chore: change tags, date, modified fields to comply with v2 of the Sigma spec.
chore: update the related type from `obsoletes` to `obsolete`.
chore: update local json schema to the latest version.
fix: Powershell Token Obfuscation - Powershell - Changed to not use Lookahead regex
fix: Powershell Token Obfuscation - Process Creation - Changed to not use Lookahead regex
---------
Co-authored-by: nasbench <8741929+nasbench@users.noreply.github.com>
fix: Dllhost.EXE Initiated Network Connection To Non-Local IP Address - Filter out additional Microsoft IP block and moved to the threat hunting folder due to large amount of matches based on VT data
fix: Forest Blizzard APT - File Creation Activity - Fix typo in filename
fix: New RUN Key Pointing to Suspicious Folder - Enhance filter to fix new false positive found in testing
new: COM Object Hijacking Via Modification Of Default System CLSID Default Value
new: CVE-2023-1389 Potential Exploitation Attempt - Unauthenticated Command Injection In TP-Link Archer AX21
new: DPAPI Backup Keys And Certificate Export Activity IOC
new: DSInternals Suspicious PowerShell Cmdlets
new: DSInternals Suspicious PowerShell Cmdlets - ScriptBlock
new: HackTool - RemoteKrbRelay Execution
new: HackTool - RemoteKrbRelay SMB Relay Secrets Dump Module Indicators
new: HackTool - SharpDPAPI Execution
new: Hypervisor Enforced Paging Translation Disabled
new: PDF File Created By RegEdit.EXE
new: Periodic Backup For System Registry Hives Enabled
new: Renamed Microsoft Teams Execution
new: Windows LAPS Credential Dump From Entra ID
remove: Potential Persistence Via COM Hijacking From Suspicious Locations - Deprecated because of incorrect logic, replaced by "790317c0-0a36-4a6a-a105-6e576bf99a14"
update: DLL Call by Ordinal Via Rundll32.EXE - Reduced level to "medium" and moved to the threat hunting folder due to the fact that calling by ordinal can be seen by many legitimate utilities. An initial baseline needs to be set for the rule to be promoted.
update: Msiexec.EXE Initiated Network Connection Over HTTP - Reduced level to low and moved to the threat hunting folder due to large amount of matches based on VT data
update: MSSQL Add Account To Sysadmin Role - Update the "Provider_Name" to use a contains in order to account for other third party providers.
update: MSSQL Disable Audit Settings - Update the "Provider_Name" to use a contains in order to account for other third party providers.
update: MSSQL Server Failed Logon - Update the "Provider_Name" to use a contains in order to account for other third party providers.
update: MSSQL Server Failed Logon From External Network - Update the "Provider_Name" to use a contains in order to account for other third party providers.
update: MSSQL SPProcoption Set - Update the "Provider_Name" to use a contains in order to account for other third party providers.
update: MSSQL XPCmdshell Option Change - Update the "Provider_Name" to use a contains in order to account for other third party providers.
update: MSSQL XPCmdshell Suspicious Execution - Update the "Provider_Name" to use a contains in order to account for other third party providers.
update: Network Connection Initiated By AddinUtil.EXE - increase level to "high" and promote the status to "test" based on VT data
update: Network Connection Initiated To AzureWebsites.NET By Non-Browser Process - Reduced the level to "medium" and added filters for "null" and empty values based on VT data
update: Office Application Initiated Network Connection Over Uncommon Ports - Add port "143" based on Microsoft "Microsoft 365 URLs and IP address ranges" document
update: Office Application Initiated Network Connection To Non-Local IP - Add "outlook.exe" to the list of processes and filter multiple IP ranges based on Microsoft "Microsoft 365 URLs and IP address ranges" document
update: Password Protected Compressed File Extraction Via 7Zip - Reduced level to "low" and moved to the threat hunting folder due to large amount of matches based on VT data
update: Potential Dead Drop Resolvers - Add filters for "null" and empty values based on VT data
update: Potential Privilege Escalation via Local Kerberos Relay over LDAP - Update metadata information
update: Potential Shellcode Injection - Reduced level to "medium" and moved to the threat hunting folder due multiple FP with third party softwares
update: Potential Suspicious Execution From GUID Like Folder Names - Reduced level to "low" and moved to the threat hunting folder
update: Potentially Suspicious EventLog Recon Activity Using Log Query Utilities - Add additional EventLog and ETW providers to increase coverage
update: Potentially Suspicious Execution From Parent Process In Public Folder - Update logic to add Image names in addition to the previous CommandLines
update: Potentially Suspicious PowerShell Child Processes - Reduced level to "medium" and moved to the threat hunting folder due to large amount of matches based on VT data. As well as the logic doesn't look for anything suspicious but "child processes" that might be "uncommon".
