Flag: Tornado! Hurricane!


Packer Name Packer Author Classification Analysis By Last Updated
UPX Markus & Laszlo Compressor quig July 17 2005
Allocation Anti-Debug Anti-Disassembly Section Name Sample
PE Header (UPX 0) no no UPX0, UPX1 N/A
Notes
IAT built at runtime Dlls loaded by loader one api entry per dll left

Transfer Command
61               POPAD
E9 [4Bytes]      JMP [offset]
Entry Point Signature
60                PUSHAD
BE   [4 Bytes]    MOV ESI[Value]
8DBE [4 bytes]    LEA EDI, DWORD PTR DS:[ESI+Value]
57                PUSH EDI
83CD FF           OR EBP, FFFFFFFF
EB 10             JMP SHORT [Relative Jump]
90                NOP
90                NOP
90                NOP
90                NOP
90                NOP
90                NOP
Known Unpackers
http://www.mycgiserver.com/~bratalarm/  - Good generic unpacker

------------------------------------------------------
//OllyScript Oep finder by shag
// The amazing UPX OEP finder v2
// This script will quickly put you at the OEP of an UPX-packed EXE.
// Just run it!
// Implemented using hardware breakpoints (just for fun).

eob Break 
findop eip, #61#
bphws $RESULT, "x"
run

Break:
sto 
sto
bphwc $RESULT
ret

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