Rebels Contest Cracking

1500$ price

Hello Folks! This is a easy write-up for find the flag of the Rebels contest!

We have a file, this file is given from Redd https://twitter.com/Reddbynight and this file contain:

$> cat /trash/system
f0VMRgEBAQAAAAAAAAAAAAIAAwABAAAAXBEQADQAAADUIQAAAAAAADQAIAACACgABwAGAAEAAACAAAAA
AAAQAAAAEAAUIQAAgG8AAAcAAABAAAAAUeV0ZAAAAAAAAAAAAAAAAAAAAAAAAAAABwAAABAAAAAAAAAA
AAAAAAAAAACNTCQEg+Tw/3H8VYnlUYPsBMcFgCEQAAAvEADoFwAAAOigAgAA6JYFAAD76GQLAADo0g4A
AOv+VYnlg+wQxgVWLxAAB8dF/AAAAADrI6EAIBAAi1X8AdIB0A+2FVYvEAAPttLB4giDyiBmiRCDRfwB
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EAAPtgVVLxAAD7bQidDB4AIB0MHgBInCD7YFVC8QAA+2wAHQAcAByIlF+ItF+A+3Vf5miRDpjwAAAIB9
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icIPtgVULxAAD7bAAdABwAHIiUX4Zg++VewPt0X+CdCJwotF+GaJEA+2BVQvEACDwAGiVC8QAOsYgH3s
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g+wIZscFcCEQAC8AuEAhEACjciEQAIPsBGowagBoQCEQAOj+BgAAg8QQg+wMagBqAGoAagBqAOgk////
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aKEAAADo3vz//4PEEIPsCGoBaiHoz/z//4PEEIPsCGoBaKEAAADovfz//4PEEIPsCGj9AAAAaiHoq/z/
/4PEEIPsCGj/AAAAaKEAAADolvz//4PEELi2ERAAaI4AAABqCFBqAOid/P//g8QQuMcREABojgAAAGoI
UGoB6Ib8//+DxBC42BEQAGiOAAAAaghQagLob/z//4PEELjpERAAaI4AAABqCFBqA+hY/P//g8QQuPoR
EABojgAAAGoIUGoE6EH8//+DxBC4CxIQAGiOAAAAaghQagXoKvz//4PEELgfEhAAaI4AAABqCFBqBugT
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AABqCFBqCejO+///g8QQuG0SEABojgAAAGoIUGoK6Lf7//+DxBC4fxIQAGiOAAAAaghQagvooPv//4PE
ELiREhAAaI4AAABqCFBqDOiJ+///g8QQuKMSEABojgAAAGoIUGoN6HL7//+DxBC4tRIQAGiOAAAAaghQ
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0f///4PEBIhF/4B9/+B1Ew+2Rf8PtoCALhAAD77A6ScBAADHRfgBAAAAx0X0AAAAAA+2Rf+EwHkLx0X4
AAAAAIBl/38PtkX/g/gqdFSD+Cp/B4P4HXRe622D+DZ0Q4P4OnVjg334AHQVoVwvEACFwHQMxwVcLxAA
AAAAAOseg334AHQYoVwvEACFwHUPxwVcLxAAAQAAAOmkAAAA6Z8AAACDffgAD5XAD7bAo2QvEADpiwAA
AIN9+AAPlcAPtsCjaC8QAOt6oWQvEACFwHQJoVwvEACFwHQSoWQvEACFwHUQoVwvEACFwHQHx0X0AQAA
AIN9+AB1DsYFbC8QAAC4AAAAAOtFg330AHQND7ZF/w+2gAAuEADrCw+2Rf8PtoCALhAAomwvEABqZOim
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AACJwdPjidj30AnQD7bAUGihAAAA6Fv///+DxAiLXfzJw1WJ5VODfQgHdy5qIehg////g8QEicKLRQi7
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/4PECMnDVYnlg+wYx0X0AAAAAMcFdC8QAAAAAAChWC8QAIP4AXUViw10LxAAuDcTAAC6AAAAAPfxiUX0
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ABFqAFC4EQAAAOmN/v//xgXALRAAEmoAULgSAAAA6Xn+///GBcAtEAATagBQuBMAAADpZf7//8YFwC0Q
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ABdqAFC4FwAAAOkV/v//xgXALRAAGGoAULgYAAAA6QH+///GBcAtEAAZagBQuBkAAADp7f3//8YFwC0Q
ABpqAFC4GgAAAOnZ/f//xgXALRAAG2oAULgbAAAA6cX9///GBcAtEAAcagBQuBwAAADpsf3//8YFwC0Q
