Sigma Rules
799 rules found for "Microsoft"
Change PowerShell Policies to an Insecure Level - PowerShell
Detects changing the PowerShell script execution policy to a potentially insecure level using the "Set-ExecutionPolicy" cmdlet.
Suspicious Eventlog Clear
Detects usage of known powershell cmdlets such as "Clear-EventLog" to clear the Windows event logs
Suspicious PowerShell Download - Powershell Script
Detects suspicious PowerShell download command
Password Policy Discovery With Get-AdDefaultDomainPasswordPolicy
Detetcts PowerShell activity in which Get-Addefaultdomainpasswordpolicy is used to get the default password policy for an Active Directory domain.
Suspicious GPO Discovery With Get-GPO
Detect use of Get-GPO to get one GPO or all the GPOs in a domain.
Suspicious Process Discovery With Get-Process
Get the processes that are running on the local computer.
Suspicious Hyper-V Cmdlets
Adversaries may carry out malicious operations using a virtual instance to avoid detection
Potential Keylogger Activity
Detects PowerShell scripts that contains reference to keystroke capturing functions
Suspicious Mount-DiskImage
Adversaries may abuse container files such as disk image (.iso, .vhd) file formats to deliver malicious payloads that may not be tagged with MOTW.
Suspicious New-PSDrive to Admin Share
Adversaries may use to interact with a remote network share using Server Message Block (SMB). The adversary may then perform actions as the logged-on user.
Suspicious Service DACL Modification Via Set-Service Cmdlet - PS
Detects usage of the "Set-Service" powershell cmdlet to configure a new SecurityDescriptor that allows a service to be hidden from other utilities such as "sc.exe", "Get-Service"...etc. (Works only in powershell 7)
Suspicious Start-Process PassThru
Powershell use PassThru option to start in background
Suspicious Unblock-File
Remove the Zone.Identifier alternate data stream which identifies the file as downloaded from the internet.
Tamper Windows Defender Remove-MpPreference - ScriptBlockLogging
Detects attempts to remove Windows Defender configuration using the 'MpPreference' cmdlet
Tamper Windows Defender - ScriptBlockLogging
Detects PowerShell scripts attempting to disable scheduled scanning and other parts of Windows Defender ATP or set default actions to allow.
Testing Usage of Uncommonly Used Port
Adversaries may communicate using a protocol and port paring that are typically not associated. For example, HTTPS over port 8088(Citation: Symantec Elfin Mar 2019) or port 587(Citation: Fortinet Agent Tesla April 2018) as opposed to the traditional port 443.
User Discovery And Export Via Get-ADUser Cmdlet - PowerShell
Detects usage of the Get-ADUser cmdlet to collect user information and output it to a file
Abuse of Service Permissions to Hide Services Via Set-Service - PS
Detects usage of the "Set-Service" powershell cmdlet to configure a new SecurityDescriptor that allows a service to be hidden from other utilities such as "sc.exe", "Get-Service"...etc. (Works only in powershell 7)
Potentially Suspicious Call To Win32_NTEventlogFile Class - PSScript
Detects usage of the WMI class "Win32_NTEventlogFile" in a potentially suspicious way (delete, backup, change permissions, etc.) from a PowerShell script
Windows Firewall Profile Disabled
Detects when a user disables the Windows Firewall via a Profile to help evade defense.
Winlogon Helper DLL
Winlogon.exe is a Windows component responsible for actions at logon/logoff as well as the secure attention sequence (SAS) triggered by Ctrl-Alt-Delete. Registry entries in HKLM\Software[Wow6432Node]Microsoft\Windows NT\CurrentVersion\Winlogon\ and HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\ are used to manage additional helper programs and functionalities that support Winlogon. Malicious modifications to these Registry keys may cause Winlogon to load and execute malicious DLLs and/or executables.
Suspicious X509Enrollment - Ps Script
Detect use of X509Enrollment
CMSTP Execution Process Access
Detects various indicators of Microsoft Connection Manager Profile Installer execution
Potentially Suspicious GrantedAccess Flags On LSASS
Detects process access requests to LSASS process with potentially suspicious access flags
LSASS Access From Potentially White-Listed Processes
Detects a possible process memory dump that uses a white-listed filename like TrolleyExpress.exe as a way to dump the LSASS process memory without Microsoft Defender interference
Uncommon Process Access Rights For Target Image
Detects process access request to uncommon target images with a "PROCESS_ALL_ACCESS" access mask.
Suspicious Process Access to LSASS with Dbgcore/Dbghelp DLLs
Detects suspicious process access to LSASS.exe from processes located in uncommon locations with dbgcore.dll or dbghelp.dll in the call trace. These DLLs contain functions like MiniDumpWriteDump that can be abused for credential dumping purposes. While modern tools like Mimikatz have moved to using ntdll.dll, dbgcore.dll and dbghelp.dll are still used by basic credential dumping utilities and legacy tools for LSASS memory access and process suspension techniques.