update: Process Execution From A Potentially Suspicious Folder - Update metadata and remove "\Users\Public" to avoid false positives
update: Recon Command Output Piped To Findstr.EXE - Update the logic to user "wildcards" instead of spaces to cover different variants and increase the coverage.
update: Suspicious Electron Application Child Processes - Remove unnecessary filters
update: Suspicious Non-Browser Network Communication With Google API - Add filters for "null" and empty values based on VT data
update: System File Execution Location Anomaly - Enhance filters
update: Uncommon Child Process Of Setres.EXE - Update logic and metadata
update: Uncommon Link.EXE Parent Process - Enhance the filters and metadata
update: Windows Defender Threat Detection Service Disabled - Add french keyword for "stopped" to increase coverage for windows os that uses the french language
---------
Thanks: cY83rR0H1t
Thanks: CTI-Driven
Thanks: BIitzkrieg
Thanks: DFIR-jwedd
Thanks: Snp3r
chore: update Microsoft references link to use the "learn" subdomain instead of "docs".
---------
Co-authored-by: nasbench <8741929+nasbench@users.noreply.github.com>
Thanks: @ryanplasma
fix: Kerberos Manipulation - Update field to use Status instead of incorrect "FailureCode"
fix: Metasploit SMB Authentication - Remove unnecessary field
fix: Service Installation in Suspicious Folder - Update FP filter
update: Malicious PowerShell Commandlets - ProcessCreation - "Start-Dnscat2"
remove: Dnscat Execution - Deprecated in favour of an integration in the "Malicious PowerShell Cmdlet" type of rules
remove: SAM Dump to AppData
update: Critical Hive In Suspicious Location Access Bits Cleared - Enhance metadata and logic
update: Malicious PowerShell Commandlets - PoshModule - "Start-Dnscat2"
update: Malicious PowerShell Commandlets - ScriptBlock - "Start-Dnscat2"
update: Malicious PowerShell Scripts - FileCreation - Add "dnscat2.ps1"
update: Malicious PowerShell Scripts - PoshModule - Add "dnscat2.ps1"
update: Monitoring For Persistence Via BITS - Use "Image" and "OriginalFileName" fields instead of CLI only
update: New or Renamed User Account with '$' Character - Reduced level to "medium"
update: New Process Created Via Taskmgr.EXE - Added full paths to the filtered binaries to decrease false negatives
update: Potential Dropper Script Execution Via WScript/CScript - Re-wrote the logic by removing the paths "C:\Users" and "C:\ProgramData". As these are very common and will generate high FP rate. Instead switched the paths to a more robust list and extended the list of extension covered. Also reduced the level to "medium"
update: Potential Fake Instance Of Hxtsr.EXE Executed - Remove "C:" prefix from detection logic
update: Prefetch File Deleted - Update selection to remove 'C:' prefix
update: Sensitive File Access Via Volume Shadow Copy Backup - Made the rule more generic by updating the title and removing the IOC from conti. (will be added in a dedicated rule)
update: Shell Process Spawned by Java.EXE - Add "bash.exe"
update: Suspicious PowerShell Download - Powershell Script - Add "DownloadFileAsync" and "DownloadStringAsync" functions
update: Suspicious Processes Spawned by Java.EXE - Remove "bash.exe" as its doesn't fit the logic
update: Sysmon Application Crashed - Add 32bit version of sysmon binary
update: Tap Driver Installation - Security - Reduce level to "low"
update: Write Protect For Storage Disabled - Remove "storagedevicepolicies" as the string "storage" already covers it
---------
Co-authored-by: phantinuss <79651203+phantinuss@users.noreply.github.com>
fix: Firewall Rule Modified In The Windows Firewall Exception List - new optional filter Brave browser
fix: Outbound RDP Connections Over Non-Standard Tools - new FP filter for RAS TSplus
fix: PowerShell Core DLL Loaded By Non PowerShell Process - new optional filter for chocolatey
fix: Remote Thread Creation In Mstsc.Exe From Suspicious Location - Fix a broken path string
fix: Remote Thread Creation In Uncommon Target Image - Reduce level to medium and remove explorer as target due to FP rates.
