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45 lines
933 B
45 lines
933 B
#!/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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