![]() Before malware analysis, you need to be sure if the packer is present. Many authors of malicious software use Upack to further reduce size of the exploit so it is more flexible and can fit in smaller places. See also: UPX Unpacker What are packers? Reversing Worms and Trojans Packed with Upack That is why the original file size may be increased after you open and save the executable WITHOUT making ANY changes to it in PE Explorer. PE Explorer does not re-pack the previously packed files. The resulted file will also be saved unpacked. When you open a file with PE Explorer, the Upack Unpacker plug-in detects whether the file is packed with Upack, and then your file will be unpacked automatically. This allows you to perform static analysis on the now unpacked data. The Upack Unpacker re-creates an executable file in its original form, before it was packed. ![]() Upack is a packer similar to UPX, but it uses LZMA compression and is designed with a focus on anti-unpacking. ![]() PE Explorer ships with the Upack Unpacker plug-in, a start-up processing plug-in for unpacking files compressed with Upack or WinUpack. Home products pe explorer feature tour Upack Unpacker Plug-In Automatic Upack (WinUpack) Unpacking
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