[MMA 2015] [Misc – MQAAAA] Write Up

Description

I0B+Xk1RQUFBQT09CVVtLmJ3RFIrMXRLY0p0SCkJRHRubTZWbFRtaEtETnxyZHtLNDZFZG1DT2JXVThyYmpSSUFBQT09XiN+QA==

Resolution

This is an obvious base64 encoded string. After decoding it, we have

#@~^MQAAAA== Um.bwDR+1tKcJtH) Dtnm6VlTmhKDN|rd{K46EdmCObWU8rbjRIAAA==^#~@

This is a VBScript encoded string. We save it in a file name encoded, then used this tool https://gist.github.com/bcse/1834878 to decode it

$ scrdec18-VC8.exe encoded decoded.txt

Let’s check decoded.txt content :

<% @Language="VBScript.Encode" %>
<%=WScript.echo("MMA{the_flag_word_is_obfuscation}")%>

We’ve got our flag !

MMA{the_flag_word_is_obfuscation}

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