Follina CVE-2022-30190 Detection with THOR and Aurora

The Follina 0day vulnerability (CVE-2022-30190) in Microsoft Windows is actively exploited in-the-wild and highly critical. This blog posts lists some important web resources and the signatures that detect exploitation attempts.

Kevin Beaumont's Blog Post

Kevin’s post contains links to tweets of researchers that discovered the 0day exploit, information on the timeline, and mitigations

Huntress Labs Blog Post

Explains the exploit in more detail

Counter Measures

Recommended counter measures by Benjamin Deplhy

Signatures Detecting Follina / CVE-2022-30190 Attacks

Check for matches with the following rules:

YARA

Rules shared in the public signature-base and used in THOR and THOR Lite

Only available in THOR

Sigma

Public Sigma rules used in Aurora, THOR and Aurora Lite

Private Sigma rules only available in Aurora

  • Sdiagnhost Loading System.Management.Automation.dll – 1a4a0e9c-e47d-492c-800f-545f83fac88a
  • Sdiagnhost Calling Suspicious Descendant Process – 8655fa4b-e956-4ed4-b20d-151dfd8c802d

ASGARD v2.13 Release

Over the last 4 months, we’ve worked on many new UX improvements and the integration of our endpoint agent Aurora. Today, we are glad to announce the release of ASGARD version 2.13. 

UX Improvements

We’ve reworked many sections and dialogues with user experience (UX) in mind. 

Overall, we’ve made more than 260 changes, reworked complete sections and dialogues and added completely new functions like the new “diagnostics”. 

Some of highlights:

  • Each THOR scan now shows a progress bar that doesn’t only show the state of completion but also the current module and element, the module progress and the amount of time spent on this module. This can help you to identify bottlenecks, issues or elements that should better be excluded from the scan.
  • All tables now have an option for an auto-refresh, which can be set per user and table (persistent setting by user)
  • The new diagnostics section helps you to quickly identify connectivity or configuration issues
  • Export and Import of Scan Templates
  • Reworked THOR download section, which allows to generate links for the “latest available version” and shows an information on the API endpoint usage
  • Improved agent installer repackaging options (e.g. repack all outdated installers)
  • Many dialogues with additional error handling of common user errors

Some of the planned UX improvements are still on the roadmap and will be part of the next update. These include: 

  • More flexible group scan target selection (combine labels with AND instead of OR, filter selection for labels to exclude)
  • Maintenance section in which users can define clean-up rules for old data (remove old assets, automatically remove old log data etc.)

 

 

Scan Progress Bar (Single Scan)

Scan Progress Bar (Group Scan; Collapsed Info)

Auto Refresh Options

System Diagnostics

Background Load Indicators (green line)

Export & Import of Scan Templates

Reworked THOR Download Section (generate link for the latest version, information about the use of the tokens)

Improved Agent Installer Repackaging Options

Aurora Agent Support

This version allows the deployment and management of our Sigma-based endpoint agent.

You can find information about Aurora here.

ASGARD Management Center allows you to:

  • Manage rules that you want to use
  • Add false positive filters to rules
  • Define response actions for certain rules
  • Manage updates on these rules
  • Group rules into rule sets
  • Use rule sets in an Aurora configurations
  • Assign configurations to groups of end systems
  • Put all response actions in a configuration into simulation mode
  • Put single response actions in simulation mode
  • Manage rules that have been in simulation mode for a certain time
  • Apply so-called response sets (groups of response actions provided by Nextron) to your rule set
  • Apply your IOCs or IOCs retrieved from a MISP instance with Aurora

Aurora Agents (Deployed)

Sigma Rule Set Management

Aurora Agent Configurations

More changes in this release

  • AIX support (beta users only)
  • Collect THOR log as JSON (optional)
  • New section “Playbook Files” to manage all files and tools used in playbooks
  • License expiration warning messages
  • many more – see the changelog for all details

Upgrade

ASGARD Management Center customers upgrade their instances in “Updates > Management Center”. 
Important: Make sure to upgrade Master ASGARD instances before upgrading the connected ASGARDs. 

Aurora Lite Agent v1.0 Release

After almost half a year of development, we are pleased to announce the release of our free version of the Aurora Agent named Aurora Lite.

The Aurora agent is a Sigma-based endpoint agent that offers maximum transparency, flexibility, and confidentiality. It doesn’t require an additional kernel driver but uses the native Event Tracing for Windows (ETW). Other detection modules like the “Cobalt Strike Beaconing Detector” or the “LSASS Dump Detector” provide detection capabilities that exceed the scope of pure Sigma matching. 

