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I've had two BashBunny payloads fail on me (USB_File_Exfiltration and SmartFileExtract_Exfiltration) when I ran them in the morning, after working on them for a full day trying to get them to work (the night before). Debugging the scripts on Windows, I found out that the date/time stamp formatting for the filename was causing the issue. The hour is left-padded with a space in the AM. I found the following hint for creating Windows Batch Script variables that are properly formatted with the date/time. My modified code to match the format in the payload scripts is below: @echo off for /f "tokens=2 delims==" %%a in ('wmic OS Get localdatetime /value') do set "dt=%%a" set "YY=%dt:~2,2%" & set "YYYY=%dt:~0,4%" & set "MM=%dt:~4,2%" & set "DD=%dt:~6,2%" set "HH=%dt:~8,2%" & set "Min=%dt:~10,2%" & set "Sec=%dt:~12,2%" set "datestamp=%YYYY%%MM%%DD%" & set "timestamp=%HH%%Min%%Sec%" & set "fullstamp=%YYYY%%MM%%DD%_%HH%%Min%%Sec%" echo datestamp: "%datestamp%" echo timestamp: "%timestamp%" echo fullstamp: "%fullstamp%" pause Here is the output: datestamp: "20190809" timestamp: "084546" fullstamp: "20190809_084546" Press any key to continue . . . And here is the link that helped me figure it out: How do I get current datetime on the Windows command line, in a suitable format for using in a filename? I hope this helps someone avoid the struggle I've been having the last two days.