Questions tagged [upx]

the Ultimate Packer for eXecutables is a free, multiplatform, open-source executables packer.

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Why does Olly 2.01 fail to break at the module EP?

I was playing around with tutorials/white papers concerning unpacking, specifically UPX. As Olly 2.01 is my debugger of choice, I attempted to unpack an UPX-packed exe with it and to my surprise, it ...
12
votes
2answers
22k views

How to prevent “upx -d” on an UPX packed executable?

I recently read a tweet from Ange about a technique to fool UPX when the option -d (decompress) is called. I would like to know how this is working and, what are the technique to prevent an UPX ...
7
votes
4answers
11k views

How to check if an ELF file is UPX packed?

I have an ELF file and want to know if it is UPX packed. How can I detect UPX compression in GNU/Linux?