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Packer Name Packer Author Classification Analysis By Last Updated
UPX Redir archphase (NWC) UPX Modifier quig May 1 2005
Allocation Anti-Debug Anti-Disassembly Section Name Sample
PE Header (UPX) yes yes .nwcx (default) N/A
Notes
modifies upx packed exe

adds new section with variable section name to exe

loads register with upx stub entry point -1,
restores it with +1 then jmps to original UPX stub (unmodified)

offsets match sample

Transfer Command
jmp esi
Entry Point Signature
0040E000 > BE DFCC4000      MOV ESI,sckTool.0040CCDF ;this is entire code added
0040E005   83C6 01          ADD ESI,1
0040E008   FFE6             JMP ESI    ;esi = 40CCE0 

0040CCE0   60               PUSHAD     ;start of regular upx stub (not encrypted)
0040CCE1   BE 00A04000      MOV ESI,sckTool.0040A000
0040CCE6   8DBE 0070FFFF    LEA EDI,DWORD PTR DS:[ESI+FFFF7000]
0040CCEC   57               PUSH EDI
0040CCED   83CD FF          OR EBP,FFFFFFFF
0040CCF0   EB 10            JMP SHORT sckTool.0040CD02
0040CCF2   90               NOP
0040CCF3   90               NOP
0040CCF4   90               NOP
0040CCF5   90               NOP
0040CCF6   90               NOP
0040CCF7   90               NOP
Known Unpackers

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