copies Via WMI With PowerShell
Shadow Copies deletion using operating systems utilities via PowerShell
Netcat The Powershell Version
Adversaries may use a non-application layer protocol for communication between host and C2 server or among infected hosts within a network
Potential RemoteFXvGPUDisablement.EXE Abuse
Detects PowerShell module creation where the module Contents are set to "function Get-VMRemoteFXPhysicalVideoAdapter". This could be a sign of potential abuse of the "RemoteFXvGPUDisablement.exe" binary which is known to be vulnerable to module load-order hijacking.
Renamed Powershell Under Powershell Channel
Detects a renamed Powershell execution, which is a common technique used to circumvent security controls and bypass detection logic that's dependent on process names and process paths.
Use Get-NetTCPConnection
Adversaries may attempt to get a listing of network connections to or from the compromised system they are currently accessing or from remote systems by querying for information over the network.
Zip A Folder With PowerShell For Staging In Temp - PowerShell
Detects PowerShell scripts that make use of the "Compress-Archive" Cmdlet in order to compress folders and files where the output is stored in a potentially suspicious location that is used often by malware for exfiltration. An adversary might compress data (e.g., sensitive documents) that is collected prior to exfiltration in order to make it portable and minimize the amount of data sent over the network.
Tamper Windows Defender - PSClassic
Attempting to disable scheduled scanning and other parts of Windows Defender ATP or set default actions to allow.
Potential Active Directory Enumeration Using AD Module - PsModule
Detects usage of the "Import-Module" cmdlet to load the "Microsoft.ActiveDirectory.Management.dl" DLL. Which is often used by attackers to perform AD enumeration.
Malicious PowerShell Scripts - PoshModule
Detects the execution of known offensive powershell scripts used for exploitation or reconnaissance
Potential RemoteFXvGPUDisablement.EXE Abuse - PowerShell Module
Detects PowerShell module creation where the module Contents are set to "function Get-VMRemoteFXPhysicalVideoAdapter". This could be a sign of potential abuse of the "RemoteFXvGPUDisablement.exe" binary which is known to be vulnerable to module load-order hijacking.
AD Groups Or Users Enumeration Using PowerShell - PoshModule
Adversaries may attempt to find domain-level groups and permission settings. The knowledge of domain-level permission groups can help adversaries determine which groups exist and which users belong to a particular group. Adversaries may use this information to determine which users have elevated permissions, such as domain administrators.
Use Get-NetTCPConnection - PowerShell Module
Adversaries may attempt to get a listing of network connections to or from the compromised system they are currently accessing or from remote systems by querying for information over the network.