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Sajal Thomas
Vishnu Raju
ATT&CK is the Best Defense
Emulating Sophisticated Adversary Malware to Bolster Defenses
Sajal Thomas
▪ Adversary Tradecraft Research
@ CrowdStrike
▪ Former red team operator turned
researcher
▪ Connoisseur of the finest adversary
tradecraft
Introductions
VishnuRaju
▪ Adversary Emulation@ CrowdStrike
▪ Ex-red teamoperator, Ex-threat hunter
▪ Livingthe security spectrum- Red, Blue,
Purple
©2023CROWDSTRIKE, INC. ALL RIGHTSRESERVED.
Adversary Emulation is an intelligence-driven approach
to research and execute tactics, techniques and
procedures (TTPs) used by a real-world adversary known
to target an organization.
▪ Killchains contain very specific tradecraft
▪ No hypothetical scenario like Adversary Simulation
▪ Validates defences against a specific adversary
What is Adversary Emulation?
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
▪ Assessed with high confidence
to be attributable to the
Federal Security Service (FSB)
of the Russian Federation
▪ Operating for nearly 2 decades
▪ Targets gov institutes that
handle diplomatic efforts,
interior, foreign services, etc
▪ Novel and sophisticated
tradecraft
Venomous Bear aka Turla
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
▪ LightNeuron is a backdoor installed on
Exchange Servers
▪ Supports command-and-control entirely via
incoming and outgoing emails
▪ Can intercept, block or modify emails going
through the infected Exchange Server
▪ Can execute commands sent by emails in
attachments that use steganography
▪ Difficult to remediate and remove
LightNeuron/BLUEPRINT
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Our Approach to Emulation
Gather
intelligence
Extract
techniques
Analyze &
organize
Develop
tooling
2
Emulate
3 4 5
1
Research phase
Improve
Falcon
6
Fun part !
Address gaps
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Components:
▪ PowerShell script for installation
▪ Mail Transport Agent (DLL written in .NET)
▪ Companion DLL (DLL written in C++)
▪ Encrypted config file masquerading
▪ Rules file in XML
Tradecraft
https://web-assets.esetstatic.com/wls/2019/05/ESET-LightNeuron.pdf
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Components:
▪ PowerShell script for
installation
Tradecraft
https://web-assets.esetstatic.com/wls/2019/05/ESET-LightNeuron.pdf
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Components:
▪ Mail Transport Agent
Tradecraft
https://web-assets.esetstatic.com/wls/2019/05/ESET-LightNeuron.pdf
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Components:
▪ Companion DLL
Tradecraft
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Components:
▪ Config file
Tradecraft
https://web-assets.esetstatic.com/wls/2019/05/ESET-LightNeuron.pdf
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Components:
▪ Rules file in XML
Tradecraft
https://web-assets.esetstatic.com/wls/2019/05/ESET-LightNeuron.pdf
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
ATT&CK Techniques Based on Public & Private Reports
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
MITRE’s ATT&CK Techniques
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Enter - Micro Emulation Plans
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Installation:
▪ Exchange Management Shell
▪ Add-PSSnapin
Microsoft.Exchange.Management.PowerShell.SnapIn
▪ Exchange Server PowerShell through WinRM
▪ Manually modifying agents.config
Emulation
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Emulation
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
First generation Mail Transport Agent:
▪ read XML rules file from disk
▪ parsed the email
▪ if subject contained “alert”, subject
changed to “external”
Emulation
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
First generation companion DLL:
▪ used open-source AES library - crypto++
▪ hardcoded AES key and IV
▪ accepted encrypted text as argument
▪ only performed decryption
Emulation
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Second generation Mail Transport Agent:
▪ referenced the companion DLL export function
▪ read plain text attachment received via email
▪ passed it on to Companion DLL
Emulation
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Second generation companion DLL:
▪ parsed attachment
▪ decrypted encrypted payload
▪ checked for prefix
▪ command execution via C++ “system”
▪ command execution via CreateProcess
Emulation
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Third generation companion DLL:
▪ zipped sensitive files
▪ added base64 encoded zip to EML
▪ staged under Pickup folder
▪ exfiltration
Emulation
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Emulation in Action
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Emulation in Action
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Emulation in Action
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
▪ Identify modifications to agents.config file
▪ Observe anomalous process behaviour and relationships:
▪ EdgeTransport.exe spawning cmd.exe/powershell.exe
▪ Automate sandbox submission for ‘interesting’ files dropped in ‘interesting’ file paths
▪ Examine all unsigned DLLs loaded by Exchange Server (EdgeTransport.exe)
▪ Supplement XDR with Email logs to create a timeline of events:
▪ Email arrives -> EdgeTransport spawns cmd.exe -> evil happens
Detection and Response Strategy
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
▪ Highly sophisticated adversary
▪ Custom and complex malware toolkit
▪ Public intel reporting for Venomous Bear is malware-specific
▪ Few details on actual tradecraft used in intrusions
▪ Not easy to automate
Challenges Faced
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Challenges Faced
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Questions?
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
Thank You
©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.

