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Files from Royce Davis

Email addressrdavis at accuvant.com
First Active2013-07-13
Last Active2013-07-13
Microsoft Windows Authenticated Powershell Command Execution
Posted Jul 13, 2013
Authored by RageLtMan, Royce Davis | Site metasploit.com

This Metasploit module uses a valid administrator username and password to execute a powershell payload using a similar technique to the "psexec" utility provided by SysInternals. The payload is encoded in base64 and executed from the commandline using the -encodedcommand flag. Using this method, the payload is never written to disk, and given that each payload is unique, is less prone to signature based detection. Since executing shellcode in .NET requires the use of system resources from unmanaged memory space, the .NET (PSH) architecture must match that of the payload. Lastly, a persist option is provided to execute the payload in a while loop in order to maintain a form of persistence. In the event of a sandbox observing PSH execution, a delay and other obfuscation may be added to avoid detection. In order to avoid interactive process notifications for the current user, the psh payload has been reduced in size and wrapped in a powershell invocation which hides the process entirely.

tags | exploit, shellcode
advisories | CVE-1999-0504, OSVDB-3106
SHA-256 | b0c0d56f17bcccf9a854df5ee2b60da13d6ac2e471086b300b676e73683ee4ec
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