fix: Uncommon New Firewall Rule Added In Windows Firewall Exception List - Fix the filters to be more generic
new: Rare Remote Thread Creation By Uncommon Source Image - A split of 66d31e5f-52d6-40a4-9615-002d3789a119
update: All Rules Have Been Deleted From The Windows Firewall Configuration - Remove program files filter to increase coverage. As deleting rules shouldn't be a "normal" behavior.
update: CreateRemoteThread API and LoadLibrary - Reduce level to medium and convert to a TH rule
update: New Firewall Rule Added In Windows Firewall Exception List For Potential Suspicious Application - Add additional paths to increase coverage
update: Powershell Install a DLL in System Directory - enhance rule context in big script blocks
update: Remote Thread Creation By Uncommon Source Image - Reduced level to medium and move high indicators to 02d1d718-dd13-41af-989d-ea85c7fab93f
---------
Co-authored-by: nasbench <8741929+nasbench@users.noreply.github.com>
fix: Access To Windows Credential History File By Uncommon Application - Enhance FP filters
fix: Access To Windows DPAPI Master Keys By Uncommon Application - Enhance FP filters
fix: Amsi.DLL Load By Uncommon Process - Moved to threat hunting folder and update false positive filters to remove hardcoded C:
fix: Bad Opsec Defaults Sacrificial Processes With Improper Arguments - Typo in condition
fix: Credential Manager Access By Uncommon Application - Enhance FP filters
fix: Elevated System Shell Spawned From Uncommon Parent Location - Enhance FP filters
fix: Execution of Suspicious File Type Extension - Add new extensions to reduce FP
fix: Important Windows Eventlog Cleared - Update selection to remove "Application" log as it was generating a lot of FP in some environments
fix: Malicious PowerShell Commandlets - ScriptBlock - Remove some part of the selection due to FP matches as they were generic cmdlet names
fix: Potential Direct Syscall of NtOpenProcess - Add "Adobe" filter
fix: Potential Shim Database Persistence via Sdbinst.EXE - Update FP filter for "iisexpressshim" sdb
fix: Potentially Suspicious AccessMask Requested From LSASS - Add new FP filter for "procmon" process
fix: PowerView PowerShell Cmdlets - ScriptBlock - Remove some part of the selection due to FP matches as they were generic cmdlet names
fix: PSScriptPolicyTest Creation By Uncommon Process - Add new filter for "sdiagnhost"
fix: Relevant Anti-Virus Signature Keywords In Application Log - Update false positive filters
fix: Remote Access Tool Services Have Been Installed - Security - Fix typo in field name
fix: Suspicious File Creation Activity From Fake Recycle.Bin Folder - Remove RECYCLE.BIN\ as it was added as a typo and is a legitimate location.
fix: Uncommon Child Process Of Conhost.EXE - Add new FP filters
fix: Uncommon File Created In Office Startup Folder - Add new extension to filter out FP generated with MS Access databases
fix: Uncommon PowerShell Hosts - Moved to threat hunting folder and updated false positive filter list
fix: Use Of Remove-Item to Delete File - ScriptBlock - Moved to threat hunting folder and Update logic to be more accurate
fix: User with Privileges Logon - Move to placeholder rules and update the FP filter to account for different workstations
fix: Windows Event Auditing Disabled - Enhance list of false positive filters with additional GUID
fix: WMI Module Loaded By Uncommon Process - Moved to threat hunting folder and update and restructure false positive filters
new: Communication To Uncommon Destination Ports
new: Potentially Suspicious Execution Of Regasm/Regsvcs With Uncommon Extension
remove: Credential Dumping Tools Service Execution
remove: New Service Uses Double Ampersand in Path
remove: Powershell File and Directory Discovery
remove: PowerShell Scripts Run by a Services
remove: Security Event Log Cleared
remove: Suspicious Get-WmiObject
remove: Windows Defender Threat Detection Disabled
update: Access To Browser Credential Files By Uncommon Application - Increase level to medium and enhance filters and selections
update: Add Potential Suspicious New Download Source To Winget - Reduce level to medium
update: ADFS Database Named Pipe Connection By Uncommon Tool - Enhance coverage by improving paths selection
update: CodeIntegrity - Unmet Signing Level Requirements By File Under Validation - Reduce level to low
update: Copy From Or To Admin Share Or Sysvol Folder - Enhance selection to be more accurate
