[Very Easy] PackedAway

PackedAway

6^th 03 24 / Document No. D24.102.20

Prepared By: clubby789

Challenge Author: clubby789

Difficulty: Very Easy

Classification: Official

Synopsis

PackedAway is a Very Easy reversing challenge. Players will use UPX to extract the original version of an executable.

Skills Learned

- Unpacking `UPX` executables

Solution

If we run the binary, it opens a UI containing a text box with 'Placeholder'. If we write a fake flag such as HTB{xx}, it is highlighted in red.

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If we run strings on the binary, there are no obvious secrets - but there are several 'UPX!' strings. If we use upx -d to extract the binary, we will unpack a slightly larger one. We can then run strings again, and find the flag in the output.

If we enter this in the textbox, it will be highlighted in green.

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