Here is the output: Congratulations You are able to encrypt a command using Linux. Encode to Base64 String: mac base64 <<< Hello World - This is my String. Encode the file using the Base64.exe tool. Tutorial Linux - Encoding a command using Base64. Encode or Decode Base64 String using Mac Terminal Command 1. As the name suggests, there will be 64 characters in Base64 string. Base64 encoding and decoding is a popular method to encrypt and decrypt the data. The encoding and decoding are important in order to prevent the data from malware attacks. base64 -i INPUTFILE-o OUTPUTFILE Windows. PowerShell Base64 is a technique or mechanism that is used to encode and decode data. Encode the file using the base64 command line tool. | where string_size(CommandLine) >= 24 // get rid of CommandLine that is too short. Encode the file using the base64 command line tool, making sure to prevent line-wrapping by using the -w 0 flag. | where ParentProcessName contains or NewProcessName contains "powershell" or NewProcessName contains "pwsh" We actually found items that were double-encoded. In practice this worked and did find some "shady" items. It's not exhaustive, but essentially looks for longer command lines with a decent length of a base64 string, and it also has to be a valid string (one that can be decoded by the base64_decode() function.) Is there a better way to do this? Although this executes, Will my logic even came up with a "hedge" which is pretty good for finding base64 on the command line. We then check those elements (exhaustively) using an mv-apply against some regex for finding Base64 strings. The following command encodes and decodes on Linux from the command-line. I then use the split() function to parse up the CommandLine column into an array with each distinct element. Base64Encoding and Decoding on Linux Systems. I'm looking for EventIDs 46 in the Security Log, where we have powreshell or pwsh executed. It executes, so syntactically it works, but it is extremely inefficient. | mv-apply l=args to typeof(string) on ( where args matches regex ) | where CommandLine contains "powershell" or CommandLine contains "pwsh" So I whipped up the following query: SecurityEvent I put together a query to look for base64-encoded strings on Command Lines where powershell has been executed.
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