AgentExecutor PowerShell Execution
Detects execution of the AgentExecutor.exe binary. Which can be abused as a LOLBIN to execute powershell scripts with the ExecutionPolicy "Bypass" or any binary named "powershell.exe" located in the path provided by 6th positional argument
Suspicious AgentExecutor PowerShell Execution
Detects execution of the AgentExecutor.exe binary. Which can be abused as a LOLBIN to execute powershell scripts with the ExecutionPolicy "Bypass" or any binary named "powershell.exe" located in the path provided by 6th positional argument
Uncommon Child Process Of Appvlp.EXE
Detects uncommon child processes of Appvlp.EXE Appvlp or the Application Virtualization Utility is included with Microsoft Office. Attackers are able to abuse "AppVLP" to execute shell commands. Normally, this binary is used for Application Virtualization, but it can also be abused to circumvent the ASR file path rule folder or to mark a file as a system file.
Audit Policy Tampering Via Auditpol
Threat actors can use auditpol binary to change audit policy configuration to impair detection capability. This can be carried out by selectively disabling/removing certain audit policies as well as restoring a custom policy owned by the threat actor.
Windows EventLog Autologger Session Registry Modification Via CommandLine
Detects attempts to disable Windows EventLog autologger sessions via registry modification. The AutoLogger event tracing session records events that occur early in the operating system boot process. Applications and device drivers can use the AutoLogger session to capture traces before the user logs in. Adversaries may disable these sessions to evade detection and prevent security monitoring of early boot activities and system events.
Indirect Inline Command Execution Via Bash.EXE
Detects execution of Microsoft bash launcher with the "-c" flag. This can be used to potentially bypass defenses and execute Linux or Windows-based binaries directly via bash.
Indirect Command Execution From Script File Via Bash.EXE
Detects execution of Microsoft bash launcher without any flags to execute the content of a bash script directly. This can be used to potentially bypass defenses and execute Linux or Windows-based binaries directly via bash.
Potential Ransomware or Unauthorized MBR Tampering Via Bcdedit.EXE
Detects potential malicious and unauthorized usage of bcdedit.exe
Data Export From MSSQL Table Via BCP.EXE
Detects the execution of the BCP utility in order to export data from the database. Attackers were seen saving their malware to a database column or table and then later extracting it via "bcp.exe" into a file.
Suspicious Download From File-Sharing Website Via Bitsadmin
Detects usage of bitsadmin downloading a file from a suspicious domain
File Decoded From Base64/Hex Via Certutil.EXE
Detects the execution of certutil with either the "decode" or "decodehex" flags to decode base64 or hex encoded files. This can be abused by attackers to decode an encoded payload before execution
Suspicious Download Via Certutil.EXE
Detects the execution of certutil with certain flags that allow the utility to download files.
Suspicious File Downloaded From Direct IP Via Certutil.EXE
Detects the execution of certutil with certain flags that allow the utility to download files from direct IPs.
Suspicious File Downloaded From File-Sharing Website Via Certutil.EXE
Detects the execution of certutil with certain flags that allow the utility to download files from file-sharing websites.
File Encoded To Base64 Via Certutil.EXE
Detects the execution of certutil with the "encode" flag to encode a file to base64. This can be abused by threat actors and attackers for data exfiltration
Console CodePage Lookup Via CHCP
Detects use of chcp to look up the system locale value as part of host discovery
Suspicious CodePage Switch Via CHCP
Detects a code page switch in command line or batch scripts to a rare language
Data Copied To Clipboard Via Clip.EXE
Detects the execution of clip.exe in order to copy data to the clipboard. Adversaries may collect data stored in the clipboard from users copying information within or between applications.
Potential Reconnaissance For Cached Credentials Via Cmdkey.EXE
Detects usage of cmdkey to look for cached credentials on the system
Change Default File Association To Executable Via Assoc
Detects when a program changes the default file association of any extension to an executable. When a file is opened, the default program used to open the file (also called the file association or handler) is checked. File association selections are stored in the Windows Registry and can be edited by users, administrators, or programs that have Registry access or by administrators using the built-in assoc utility. Applications can modify the file association for a given file extension to call an arbitrary program when a file with the given extension is opened.
File Deletion Via Del
Detects execution of the builtin "del"/"erase" commands in order to delete files. Adversaries may delete files left behind by the actions of their intrusion activity. Malware, tools, or other non-native files dropped or created on a system by an adversary may leave traces to indicate to what was done within a network and how. Removal of these files can occur during an intrusion, or as part of a post-intrusion process to minimize the adversary's footprint.