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ATT&CK is the Best Defense - Emulating Sophisticated Adversary Malware to Bolster Defenses

  • 1. Sajal Thomas Vishnu Raju ATT&CK is the Best Defense Emulating Sophisticated Adversary Malware to Bolster Defenses
  • 2. Sajal Thomas ▪ Adversary Tradecraft Research @ CrowdStrike ▪ Former red team operator turned researcher ▪ Connoisseur of the finest adversary tradecraft Introductions VishnuRaju ▪ Adversary Emulation@ CrowdStrike ▪ Ex-red teamoperator, Ex-threat hunter ▪ Livingthe security spectrum- Red, Blue, Purple ©2023CROWDSTRIKE, INC. ALL RIGHTSRESERVED.
  • 3. Adversary Emulation is an intelligence-driven approach to research and execute tactics, techniques and procedures (TTPs) used by a real-world adversary known to target an organization. ▪ Killchains contain very specific tradecraft ▪ No hypothetical scenario like Adversary Simulation ▪ Validates defences against a specific adversary What is Adversary Emulation? ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 4. ▪ Assessed with high confidence to be attributable to the Federal Security Service (FSB) of the Russian Federation ▪ Operating for nearly 2 decades ▪ Targets gov institutes that handle diplomatic efforts, interior, foreign services, etc ▪ Novel and sophisticated tradecraft Venomous Bear aka Turla ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 5. ▪ LightNeuron is a backdoor installed on Exchange Servers ▪ Supports command-and-control entirely via incoming and outgoing emails ▪ Can intercept, block or modify emails going through the infected Exchange Server ▪ Can execute commands sent by emails in attachments that use steganography ▪ Difficult to remediate and remove LightNeuron/BLUEPRINT ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 6. Our Approach to Emulation Gather intelligence Extract techniques Analyze & organize Develop tooling 2 Emulate 3 4 5 1 Research phase Improve Falcon 6 Fun part ! Address gaps ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 7. Components: ▪ PowerShell script for installation ▪ Mail Transport Agent (DLL written in .NET) ▪ Companion DLL (DLL written in C++) ▪ Encrypted config file masquerading ▪ Rules file in XML Tradecraft https://web-assets.esetstatic.com/wls/2019/05/ESET-LightNeuron.pdf ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 8. Components: ▪ PowerShell script for installation Tradecraft https://web-assets.esetstatic.com/wls/2019/05/ESET-LightNeuron.pdf ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 9. Components: ▪ Mail Transport Agent Tradecraft https://web-assets.esetstatic.com/wls/2019/05/ESET-LightNeuron.pdf ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 10. Components: ▪ Companion DLL Tradecraft ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 12. Components: ▪ Rules file in XML Tradecraft https://web-assets.esetstatic.com/wls/2019/05/ESET-LightNeuron.pdf ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 13. ATT&CK Techniques Based on Public & Private Reports ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 14. MITRE’s ATT&CK Techniques ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 15. Enter - Micro Emulation Plans ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 16. Installation: ▪ Exchange Management Shell ▪ Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn ▪ Exchange Server PowerShell through WinRM ▪ Manually modifying agents.config Emulation ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 17. Emulation ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 18. First generation Mail Transport Agent: ▪ read XML rules file from disk ▪ parsed the email ▪ if subject contained “alert”, subject changed to “external” Emulation ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 19. First generation companion DLL: ▪ used open-source AES library - crypto++ ▪ hardcoded AES key and IV ▪ accepted encrypted text as argument ▪ only performed decryption Emulation ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 20. Second generation Mail Transport Agent: ▪ referenced the companion DLL export function ▪ read plain text attachment received via email ▪ passed it on to Companion DLL Emulation ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 21. Second generation companion DLL: ▪ parsed attachment ▪ decrypted encrypted payload ▪ checked for prefix ▪ command execution via C++ “system” ▪ command execution via CreateProcess Emulation ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 22. Third generation companion DLL: ▪ zipped sensitive files ▪ added base64 encoded zip to EML ▪ staged under Pickup folder ▪ exfiltration Emulation ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 23. Emulation in Action ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 24. Emulation in Action ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 25. Emulation in Action ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 26. ▪ Identify modifications to agents.config file ▪ Observe anomalous process behaviour and relationships: ▪ EdgeTransport.exe spawning cmd.exe/powershell.exe ▪ Automate sandbox submission for ‘interesting’ files dropped in ‘interesting’ file paths ▪ Examine all unsigned DLLs loaded by Exchange Server (EdgeTransport.exe) ▪ Supplement XDR with Email logs to create a timeline of events: ▪ Email arrives -> EdgeTransport spawns cmd.exe -> evil happens Detection and Response Strategy ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 27. ▪ Highly sophisticated adversary ▪ Custom and complex malware toolkit ▪ Public intel reporting for Venomous Bear is malware-specific ▪ Few details on actual tradecraft used in intrusions ▪ Not easy to automate Challenges Faced ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 28. Challenges Faced ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 29. Questions? ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.
  • 30. Thank You ©2023 CROWDSTRIKE, INC. ALL RIGHTS RESERVED.