AB1qAFC4HQAAAOmd/f//xgXALRAAHmoAULgeAAAA6Yn9///GBcAtEAAfagBQuB8AAADpdf3//8YFwC0Q
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ACNqAFC4IwAAAOkl/f//xgXALRAAJGoAULgkAAAA6RH9///GBcAtEAAlagBQuCUAAADp/fz//8YFwC0Q
ACZqAFC4JgAAAOnp/P//xgXALRAAJ2oAULgnAAAA6dX8///GBcAtEAAoagBQuCgAAADpwfz//8YFwC0Q
AClqAFC4KQAAAOmt/P//xgXALRAAKmoAULgqAAAA6Zn8///GBcAtEAAragBQuCsAAADphfz//8YFwC0Q
ACxqAFC4LAAAAOlx/P//xgXALRAALWoAULgtAAAA6V38///GBcAtEAAuagBQuC4AAADpSfz//8YFwC0Q
AC9qAFC4LwAAAOk1/P//ZmFpbHtVX2Y0MWxfaDRyRCFUX1R9CgAAABQAAAAAAAAAAXpSAAF8CAEbDAQE
iAEAACAAAAAcAAAAbOr//zcAAAAARAwBAEcQBQJ1AEMPA3V8BgAAABwAAABAAAAAf+r//1IAAAAAQQ4I
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AEEOCIUCQg0FQYMDAm3FwwwEBAAgAAAA/AIAAFr3//9yAAAAAEEOCIUCQg0FQYMDAm3FwwwEBAAcAAAA
IAMAAKj3//8mAAAAAEEOCIUCQg0FYsUMBAQAABgAAABAAwAArvf//+kAAAAAQQ4IhQJCDQUAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACACwDc1tvdmtPJgJoAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAjAAAABQAAAC4AAAAlAAAA
BAAAABMAAAAsAAAADAAAABMAAAAWAAAAJgAAACYAAAAsAAAADAAAACAAAAAFAAAAEQAAABgAAAATAAAA
JgAAACAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA4AAABVAAAA
CgAAAAcAAABIAAAAMAAAAEoAAABCAAAABgAAABwAAAACAAAACwAAACUAAAAcAAAAFwAAAGsAAABEAAAA
WwAAAAgAAAA1AAAAGQAAAEdDQzogKEdOVSkgNC45LjIAAC5zaHN0cnRhYgAudGV4dAAuZWhfZnJhbWUA
LmRhdGEALmJzcwAuY29tbWVudAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
CwAAAAEAAAAGAAAAAAAQAIAAAAByFQAAAAAAAAAAAAAQAAAAAAAAABEAAAABAAAAAgAAAHQVEAD0FQAA
WAMAAAAAAAAAAAAABAAAAAAAAAAbAAAAAQAAAAMAAAAAIBAAgCAAABQBAAAAAAAAAAAAAEAAAAAAAAAA
IQAAAAgAAAADAAAAQCEQAJQhAABATgAAAAAAAAAAAABAAAAAAAAAACYAAAABAAAAMAAAAAAAAACUIQAA
EQAAAAAAAAAAAAAAAQAAAAEAAAABAAAAAwAAAAAAAAAAAAAApSEAAC8AAAAAAAAAAAAAAAEAAAAAAAAA

Now you will take the only the hash and if you have a linux you can start pressing:

echo "hash-here" | tee hash.txt

Now you will have the content in hash.txt but we don’t know what type of file it is! So now let’s try to decode it.

cat hash.txt | base64 --decode

This is the output:

Now we can find that is a file compiled by GCC so is .C file , now we can put this file in another file called hex

cat hash.txt | base64 --decode > hex

Now we can see what type of file it is:

NICE!! It’s an ELF 32-bit file and it’s seems to be executable, now we need extract the right part of this file using xxd or other tool and we can see:

Now we can extract the HEX code and decode it. The HEX code is:

66 61 69 6C 7B 55 5F 66 34 31 6C 5F 68 34 72 44 21 54 5F 54 7D

Now go on hex decoder online

And we have found the final flag!

FLAG: fail{U_f41l_h4rD!T_T}

Hope is useful

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