Change burp suite splash screen

patch_splash.py

# ref: https://bugbounty.zip/Share/burp-splash-prompts.html

import struct
import os

assert os.path.exists('BurpSuite.exe.bak'), 'Make backup first, want BurpSuite.exe.bak'

with open('BurpSuite.exe', 'rb') as f:
    burp_exe = f.read()

offset = 0
while True:
    offset = burp_exe.find(bytes.fromhex('89504E470D0A1A0A'), offset)
    data = burp_exe[offset:]
    assert len(data) > 0, 'Splash offset not found'
    width, height = struct.unpack('>II', data[16:24])
    print(width, height)
    if width == 912 and height == 510:
        break
    offset += 8

print('[+] splash offset:', offset)

with open('splash.png', 'rb') as f:
    splash_png = f.read()

slot_sz = 186864
splash_sz = len(splash_png)
assert splash_sz < slot_sz, 'Splash too big'

padding = b'\x00' * (slot_sz - splash_sz)
with open('original.png', 'wb') as f:
    f.write(burp_exe[offset:offset+splash_sz])
patched_burp_exe = burp_exe[:offset] + splash_png + padding + burp_exe[offset+slot_sz:]
assert len(patched_burp_exe) == len(burp_exe)

with open('BurpSuite.exe', 'wb') as f:
    f.write(patched_burp_exe)

print('[+] Patched BurpSuite.exe')