update: Eventlog Cleared - Update FP filter to remove "Application" log and increase coverage
update: Failed Code Integrity Checks - Reduce level to informational
update: HH.EXE Execution - Reduce level to low
update: Locked Workstation - Reduce level to informational
update: Malicious Driver Load By Name - Increase coverage based on LOLDrivers data
update: Meterpreter or Cobalt Strike Getsystem Service Installation - Security - Reduce level to high and restructure selections
update: Meterpreter or Cobalt Strike Getsystem Service Installation - System - Reduce level to high and restructure selections
update: Potential Credential Dumping Activity Via LSASS - Reduce level to medium and comment out noisy access masks
update: Potential PowerShell Execution Policy Tampering - Remove "RemoteSigned" as it doesn't fit with the current logic
update: Potentially Suspicious Execution Of Regasm/Regsvcs From Uncommon Location - Reduce level to medium and update logic
update: Potentially Suspicious Malware Callback Communication - Increase coverage by adding new additional ports
update: PUA - Nmap/Zenmap Execution - Reduce level to medium
update: PUA - Process Hacker Execution - Reduce level to medium
update: PUA - Radmin Viewer Utility Execution - Reduce level to medium
update: Rundll32 Execution With Uncommon DLL Extension - Enhance DLL extension list
update: SASS Access From Non System Account - Reduce level to medium and enhance false positive filters
update: Suspicious Executable File Creation - Enhance coverage by removing hardocded "C:"
update: Suspicious Program Location with Network Connections - Increase accuracy by enhancing the selection to focus on the start of the folder and partition
update: Suspicious Schtasks From Env Var Folder - Reduce level to medium
update: Suspicious Shim Database Patching Activity - Add new processes to increase coverage
update: Uncommon Extension Shim Database Installation Via Sdbinst.EXE - Reduce level to medium
update: Whoami Utility Execution - Reduce level to low
update: Whoami.EXE Execution With Output Option - Reduce level to medium
update: Windows Defender Malware Detection History Deletion - Reduce level to informational
update: WMI Event Consumer Created Named Pipe - Reduce leve to medium
---------
Co-authored-by: phantinuss <79651203+phantinuss@users.noreply.github.com>
Thanks: @Blackmore-Robert
Thanks: @swachchhanda000
Thanks: @celalettin-turgut
Thanks: @AaronS97
new: DLL Names Used By SVR For GraphicalProton Backdoor
new: Enable LM Hash Storage
new: Enable LM Hash Storage - ProcCreation
new: Scheduled Tasks Names Used By SVR For GraphicalProton Backdoor
new: Scheduled Tasks Names Used By SVR For GraphicalProton Backdoor - Task Scheduler
update: Compress-Archive Cmdlet Execution - Reudced Level to low and moved to Threat Hunting folder.
update: Disabled Volume Snapshots - Update logic by removing the reg string to also account for potential renamed executions
update: Folder Compress To Potentially Suspicious Output Via Compress-Archive Cmdlet - Update logic to be more specific
update: Potential Recon Activity Via Nltest.EXE - Add dnsgetdc coverage and enhance logic by removing /
update: Potential System DLL Sideloading From Non System Locations - Enhance logic by removing hardcoded C: value to account for other potential system locations
update: RestrictedAdminMode Registry Value Tampering - ProcCreation - Update logic the logic to not care about the data. As this registry value has use cases either be it "0" or "1"
update: RestrictedAdminMode Registry Value Tampering - Update logic the logic to not care about the data. As this registry value has use cases either be it "0" or "1"
update: Write Protect For Storage Disabled - Update logic by removing the reg string to also account for potential renamed executions
update: Zip A Folder With PowerShell For Staging In Temp - PowerShell Module - Update logic to be more specific
update: Zip A Folder With PowerShell For Staging In Temp - PowerShell - Update logic to be more specific
update: Zip A Folder With PowerShell For Staging In Temp - PowerShell Script - Update logic to be more specific
---------
Co-authored-by: phantinuss <79651203+phantinuss@users.noreply.github.com>
update: Registry Persistence via Service in Safe Mode - Fix typo in title
chore: Fix multiple typo in metadata fields and comments
---------
Co-authored-by: Nasreddine Bencherchali <8741929+nasbench@users.noreply.github.com>
Swachchhanda Shrawan Poudel