Expand.exe

Commands

1. DownloadUser T1105

   Use to copies the source file to the destination file

   expand {PATH_SMB:.bat} {PATH_ABSOLUTE:.bat}

   Copies source file to destination.

   os: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11

2. CopyUser T1105

   Copies files from A to B

   expand {PATH_ABSOLUTE:.source.ext} {PATH_ABSOLUTE:.dest.ext}

   Copies source file to destination.

   os: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11

3. ADSUser T1564.004

   Copies files from A to B

   expand {PATH_SMB:.bat} {PATH_ABSOLUTE}:file.bat

   Copies source file to destination Alternate Data Stream (ADS)

   os: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11

Detection

• Sigma https://github.com/SigmaHQ/sigma/blob/c04bef2fbbe8beff6c7620d5d7ea6872dbe7acba/rules/windows/process_creation/proc_creation_win_expand_cabinet_files.yml
• Elastic https://github.com/elastic/detection-rules/blob/12577f7380f324fcee06dab3218582f4a11833e7/rules/windows/defense_evasion_misc_lolbin_connecting_to_the_internet.toml

Resources

• https://twitter.com/infosecn1nja/status/986628482858807297
• https://twitter.com/Oddvarmoe/status/986709068759949319