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1. In PowerShell, there are very useful cmdlets that run strings as commands: Invoke-Expressions and Invoke-Command. The Invoke-Expression cmdlet evaluates or runs a specified string as a command and returns the results of the expression or command. Without Invoke-Expression, a string submitted at the command line is returned (echoed) Invoke-Command, on the other hand, runs commands on a local or remote computer and returns all output from the commands, including errors. Suppose a web C2 backdoor communicates using base64-encoded comment as follows: <-R2VOLVByb2Nlc3MK--> The victim system would request a pre-configured web page over HTTP. Write a PowerShell function that accepts the above base64 encoded string, decodes it and execute it as PowerShell command. (hint use Invoke- Expressions)

1. In PowerShell, there are very useful cmdlets that run strings as commands: Invoke-Expressions and Invoke-Command. The Invoke-Expression cmdlet evaluates or runs a specified string as a command and returns the results of the expression or command. Without Invoke-Expression, a string submitted at the command line is returned (echoed) Invoke-Command, on the other hand, runs commands on a local or remote computer and returns all output from the commands, including errors. Suppose a web C2 backdoor communicates using base64-encoded comment as follows: <-R2VOLVByb2Nlc3MK--> The victim system would request a pre-configured web page over HTTP. Write a PowerShell function that accepts the above base64 encoded string, decodes it and execute it as PowerShell command. (hint use Invoke- Expressions)

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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1. In PowerShell, there are very useful cmdlets that run strings as commands: Invoke-Expressions and Invoke-Command. The Invoke-Expression cmdlet evaluates or runs a specified string as a command and returns the results of the expression or command. Without Invoke-Expression, a string submitted at the command line is returned (echoed) Invoke-Command, on the other hand, runs commands on a local or remote computer and returns all output from the commands, including errors. Suppose a web C2 backdoor communicates using base64-encoded comment as follows: <html> <-R2VOLVByb2Nlc3MK--> </html> The victim system would request a pre-configured web page over HTTP. Write a PowerShell function that accepts the above base64 encoded string, decodes it and execute it as PowerShell command. (hint use Invoke- Expressions)
Transcribed Image Text:1. In PowerShell, there are very useful cmdlets that run strings as commands: Invoke-Expressions and Invoke-Command. The Invoke-Expression cmdlet evaluates or runs a specified string as a command and returns the results of the expression or command. Without Invoke-Expression, a string submitted at the command line is returned (echoed) Invoke-Command, on the other hand, runs commands on a local or remote computer and returns all output from the commands, including errors. Suppose a web C2 backdoor communicates using base64-encoded comment as follows: <html> <-R2VOLVByb2Nlc3MK--> </html> The victim system would request a pre-configured web page over HTTP. Write a PowerShell function that accepts the above base64 encoded string, decodes it and execute it as PowerShell command. (hint use Invoke- Expressions)
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