Aurora Lite is a limited but free version of the endpoint agent. It lacks some features, has no additional detection modules, and cannot be used with the comfortable ruleset and configuration management in ASGARD Management Center. The complete list of limitations can be found here.

Regardless of these limitations, we believe that even the free version can compete with other commercial endpoint agents and provides similar detection coverage. 

Captured Pre-Release Web Session

Slide Deck

The slide deck shown in the recorded web session can be found here.

Slides 8 to 18 contain a quick start guide.

Online Manual

The Aurora Agent online manual can be found under this link.

Product Page and Download

You can find the Aurora Agent product page and the download links here.

Antivirus Event Analysis Cheat Sheet v1.9.0

We’ve updated our Antivirus Event Analysis Cheat Sheet to version 1.9.0. 

  • It includes updates in almost all sections
  • add special indicators for all kinds of Microsoft Exchange exploitation activity (ProxyLogon, ProxyShell etc.)
  • moves Ransomware indicators to highly relevant column

You can download the new version here.

Tip: to always find the newest version of the cheat sheet, use this search query.

ASGARD v2.12 Released

The new ASGARD Management Center version 2.12 adds new features and fixes several issues that were introduced with the version 2.11 in December last year.

Better Sigma Rule Management

We’ve added new features and improved the usability of the sigma rule management section, which is relevant for the released LogWatcher agent and beta customers testing our new Aurora agent.

 The most important new features are the false positive and response editor, which allows Aurora customers to configure response actions for a triggering rule. 

The false positive filter enables users to add filters that, instead of changing the  original rule, extend it during deployment. This makes it easy to use updated rules with the same custom filter values that are only relevant in the user’s environment. 

Revised Updates Section

The update section for the scanners and signatures has been revised. Each action has been reworked. Users can now trigger and update manually and check the log of the update process in a separate tab. 

Full change log:

– Feature: Support Aurora Agent (Beta Only)
– Feature: Manage Sigma Responses and False Positives (Aurora Only)
– Feature: Enable / Disable Sigma Rules
– Feature: Manually check for THOR and Signature Updates
– Feature: Show log of previous update process
– Feature: Auto Config for Sigma Rulesets (Automatically add new Sigma Rules based on level)
– Feature: The UI now has a lot more indicators for e.g. ‘Asset Requests’, ‘Uncompiled Rulesets’ and more
– Feature: Added more graphs to overview page, e.g. incoming Aurora and Log Watcher events
– Feature: Added bulk update for available Sigma rule updates
– Feature: Added default Sigma Rulesets (if no ruleset has been created yet)
– Feature: Added background routine that removes older and unused THOR / Signature versions
– Feature: Edit Scan Templates
– Feature: Search THOR Flags / Aurora Options
– Feature: Download THOR Zip with target hostname as filename
– Change: Improved Server Status indicators
– Change: Improved licensing
– Change: LDAP users require at least one LDAP role, otherwise they are not authenticated anymore
– Change: Updated Sigma rules
– Change: Cosmetics and UX improvements
– Change: Updated default THOR and Signature auto-update config
– Change: Added more links and password reset help to login page
– Change: Improved usability and feedback in IOC Management section
– Change: Require current password for password change
– Bugfix: Re-added and improved “no labels” filter in assets table
– Bugfix: Re-added resize buttons for Remote Console
– Bugfix: Fixed an issue that causes some API keys to be corrupt
– Bugfix: Fixed non-working ‘Install Service Controller’ playbook on Master ASGARD
– Bugfix: Updated interrogate job to detect ‘Windows 11’ correctly
– Bugfix: Fixed corrupt ‘Is Domain Controller: No’ filter
– Bugfix: Fixed missing default value when editing Sigma or YARA rules in IOC Management
– Bugfix: Fixed non-working “use newer Sigma rule” button
– Bugfix: Fixed CRLF issues in IOC Management for some IOC types
– Bugfix: Fixed some missing MISP iocs in THOR download package
– Bugfix: Fixed permissions on some files that caused backup process of ASGARD config files on Master ASGARD to not work properly
– Bugfix: Fixed encryption issues with custom signatures for THOR Lite
– Bugfix: Fixed missing import in ntp config that causes ntp to not work properly on some ASGARDs
– Bugfix: Fixed tasks that are pending forever due to unknown task module
– Bugfix: Fixed non-working rsyslog reload after monthly logrotation
– Bugfix: Fixed wrong file extension of stdout and stderr file in group task result package

To install the update, visit the “Updates > Management Center” section. 

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