Need help on this!!!

[Nicolenss]

When I tried to run the python script and pcap file, it show AttributError: 'str' object has no attribute 'do_build' where I did installed Scapy in the VM.

The code looks like this:

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from scapy.all import * import sys   # Get input and output files from command line if len(sys.argv) < 2:         print "Usage: decodexorpayload.py [input pcap file]"         sys.exit(1)   # Assign variable names for input and output files infile = sys.argv[1]   def many_byte_xor(buf, key):     buf = bytearray(buf)     key = bytearray(key)     key_len = len(key)     for i, bufbyte in enumerate(buf):         buf[i] = bufbyte ^ key[i % key_len]     return str(buf)   def process_packets():     pkts = rdpcap(infile)     cooked=[]     for p in pkts:         # You may have to adjust the payload depth here:         # i.e. p.payload.payload.payload         pkt_payload = str(p.payload.payload)         pkt_offset = str(p.payload.payload)[:3]         if pkt_payload and pkt_offset:               pmod=p               # You may have to adjust the payload depth here:               p.payload.payload=many_byte_xor(pkt_payload, pkt_offset)               cooked.append(pmod)       wrpcap("dump.pcap", cooked)   process_packets()

[j.crater]

Please post full error traceback message in error tags. If needed, you can find help here: https://python-forum.io/misc.php?action=help&hid=25

[Nicolenss]

Error:
 Traceback (most recent call last):
File "decodexorpayload.py", line 45, in <module>
process_packets()
File "decodexorpayload.py", line 43, in <module>
wrpcap("dump.pcap", cooked)
File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3rc1.dev282-py2.7.egg/scapy/utils.py",line 847, in wrpcap
fdesc.write(pkt)
File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3rc1.dev282-py2.7.egg/scapy/utils.py",line 1301, in write
self._write_packet(p)
File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3rc1.dev282-py2.7.egg/scapy/utils.py",line 1409, in _write_packet
rawpkt = raw(packet)
File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3rc1.dev282-py2.7.egg/scapy/compat.py", line 45, in raw
return x.__bytes__()
File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3rc1.dev282-py2.7.egg/scapy/packet.py", line 477, in __bytes__
return self.build()
File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3rc1.dev282-py2.7.egg/scapy/packet.py", line 597, in build
p = self.do_build()
File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3rc1.dev282-py2.7.egg/scapy/packet.py", line 582, in do_build
pay = self.do_build_payload()
File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3rc1.dev282-py2.7.egg/scapy/packet.py, line 569, in do_build_payload
return self.payload.do_build()
AttributeError: 'str' object has no attribute 'do_build'