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46 lines
933 B
46 lines
933 B
7 years ago
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#!/bin/bash
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here=$(dirname "$0")
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test -n "$here" -a -d "$here" || exit
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cd $here
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if ! which osslsigncode > /dev/null 2>&1; then
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echo "Please install osslsigncode"
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fi
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if [ $# -neq 2 ]; then
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echo "Usage: $0 signed_binary unsigned_binary"
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fi
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out="$1-stripped.exe"
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set -ex
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echo "Step 1: Remove PE signature from signed binary"
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osslsigncode remove-signature -in $1 -out $out
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echo "Step 2: Remove checksum from signed binary"
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python3 <<EOF
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pe_file = "$out"
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with open(pe_file, "rb") as f:
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binary = bytearray(f.read())
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pe_offset = int.from_bytes(binary[0x3c:0x3c+4], byteorder="little")
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checksum_offset = pe_offset + 88
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for b in range(4):
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binary[checksum_offset + b] = 0
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with open(pe_file, "wb") as f:
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f.write(binary)
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EOF
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bytes=$( wc -c < $2 )
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bytes=$((8 - ($bytes%8)))
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bytes=$(($bytes % 8))
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echo "Step 3: Appending $bytes null bytes to unsigned binary"
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truncate -s +$bytes $2
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diff $out $2 && echo "Success!"
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