Sigma Rules
174 rules found
DarkSide Ransomware Pattern
Detects DarkSide Ransomware and helpers
FoggyWeb Backdoor DLL Loading
Detects DLL hijacking technique used by NOBELIUM in their FoggyWeb backdoor. Which loads a malicious version of the expected "version.dll" dll
Goofy Guineapig Backdoor Service Creation
Detects service creation persistence used by the Goofy Guineapig backdoor
Moriya Rootkit File Created
Detects the creation of a file named "MoriyaStreamWatchmen.sys" in a specific location. This filename was reported to be related to the Moriya rootkit as described in the securelist's Operation TunnelSnake report.
Small Sieve Malware Potential C2 Communication
Detects potential C2 communication related to Small Sieve malware
HAFNIUM Exchange Exploitation Activity
Detects activity observed by different researchers to be HAFNIUM group activity (or related) on Exchange servers
REvil Kaseya Incident Malware Patterns
Detects process command line patterns and locations used by REvil group in Kaseya incident (can also match on other malware)
OWASSRF Exploitation Attempt Using Public POC - Proxy
Detects exploitation attempt of the OWASSRF variant targeting exchange servers using publicly available POC. It uses the OWA endpoint to access the powershell backend endpoint
OWASSRF Exploitation Attempt Using Public POC - Webserver
Detects exploitation attempt of the OWASSRF variant targeting exchange servers using publicly available POC. It uses the OWA endpoint to access the powershell backend endpoint
CVE-2023-23397 Exploitation Attempt
Detects outlook initiating connection to a WebDAV or SMB share, which could be a sign of CVE-2023-23397 exploitation.
Potential CVE-2023-36884 Exploitation Pattern
Detects a unique pattern seen being used by RomCom potentially exploiting CVE-2023-36884
COLDSTEEL RAT Cleanup Command Execution
Detects the creation of a "rundll32" process from the ColdSteel persistence service to initiate the cleanup command by calling one of its own exports. This functionality is not present in "MileStone2017" and some "MileStone2016" samples
COLDSTEEL RAT Service Persistence Execution
Detects the creation of an "svchost" process with specific command line flags, that were seen present and used by ColdSteel RAT
Griffon Malware Attack Pattern
Detects process execution patterns related to Griffon malware as reported by Kaspersky
Qakbot Rundll32 Exports Execution
Detects specific process tree behavior of a "rundll32" execution with exports linked with Qakbot activity.
Qakbot Rundll32 Fake DLL Extension Execution
Detects specific process tree behavior of a "rundll32" execution where the DLL doesn't have the ".dll" extension. This is often linked with potential Qakbot activity.
Rorschach Ransomware Execution Activity
Detects Rorschach ransomware execution activity
SNAKE Malware Kernel Driver File Indicator
Detects SNAKE malware kernel driver file indicator
SNAKE Malware Service Persistence
Detects the creation of a service named "WerFaultSvc" which seems to be used by the SNAKE malware as a persistence mechanism as described by CISA in their report
Malicious DLL Load By Compromised 3CXDesktopApp
Detects DLL load activity of known compromised DLLs used in by the compromised 3CXDesktopApp
Diamond Sleet APT Scheduled Task Creation
Detects registry event related to the creation of a scheduled task used by Diamond Sleet APT during exploitation of Team City CVE-2023-42793 vulnerability
Mint Sandstorm - AsperaFaspex Suspicious Process Execution
Detects suspicious execution from AsperaFaspex as seen used by Mint Sandstorm
Mint Sandstorm - ManageEngine Suspicious Process Execution
Detects suspicious execution from ManageEngine as seen used by Mint Sandstorm
UNC4841 - Potential SEASPY Execution
Detects execution of specific named binaries which were used by UNC4841 to deploy their SEASPY backdoor
CVE-2024-1708 - ScreenConnect Path Traversal Exploitation - Security
This detects file modifications to ASPX and ASHX files within the root of the App_Extensions directory, which is allowed by a ZipSlip vulnerability in versions prior to 23.9.8. This occurs during exploitation of CVE-2024-1708. This requires an Advanced Auditing policy to log a successful Windows Event ID 4663 events and with a SACL set on the directory.
CVE-2024-1709 - ScreenConnect Authentication Bypass Exploitation
Detects GET requests to '/SetupWizard.aspx/[anythinghere]' that indicate exploitation of the ScreenConnect vulnerability CVE-2024-1709.
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.
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 - 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